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发布网友 发布时间：2022-04-23 04:00

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热心网友 时间：2023-10-14 03:08

In the composition of the two-phase composite materials, in general there will always be a solution or melt-phase flow in a state of contact with another solid phase, and then curing reaction of combining the two together, in this process, both the role and mechanism of phase has been is a concern, but so far not fully understood. The results from the study have been summarized in the following theory, including the infiltration of adsorption theory, the chemical bond theory, diffusion theory, the electronic electrostatic theory, the weak boundary layer theory and the mechanical link theory, deformation theory and the priority layer adsorption theory. Each theory has its own basis, but also the existence of their own can not explain the experimental facts. In some cases, the same question, two theories that run counter to the view that, sometimes you need several applications to a general theory of the joint fact that all the experiments.
1. Infiltration adsorption theory
The theory believes that the role of polymer adhesive can be divided into two phases. The first phase: polymer molecules through the use of macro-Brownian motion from the solution or melt, the move to the surface to be sticky; through the micro-Brownian motion, macromolecular chain graally stick to the surface near the polar group. No solvent, the macromolecular chain can only partially around the surface, while under pressure or heat to rece viscosity so that they can rely on and very near the surface. Phase II: Adsorption occurred. When Myxosoma spacing and adhesive molecules <5Å, the role of van der Waals force began to form the dipole - dipole bond, dipole - inced dipole bond, hydrogen bond and so on. This theory suggests that our decision adhesive bond strength at the meeting, on the basis that: (1) with a bonding adhesive can be a variety of different materials; (2) the general viscosity adhesive with a large body of inert, and they chemical effect is small.
Bancroft noted that: The body of the sticky adhesive more strongly adsorbed, the higher bond strength. Infiltration of the view that: to save the base physical spreading in the fiber, the surface tension of the matrix must be less than the reinforced material, or coupling agent treatment, the critical surface tension. Information has been pointed out that the bisphenol A epoxy resin for the surface tension of 42.5 × 10-5N / m, polyester resin for 35 × 10-5N / m, so the critical requirements of glass fiber epoxy resin surface tension of at least 42.5 × 10-5N / m and above, the polyester should be 35 × 10-5N / m and above, or in the interface will cause the gap. This theory proved in practice is not the case, but the basic bonding requirements are achieved, further improvements in performance, should be to improve the matrix of the infiltration of the filler, and the limitations of the adsorption theory is: a test showed that the polymer film spin-off need energy 104-108erg/cm2, which greatly exceeds the intermolecular forces to overcome the energy required, indicating that the interface not only the role of intermolecular forces; b experimental results show that reactive bonding adhesive layer decided to spin-off speed, but the strength of intermolecular forces should not depend on the bonding surface of the separation of the two speeds, so bonding is not only a decision by the intermolecular forces; c the theory is adhesive bonding with the polar group precursor interaction-based, so it can not explain why the non-polar polymer adhesive force between the will.
2. Chemical bond theory
Bjorksten and in 1949 made Lyaeger chemical bond theory. The theory of the major viewpoints of the molecular coupling agent should contain at least two functional groups, the first functional group may be in theory, enhance the material from a chemical reaction, the second functional group in theory should be able to participate in the curing reaction resin, and resin molecular chain combined with the formation of chemical bonds, therefore, coupling elements such as "Bridge", will enhance the material and the substrate through the covalent bond linking the firm. For example, the use of methyl trichlorosilane, dimethyl dichlorosilane, ethyl trichlorosilane and vinyl alkoxy silanes and alkoxy silanes Diallyldimethylammonium on unsaturated polyester / glass fiber system. The results show that unsaturated containing silane-based procts than the saturation intensity is almost twice higher than the base, a significant improvement in the resin / glass fiber interface bonding phase II. The theory for many, although not the use of coupling agent or coupling agent used but can not form a chemical bond theory of complex systems, it is powerless.
3. Diffusion Theory
Barodkuu made of polymer - polymer adhesive role in the proliferation of theories, the main point is: the role of bonding between the polymer and its role in self-adhesive (with the proliferation of types of molecules), the polymer molecule is section of chain and chain diffusion (different types of molecules) caused by, resulting from this strong adhesive force. The theory is based on the starting point of the most fundamental characteristics of polymers: macromolecular chain structure and flexibility.
Two-phase diffusion of polymer molecules actually dissolve each other, mutual dissolution of the size of the capacity of the decision by the solubility parameters, solubility parameters for the more similar the two immiscible easier. The use of coupling agents to make this theory in the field of fiber composite materials are applied.

热心网友 时间：2023-10-14 03:09

我在有道桌面字典翻译的：
In two phases consisting of composite materials, always have a photograph to melt flow state liquid or solid phase contact with another, then curing reaction to combine together, both in this process, the function and mechanism of the two alternate with is always people concern, but it is not entirely clear. The research results from existing for several theories, including chemical adsorption theory, the theory of infiltration, and the diffusion theory, electronic electrostatic theory, weak boundary theory and mechanical coupling theory, the deformation theory and the theory of absorption layer priority. A theory has its own existence, but also according to oneself cannot explain the fact. Sometimes, the two theories on the same problem is opposite, sometimes need several theory combined application to summarize all the experimental facts.
1 infiltrating adsorption theory
The theory is that the bonding, polymer can be divided into two phases. First stage: polymer molecules using macro Brownian motion from the solution of melting, or move to sticking surface, Through the micro Brownian motion, chain molecules are graally to stick surface polargroup near. No solvents, chain molecules only local close to the surface, and under pressure or heating that can be reced, viscosity and surface by very near. The second stage: adsorption effect. When he was stuck and adhesive molecular spacing < 5A, van der Waals force begin to occur, thus forming the dipole-dipole keys, dipole inction - dipole, the hydrogen bonding, etc. The theory is that stick relay decided to combine, The Times are: (1) the same kind of adhesive bonding various materials can be, (2) general adhesive and inert, gluing body chemistry between them.
Bancroft pointed out: the strong adsorption of adhesive bonding strength, high. Invasive belief: to make matrix can be spread in the fiber, the surface tension of substrate material must be less than or by coupling agent of critical surface tension. The data that bisphenol A surface tension of epoxy resin for 4.25 (10-5N/m, polyester resin for 10-35 5N/m, so the requirement of glass fiber surface tension of critical of epoxy resin is at least 10-4.25 5N/m above, polyester in 35 x 10-5N/m above, otherwise would cause in the interface void. This theory in practice, but not so prove in basic adhesive requirements, and further improve the performance, after improvement should be in the matrix of filler invasive, adsorption theory is a limitation, polymer film experiments showed that needed energy of 108erg/cm2, 104 - more than that between molecules needed to force the energy, which indicates that the interface between the molecules of not only; B experiments show adhesive power depends on the speed of adhesive layer stripping, but between the molecules of weak should not depend on two separate speed on the surface of the adhesive bonding, so not only decided by molecular force, C this theory is adhesive bonding and the polar groups based on the interaction of, so it cannot explain why the polarity between polymer will stick relay.
2 bonds theory
In 1949 Lyaeger and put forward Bjorksten chemical theory. The theory of the main ideas, coupling agent should contain at least two groups, the first kind of functional material and in theory can react in theory, the second groups can be in the curing reaction, and resin bond formation with chain resin, coupling agent, and molecular like "bridge", will be enhanced by a single firm base material and the connected together. For example, using methylerichlorosilane and methy1dichlorosi1ane and ethyl trichloramine silane and vinyl silane oxygen radicals silane and two allylic silane oxygen radicals silane in unsaturated polyester/glass fiber in the system. Results show that contains unsaturated base of silane strength of higher than saturated, almost twice the significantly improved the resin/glass fiber 2 and caking. The theory of many use coupling agent or use the coupling agent but theory cannot form chemical compound system, it is powerless.
3 the diffusion theory
Barodkuu polymers proposed the poly-poly bonding diffusion theory, the main point is that the bonding between polymer with the same molecules (diffusion), and polymer molecular chain link segments and the diffusion of molecules (different), which proces strong adhesive relay. Based on the theory of the starting point is the most basic characteristics: polymer molecular structure and meek.
Two phase polymers interdiffusions of actual is dissolved, the size of the solubility of solubility parameter, the decision to close the solubility parameter, more easily mutually dissolved. The use of coupling agent that this theory in the field of fiber composites is widely used.

热心网友 时间：2023-10-14 03:09

In two phases consisting of composite materials, always have a photograph to melt flow state liquid or solid phase contact with another, then curing reaction to combine together, both in this process, the function and mechanism of the two alternate with is always people concern, but it is not entirely clear. The research results from existing for several theories, including chemical adsorption theory, the theory of infiltration, and the diffusion theory, electronic electrostatic theory, weak boundary theory and mechanical coupling theory, the deformation theory and the theory of absorption layer priority. A theory has its own existence, but also according to oneself cannot explain the fact. Sometimes, the two theories on the same problem is opposite, sometimes need several theory combined application to summarize all the experimental facts. 1 infiltrating adsorption theory The theory is that the bonding, polymer can be divided into two phases. First stage: polymer molecules using macro Brownian motion from the solution of melting, or move to sticking surface, Through the micro Brownian motion, chain molecules are graally to stick surface polargroup near. No solvents, chain molecules only local close to the surface, and under pressure or heating that can be reced, viscosity and surface by very near. The second stage: adsorption effect. When he was stuck and adhesive molecular spacing < 5A, van der Waals force begin to occur, thus forming the dipole-dipole keys, dipole inction - dipole, the hydrogen bonding, etc. The theory is that stick relay decided to combine, The Times are: (1) the same kind of adhesive bonding various materials can be, (2) general adhesive and inert, gluing body chemistry between them. Bancroft pointed out: the strong adsorption of adhesive bonding strength, high. Invasive belief: to make matrix can be spread in the fiber, the surface tension of substrate material must be less than or by coupling agent of critical surface tension. The data that bisphenol A surface tension of epoxy resin for 4.25 (10-5N/m, polyester resin for 10-35 5N/m, so the requirement of glass fiber surface tension of critical of epoxy resin is at least 10-4.25 5N/m above, polyester in 35 x 10-5N/m above, otherwise would cause in the interface void. This theory in practice, but not so prove in basic adhesive requirements, and further improve the performance, after improvement should be in the matrix of filler invasive, adsorption theory is a limitation, polymer film experiments showed that needed energy of 108erg/cm2, 104 - more than that between molecules needed to force the energy, which indicates that the interface between the molecules of not only; B experiments show adhesive power depends on the speed of adhesive layer stripping, but between the molecules of weak should not depend on two separate speed on the surface of the adhesive bonding, so not only decided by molecular force, C this theory is adhesive bonding and the polar groups based on the interaction of, so it cannot explain why the polarity between polymer will stick relay. 2 bonds theory In 1949 Lyaeger and put forward Bjorksten chemical theory

热心网友 时间：2023-10-14 03:10

chemical adsorption theory, the theory of infiltration, and the diffusion theory, electronic electrostatic theory, weak boundary theory and mechanical coupling theory, the deformation theory and the theory of absorption layer priority. A theory has its own existence, but also according to oneself cannot explain the fact. Sometimes, the two theories on the same problem is opposite, sometimes need several theory combined application to summarize all the experimental facts.
1 infiltrating adsorption theory
The theory is that the bonding, polymer can be divided into two phases. First stage: polymer molecules using macro Brownian motion from the solution of melting, or move to sticking surface, Through the micro Brownian motion, chain molecules are graally to stick surface polargroup near. No solvents, chain molecules only local close to the surface, and under pressure or heating that can be reced, viscosity and surface by very near. The second stage: adsorption effect. When he was stuck and adhesive molecular spacing < 5A, van der Waals force begin to occur, thus forming the dipole-dipole keys, dipole inction - dipole, the hydrogen bonding, etc. The theory is that stick relay decided to combine, The Times are: (1) the same kind of adhesive bonding various materials can be, (2) general adhesive and inert, gluing body chemistry between them.
Bancroft pointed out: the strong adsorption of adhesive bonding strength, high. Invasive belief: to make matrix can be spread in the fiber, the surface tension of substrate material must be less than or by coupling agent of critical surface tension. The data that bisphenol A surface tension of epoxy resin for 4.25 (10-5N/m, polyester resin for 10-35 5N/m, so the requirement of glass fiber surface tension of critical of epoxy resin is at least 10-4.25 5N/m above, polyester in 35 x 10-5N/m above, otherwise would cause in the interface void. This theory in practice, but not so prove in basic adhesive requirements, and further improve the performance, after improvement should be in the matrix of filler invasive, adsorption theory is a limitation, polymer film experiments showed that needed energy of 108erg/cm2, 104 - more than that between molecules needed to force the energy, which indicates that the interface between the molecules of not only; B experiments show adhesive power depends on the speed of adhesive layer stripping, but between the molecules of weak should not depend on two separate speed on the surface of the adhesive bonding, so not only decided by molecular force, C this theory is adhesive bonding and the polar groups based on the interaction of, so it cannot explain why the polarity between polymer will stick relay.
2 bonds theory
In 1949 Lyaeger and put forward Bjorksten chemical theory. The theory of the main ideas, coupling agent should contain at least two groups, the first kind of functional material and in theory can react in theory, the second groups can be in the curing reaction, and resin bond formation with chain resin, coupling agent, and molecular like "bridge", will be enhanced by a single firm base material and the connected together. For example, using