Effect of Disperse Relatively High Molecular Alloy on Toughening and Brittle-Rough Transition

Classification No. 8324 Article ID Number of the State Planning Commission Key Project Planning Committee 855060310.

The first draft was received on March 26, 1999; the revised draft was received on April 17, 2000.

The brittle-ductile transformation of polymer alloys is the theoretical basis for the design and preparation of tough polymer alloy material blending systems and the development of new approaches to toughening. It is also a hot topic and a frontier for current research. 17. et al. The critical grain spacing of particles is used as a criterion for the brittle-ductile transformation of polymer alloys, and the morphology of polymer alloys has been improved from qualitative phenomenological observations to semiquantitative numerical investigations. Then, from the viewpoint of percolation, he also considered that the yield and continuity of the matrix between dispersed phases is the root of the brittle-ductile transition. Therefore, a criterion network for the thickness of the critical stress volume sphere dispersion layer was proposed. In relation to the disperse phase material of the temperature matrix material and other factors, 9141.3 and 6 indicate that the damage zone of the mixed gold is composed of a silver line damage zone and a shear yield damage zone, when the shear yield zone is occupied in the entire damage zone. After the ratio reaches a fixed value, the briquettes and tough transitions occur in the mixed-mixture, so he mentions that the cited criteria for brittle- tenacity transformation of polymer alloys are not satisfied. Although these theories can all reflect the disperse phase The content and particle size of the alloy material brittle transition.

However, they are all related to the dispersed phase of the elastomer. There is no discussion about how the rigid dispersed phase affects the brittle-ductile transformation of the alloy. Ting Xian proposed that the concept of rigid matrix dispersed phase can toughen the polymer alloy is the Japanese scholars and others, and pointed out that the key to the toughness of the alloy material is the role of the hydrostatic stress formed by the rigid dispersed particles in the matrix. Whether the force can be cold plastic deformation along the tensile force. PCT is also under the university. Shen et al., referring to the theory of toughening of elastomers, proposed the idea of ​​a wide range of rigid body toughening and blending of gold, and used the method of dimensional finite element, 616 torn PCT to derive a wide range of shear behaviors for the alloy matrix, namely the rigid body disperse phase. The criteria for increasing the enthalpy 7. This article intends to reveal some internal relations between the rigid body dispersed phase and the elastomer dispersed phase toughening commingled gold mechanism.

1 experimental methods Experimental materials, 00 and 0 polypropylene. The various raw materials having a predetermined ratio are put into a high-speed stirrer and sufficiently kneaded, and then extruded and pelletized on a single-screw extruder to obtain a co-mixed gold material. A small amount of the mixed gold aggregates is added to the multi-functional small mixer, 1 in the mixing chamber, and the rotary mixing head is used to lift up and down the mixture at a specified temperature. After the pellets are melted and mixed uniformly, the materials are injected into the mold and cooled. After getting a sample strip.

Take about 10 samples of polymer alloy, starting from 30, and increase the temperature at 20°C. Use a positive thermal differential scanning calorimeter to test the thermal properties of the polymer alloy sample DSC. In the strength of GB104979 and GB104C79 The effect is not good. There is a phenomenon that the interface is debonded from the matrix. The full-brittleness of the bright alloy is broken. The composition of the sample in the dome is 0100, 200, 2, and 3, and there is a phenomenon of drawing at the fracture, indicating that the material is flawed. Sexual rupture. (6) A TEM photograph of a piece of a 6-stained piece was prepared by slicing the tensile sample in the direction of stretching at the rupture neck in accordance with the method of Graham et al. In the co-blended gold PVC100CPP5, no brittle-ductile transition occurred without the addition of CPE. The brittle test polymer alloy material sample mechanical properties. In the face of the fracture surface of the polymer alloy impact specimen, the shape of the fracture opening was observed along an INSTRUMENTS 250 MK3 scanning electron micrometer SEM under the condition of 1 and was observed. According to method 16 of Kum.hi et al., a tensile sample of a polymer alloy was sliced ​​along a tensile direction at a breaking defect portion, and was dyed and stained. The microscopic morphology of the polymer alloy tensile sample was observed with a TEM 8U0 type transmission electron microscope and photographed.

2 Results With the increase of the amount of ten phases, the impact strength of the co-mixed gold continued to increase, and the value of the co-mixed gold increased rapidly. In total, the alloy began to undergo brittle-ductile transformation. When adding a large rigid body to this blending system, the time is divided.

The impact strength and brittle-ductile transition of the blended alloys have changed. When the amount of yttrium used is less than 2 parts, the impact strength value of the blended gold is changed before and after the brittle-ductile transformation, the increase in the amount of the lamp is increased, and the brittle-ductile transition is advanced. Accompanying the increase in dosage, the impact of the blended gold was lower than that of the non-added blend, and the brittle transition lag 1. The amount of CPP was further increased by 8 parts, and no brittle twist change occurred. Rigid body dispersed phase, tensile yield stress on the blended material. The impact is not significant 5. Before and after adding 0 with the same proportion, the impact of tile alloy material; strength of the value of the difference, with the increase of matrix toughness, the increase in the toughness of the cerium containing cerium system Increase 4.

Tian 4 had a late arrival at a different 0. CPPHIIUt, 06, 嘹喙 旌 旌 鸪寤髑慷 鸪寤髑慷 , , , , , , , , , , , , , , , , , , , , , , , , ,. The particles of the dispersed phase did not deform. After adding 0, a brittle-ductile transition occurs. The disperse phase particles, whether it is a brand or a rigid body, are all deformed along the stretching direction during the fracture process of the co-mixed gold. Among them, the darker one is the rigid body disperse phase 0, and the shallower one is the elastomer disperse phase. 0 mouth 6.

According to the deformation mode of the absorption and dissipation of the alloy material during fracture, the brittle-ductile transformation is the transformation of the mass deformation mechanism from the generation of the silver streaks to the occurrence of the shear yield, and the addition of the dispersed phase of the elastomer contributes to this transformation and can increase. The drillability of the polymer alloy material until the occurrence of brittle-ductile transition 15 such as Tian. 2. For the rigid body dispersed phase, the dispersed phase added 0, the impact strength of the alloy material increases. This is the contribution of the rigid body disperse phase CPP4. The way in which the rigid body disperse phase CPP toughened 3VC is mixed with gold is that the rigid disperse phase particles undergo cold drawing due to the matrix-forming water-compressive stress. The deformation absorbs the expensive energy to increase the toughness of the alloy 6, but the deformation of the rigid-phase disperse phase in the cold-rolled shell is that the alloy material must have a certain toughness and deformation capability to form the hydrostatic compression stress. The results of this paper show that 63 and Yang 4, when the rigid body disperse phase 0 mouth does not occur in the tensile deformation of cold drawn parts deformation. The alloy's ductile impact strength has indeed increased, and the brittle-ductile transition has advanced. The apparent increase is not due to the absorption of the noble energy by the rigid disperse phase particles through the cold pull deformation. The reason is. The hard-shelled disperse mandarin oranges can be used as a stress concentrator like the disperse phase of the steroidal body, and the silver striations are generated by initiating the matrix. The toughness of the gold-removing material is increased by the flexural shearing, and the brittle-ductile transformation process is advanced. therefore. The effect of the quenching polymer alloy material on the impact strength of the matrix is ​​that the matrix can form the silver grain, and the yield shear band absorbs the bulk energy to enhance the toughness of the material; under the effect of the water compressive stress, the dispersed phase occurs. Absorption and dissipation of energy in cold deformation. Toughened co-blend to factory elastomers. The main role of the disperse phase is to induce tannins to form silver lines. The pre-yield cut band absorbs the dissipative energy to improve the toughness of the material, whereas the rigid body disperse phase toughens the alloy material. Due to the fact that the phase particles absorb the dissipated energy during this sudden deformation, the rigid disperse phase also ignores the effect of causing the matrix to form a silver-lined shear band to absorb the dissipative boat test to improve the toughness of the alloy material. This can be mountain. The total energy dissipated by the alloy material is the total energy absorbed by the energy-absorbing and disperse-phase particles formed by the matrix through the formation of silver-stretch yield milk cut bands and the cold dissipated plastics under the action of hydrostatic pressure stress. Together. With the increase of the disperse phase, the rigid body of the elastomer 4 is increased, and the cold-pulling plastic deformation of the dispersed phase particles rapidly becomes difficult.

The clamped hydrostatic stress also increases. In this way, the proportion of those who can absorb helium, which can reach the total energy felt that disperses throughout the alloy material, is also increasing.

For blending the system. When 0 is contained, less, and the mixed gold has not yet undergone brittle-ductile transformation. The material is still brittle, and when a rigid disperse phase is added thereto, it is difficult to deform due to the filler quality. EFA forms a hydrostatic compressive stress that causes tensile yield deformation of the as-mantled bifurcation phase. Therefore, the impact strength of the alloy material cannot be improved by cold-absorbing plastic deformation. Can only produce silver streaks to absorb dissipative impact energy to increase the impact strength of alloy materials. With the addition of a yield shear band to terminate the substrate, the silver streaks produced by the crucible are terminated. When the gate site is less, the material will not undergo brittle fracture, and the lamp will have a brittle and ductile transition. When there is an increase in the amount of precious metals, the rigid bodies are more dispersed than each other, and the hydrostatic stress field interacts with each other, resulting in a matrix compressive stress of 17 睁 due to the fact that the modulus is much higher than that of the elastomer. Elastomer 5 is a rigid body stress concentrating agent that is relatively difficult to deform, although it can cause the substrate to produce silver lines but does not easily form a yield shear band to effectively stop the growth of silver lines; the interfacial bonding strength between matrix and disperse phase is not strong. Due to the debonding of the interface during stress, the alloy material undergoes brittle fracture and the deformability is reduced. Therefore, the matrix deformability deteriorates when the lanthanum is contained for a long time, and the material's properties deteriorate, the brittle-ductile transition lags behind, or even does not occur at all. Brittle crucible transformation 2. Yes, the initiation and effective termination of the silver streaks is an important factor in determining whether the rigid body disperse phase can toughen the alloy material and promote its brittle-ductile transformation.

3 Conclusion Disperse phase in the formation of the hydrostatic pressure of the matrix for the deformation of the absorption of energy to make waste, so that the alloy material increase, when, as a stress concentration agent to initiate the substrate to produce silver grain and yield shear band, so that alloy material, Toughening, toughening, and transition, Yi, 2 Zhang, Yudong, Jin, Riguang, Chemical Progress, 4,49,19943, Zhang, Yudong, Jin, Riguang, Polymer Materials Science and Engineering, 136, 64,19974, Zhang Yudong, Jin Sun, Polymer Materials Science and Engineering, 145, 64i985, Zhang Yudong Jin Tianguang, Polymer Materials Science and Engineering, 14e, 92W98 Polymer, 35,315199414 Jiang Wei, Li Haidong, Liang Haojun, Jiang Bingzheng, Polymer Materials Science and Engineering, 146,102199818 Zhang Yudong, Chinese Patent 2