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The microscopic structure of the core-shell particles on the fracture toughness of PA6

Author: SunLiLi
Tutor: ZhouChao
School: Changchun University of
Course: Polymer Chemistry and Physics
Keywords: PA6 Modifier of the core-shell structure Brittle-ductile transition Mechanical Properties Compatibility
CLC: TQ323.6
Type: Master's thesis
Year: 2010
Downloads: 32
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Abstract


The polymer material in the actual use of the process, not only has a high strength, but also should have a higher toughness, so the plastic toughening polymer materials science has been an important subject. Nylon 6 (PA6) as an important engineering thermoplastics, its the toughening of great significance and value. PA6 are notch sensitive material, it has a very high crack initiator and the lower crack propagation, and thus, the notched Izod impact strength, particularly low. The core-shell structure modifier as toughening agent for PA6 overcome its notch sensitivity, improve the notched impact strength. The core-shell structure modifiers with other types of impact modifiers main difference is that the size of the core-shell particles in the synthesis process is determined, and dispersed into the matrix resin unchanged. Linear polymer, or after the particle size of the main body rubber blends largely dependent on processing conditions. Controllable and modifier particle size of the core-shell structure, particle size distribution is narrow, and is conducive to the toughening of plastic. This thesis uses the core-shell structure of the modifier is a copolymer of acrylonitrile - butadiene - styrene (ABS), nuclear polybutadiene (PB) and the rubber phase, the shell is styrene - acrylonitrile (SAN) copolymer . The main content of this thesis is as follows: 1, synthesized by emulsion reactive core-shell particles ABS-g-MA with different core-shell ratio of core-shell structure modifiers toughened PA6. The results show that: the core-shell ratio of 70/30, notched impact strength of the blend has been markedly improved, super-tough PA6 alloy. 2, the obtained core-shell ratio of 50/50 core-shell particles with PA6 blends, by adding different compatibilizing agent to change the performance of the blends. The results show that: the blend material, compared to the other compatibilizer prepared The compatibilizer the SAM302 can make blends significantly improve. Brittle-ductile transition and fracture behavior of different PA6/ABS blends the core-shell structure toughener phase interface process with PA6 blends differences. By the results of experimental tests, the interface higher strength and better mechanical properties the PA6/ABS-g-MA relative PA6/ABS-g-AA. 4. The prepared emulsion polymerization technique different internal structure of the core-shell structure modifier ABS ternary blends prepared with the PA6 / Compatibilization agent SAM302. The mechanical properties of the test results show that the same proportion of thin spline relative to the mechanical properties of thick spline, can significantly thin spline notched impact strength. 5, the use of epoxy resin (Epoxy resin) Epoxy resin the Content on performance of toughened PA6/ABS-g-MA blend of compatibility between PA6. The results show that: Epoxy resin in the rubber content of the ABS-g-MA was 25%, the amount of the mechanical properties of the blend can be significantly improved.

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polycondensation resin and plastic > Polyamide resin and plastic
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