Toughened Engineering Plastic
The core-shell polymer particles are composite particles having a double layer or a multilayer structure composed of components having different chemical compositions or different aggregated forms. In 1957, Rohm & Haas of the United States first developed a core-shell polymer of the trade name K120. In the 1960s and 1970s, companies such as Japan and Germany also developed similar products. In the early 1980s, Japanese scholar Okubo proposed a new concept of “particle design.”
So far, the core-shell structure of polymers has been a hot topic of research, and has made great progress in its synthesis, structure, morphology, properties, applications and many other aspects.
The research team selected maleic anhydride grafted acrylonitrile-butadiene-styrene copolymer (ABS-g-MAH), maleic anhydride grafted ethylene-octene copolymer (POE-g-MAH) and maleic anhydride. Copolymer (SMA) three compatibilizers were studied for their effect on the compatibilization of PA6/ABS alloy and the amount of compatibilizer on the toughness of PA6/ABS alloy. Both of them can improve the interface energy of PA6 and ABS, and improve the toughness of PA6/ABS.
Among them, ABS-g-MAH has the best compatibilizing effect on PA6/ABS alloy. In addition, with the increase of the amount of ABS-g-MAH, the notched impact strength first increased and then decreased. When the mass fraction was 20%, the notched impact strength of PA6/ABS alloy increased the most, without adding ABS-g-MAH. 10 times that of PA6/ABS alloy.
The research group selected surface modified carbon nanofibers (CNF) and caprolactam to prepare PA6/CNF composites by in-situ anion ring-opening polymerization. Through experiments, the surface-modified CNF is uniformly dispersed. The addition of a small amount of CNF leads to the filler-matrix stress transfer induced by the interfacial covalent bond, which can significantly increase the tensile strength of PA6. At the same time, CNF plays a role in the matrix during crack propagation. The role of the bridge has also increased the notched impact strength of the PA6.
Tianjin University of Technology used bamboo fiber and PP fiber as raw materials to prepare mixed fiber preforms by non-woven engineering. The bamboo fiber reinforced PP thermoplastic composite was prepared by hot pressing process. The mass ratio of bamboo fibrils to PP fibers is 50/50. When the molding temperature, time and pressure are 190 °C, 30 min and 30 MPa, respectively, the obtained composites have the best mechanical properties, and their tensile strengths in the longitudinal and transverse directions are 96.6 respectively. MPa and 82.3 MPa; longitudinal and transverse bending strengths are 400.7 MPa and 367.3 MPa, respectively.
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