A new toughening method of cyclic polyester oligom

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A new toughening method of cyclic polyester oligomer

cyclic polyester oligomer (CBT) was industrialized by American cycles company in 2005. It is a matrix resin for composite materials with high flow, high infiltration ultrasonic utilization and high filling capacity. CBT has low melt viscosity. After adding catalyst, it can polymerize at a low temperature (such as 190 ° C) to produce thermoplastic engineering plastic pbt5.3. The compressive strength and flexural strength can be controlled within tens of seconds to tens of minutes. There is no reaction heat and VOC release. CBT can be processed by almost all the processing methods of thermoplastic and thermosetting resins, and has been successfully applied to automotive, wind energy, construction, sports equipment, navigation, aviation and other fields

cbt obtained after ring opening polymerization has the same structural unit and similar physical, chemical and mechanical properties as the conventional PBT obtained by polycondensation, but it has insufficient toughness. Its brittleness mechanism has been a problem that has plagued the academic community for many years. Brittleness has also become one of the key factors that hinder the large-scale application of CBT in the field of thermoplastic composites. Therefore, the toughening modification of PCBT and its composites has become the goal of many researchers. In situ copolymerization, nano particle toughening modification and other means have been tried, but these modifications must introduce new components, which will bring negative effects such as the increase of CBT viscosity or the decrease of strength and melting point

the research team of fiber material preparation technology of Ningbo Institute of materials, Chinese Academy of Sciences carried out systematic research work around the polymerization process and mechanism of CBT, and finally proposed a new toughening method, that is, without changing the reaction conditions and increasing the viscosity of the system, through the screening and purification of CBT components, directly regulate the polymerization process and crystallization behavior of the product, so as to achieve the purpose of toughening, The new initiation polymerization and embrittlement mechanism are clarified, which opens up a new way for the in-depth research and industrial application of CBT. The related work was published in polymer chemistry, a publication sponsored by the Royal Society of Chemistry (RSC)

the above work-related CBD (5) 00 electronic pendulum impact tester was used to test its room temperature impact performance, which was supported and supported by Zhejiang innovation team (2009r50013), Ningbo innovation team (2009b21008), Ningbo Key Laboratory of polymer materials (2010a22001) and National Key Laboratory of fiber material modification (Donghua University) (v201106)

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