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Synthesis and characterization of star-branched polyamide 6 via anionic ring-opening polymerization with N,N',N''-trimesoyltricaprolactam as a multifunctional activator 被引量:6
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作者 Ning Zhu Hua Gong +7 位作者 Wei Han Wen-Bo Zeng hai-xin wang Zheng Fang Xin Li Kai Zhang Zhen-Jiang Li Kai Guo 《Chinese Chemical Letters》 SCIE CAS CSCD 2015年第11期1389-1392,共4页
Star-branched polyamide 6 was prepared via anionic ring-opening polymerization of ε-caprolactam in the presence of a simple benzene-centered trifunctional activator of N,N',N"-trimesoyltricaprolactam. A high polyme... Star-branched polyamide 6 was prepared via anionic ring-opening polymerization of ε-caprolactam in the presence of a simple benzene-centered trifunctional activator of N,N',N"-trimesoyltricaprolactam. A high polymer yields of above 95% were achieved at 160 ℃ for 15 min utilizing ε-caprolactam magnesium bromide as a catalyst. Compared with its linear counterpart, the resultant star-branched polyamide 6 showed smaller relative viscosity (1.51 ), decreased melting temperature (218 ℃) and lower crystallinity (24.2%). The specific properties demonstrated the existence of a star-branched structure and provided potential advantages in engineering applications. 展开更多
关键词 Star-branched polymerPolyamide 6Anionic ring-opening polymerizationN N' N"-Trimesoyltricaprolactam
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Stochastic individual predicate/transition nets
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作者 Yao YUE Chun-ming ZHANG +2 位作者 hai-xin wang Guo-qiang BAI Hong-yi CHEN 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2009年第2期165-171,共7页
We analyze the drawbacks of generally distributed time transition stochastic Petri nets(GDTT_SPN) in evaluating the performance of parallel systems,and propose a more general model,stochastic individual predicate/tran... We analyze the drawbacks of generally distributed time transition stochastic Petri nets(GDTT_SPN) in evaluating the performance of parallel systems,and propose a more general model,stochastic individual predicate/transition nets(SIPTN). SIPTN has higher modeling power and could provide more realistic models compared to GDTT_SPN,because in SIPTN the sojourn time distribution is determined not only by the transition,but also by the individuals. It is further proved that GDTT_SPN is a subset of SIPTN. As SIPTN introduces folding techniques from predicate/transition nets,SIPTN models have simpler and more intuitive graphic notations and accordingly higher usability,and thus are suitable for constructing simulation models for parallel systems. 展开更多
关键词 Formal model Parallel system Performance analysis Simulation Stochastic Petri nets
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