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Chinese Academy of Sciences Institutional Repositories Grid
Investigations of the practical routes, structure, and properties for poly(aryl ether ketone ketone) polymers

文献类型:期刊论文

作者Ke, YC; Wu, ZW
刊名JOURNAL OF APPLIED POLYMER SCIENCE
出版日期1998-01-24
卷号67期号:4页码:659-677
关键词Poly(Ary Ether Ketone Ketone)s(Pekks) Electrophilic Substitution Reaction Nucleophilic Substitution Reaction Thermal Properties Polymorphism Molecular Structure
ISSN号0021-8995
英文摘要Different routes for preparing poly(aryl ether ketone)s (PEKKs) are presented and compared. The properties of PEKKs are related to the content of metaphenyl links in the molecular main chains, the molecular chain branching degree, the gelation content by molecular crosslinks, and, especially, the relative content of crystal form II to crystal form I of the PEKK polymorphism. When the molecular T/I ratio of 50/50 in the polymer chains is reached, the obtained PEKK has a lower melting point and gelation content (2% or so). The PEKKs prepared from the electronical substitution route (E route) often have a 0-30% content of crystal form II (relative to the mixed form I and form II), which is much more than that in PEKKs from the nucleophilic substitution route (N route, form II accounts for 0-20%). The relatively unstable crystal form II resulted in the unstable and difficultly predicted thermal properties of PEKKs. PEKKs from different routes provide samples with melting points from 360 to 397 degrees C (T-m) and glassy transition temperatures (T-g) from 167 to 176 degrees C and the equilibrium melting point of 411 degrees C for para-PEKK, while the tensile strength of the homopolymer PEKK and copolymers of PEEKK (poly(aryl ether ether ketone ketone)-PEKK can reach 100 MPa prepared by the N route. The high T-g makes PEKK polymers practically useful while too high T-m and a very small difference between T-m and T-d (degradation temperature) produce obstacles to its wide application. The reaction mechanisms of both electrophilic and nucleophilic routes are investigated and discussed in detail. Results show that the molecular chain branched by solvents and monomers with many activated points may be partly reduced to some extent by the oligomer and extruding route. (C) 1998 John Wiley & Sons, Inc.
语种英语
WOS记录号WOS:000071107000009
出版者JOHN WILEY & SONS INC
源URL[http://ir.iccas.ac.cn/handle/121111/74355]  
专题中国科学院化学研究所
通讯作者Ke, YC
作者单位1.Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
2.Jilin Univ, Dept Chem, Changchun 130023, Peoples R China
推荐引用方式
GB/T 7714
Ke, YC,Wu, ZW. Investigations of the practical routes, structure, and properties for poly(aryl ether ketone ketone) polymers[J]. JOURNAL OF APPLIED POLYMER SCIENCE,1998,67(4):659-677.
APA Ke, YC,&Wu, ZW.(1998).Investigations of the practical routes, structure, and properties for poly(aryl ether ketone ketone) polymers.JOURNAL OF APPLIED POLYMER SCIENCE,67(4),659-677.
MLA Ke, YC,et al."Investigations of the practical routes, structure, and properties for poly(aryl ether ketone ketone) polymers".JOURNAL OF APPLIED POLYMER SCIENCE 67.4(1998):659-677.

入库方式: OAI收割

来源:化学研究所

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