ICCAS OpenIR
Investigations of the practical routes, structure, and properties for poly(aryl ether ketone ketone) polymers
Ke, YC; Wu, ZW
1998-01-24
Source PublicationJOURNAL OF APPLIED POLYMER SCIENCE
ISSN0021-8995
Volume67Issue:4Pages:659-677
AbstractDifferent 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.
KeywordPoly(Ary Ether Ketone Ketone)s(Pekks) Electrophilic Substitution Reaction Nucleophilic Substitution Reaction Thermal Properties Polymorphism Molecular Structure
Indexed BySCI
Language英语
WOS IDWOS:000071107000009
PublisherJOHN WILEY & SONS INC
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/74356
Collection中国科学院化学研究所
Corresponding AuthorKe, YC
Affiliation1.Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
2.Jilin Univ, Dept Chem, Changchun 130023, Peoples R China
Recommended Citation
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.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Ke, YC]'s Articles
[Wu, ZW]'s Articles
Baidu academic
Similar articles in Baidu academic
[Ke, YC]'s Articles
[Wu, ZW]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Ke, YC]'s Articles
[Wu, ZW]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.