ICCAS OpenIR
Cross-Linked Polypropylene Prepared by PP Copolymers Containing Flexible Styrene Groups
Lin, Wentian1,2; Shao, Zhen1; Dong, Jin-yong1,2; Chung, T. C. Mike1
2009-06-09
Source PublicationMACROMOLECULES
ISSN0024-9297
Volume42Issue:11Pages:3750-3754
AbstractThis paper discusses an effective method to prepare cross-linked isotactic polypropylene (PP-X) with high purity (almost 100% gel content and no contamination) and high melting temperature and crystallinity. The reaction scheme involves a linear poly(propylene-co-p-(3-butenylstyrene)) copolymer (PP-BSt) containing few pendent styrene groups and the subsequent thermal treatment without any external reagent. The intermediate PP-BSt copolymers were prepared by a specific rac-CH(2)(3-tert-butyl-Ind)(2)ZrCl(2)/MAO catalyst that not only performs iso-specific propylene insertion but also incorporates BSt units with a preferred alpha-olefin insertion over styrene moiety. The combined features permit the preparation of linear PP-BSt copolymers with high molecular weight and high catalyst activity, without the presence of hydrogen. The resulting PP-BSt copolymers having some flexible pendent styrene moieties are completely soluble in xylene at elevated temperatures, and the solution case films show active cross-linking activity at temperatures > 160 degrees C by engaging in a Diels-Alder [2 + 4] interchain cycloaddition reaction between the pendent styrene units. Evidently, the flexibility of styrene units is important, which enhances the interchain cyclization to form a complete 3-D network, even with a very small amount of BSt units. In contrast, the corresponding poly(propylene-co-p-divinylbenzene) (PP-DVB) prepared by the same metallocene catalyst only shows moderate cross-linking efficiency under similar conditions.
DOI10.1021/ma9002775
Indexed BySCI
Language英语
WOS IDWOS:000266651500012
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:28[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/68216
Collection中国科学院化学研究所
Corresponding AuthorChung, T. C. Mike
Affiliation1.Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA
2.Chinese Acad Sci, CAS Key Lab Engn Plast, Inst Chem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Lin, Wentian,Shao, Zhen,Dong, Jin-yong,et al. Cross-Linked Polypropylene Prepared by PP Copolymers Containing Flexible Styrene Groups[J]. MACROMOLECULES,2009,42(11):3750-3754.
APA Lin, Wentian,Shao, Zhen,Dong, Jin-yong,&Chung, T. C. Mike.(2009).Cross-Linked Polypropylene Prepared by PP Copolymers Containing Flexible Styrene Groups.MACROMOLECULES,42(11),3750-3754.
MLA Lin, Wentian,et al."Cross-Linked Polypropylene Prepared by PP Copolymers Containing Flexible Styrene Groups".MACROMOLECULES 42.11(2009):3750-3754.
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