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Synthesis of Chain End Functional Isotactic Polypropylene by the Combination of Metallocene/MAO Catalyst and Organoborane Chain Transfer Agent
Lin, Wentian1,2; Dong, Jinyong1,2; Chung, T. C. Mike1
2008-11-25
Source PublicationMACROMOLECULES
ISSN0024-9297
Volume41Issue:22Pages:8452-8457
AbstractThis paper discusses a simple and effective route to prepare chain end functionalized PP and PP diblock copolymers, with high molecular weight and high purity. The reaction scheme involves a versatile "intermediate" of borane-terminated isotactic polypropylene (PP-t-B), which was prepared under a specific reaction condition, involving an iso-specific metallocene catalyst, purified MAO activator (without TMA), 9-borabicyclononane (9-BBN) dimmer chain transfer agent, and ambient reaction temperature. During the propylene polymerization mediated by the rac-Me2Si[2-Me-4-Ph(Ind)](2)ZrCl2/MAO catalyst system, the PP propagating chain end (C-Zr active site) engages in a selective ligand exchange reaction with a B-H group in the 9-BBN dimmer. Evidently, the side reaction between the 9-BBN dimmer and the purified MAO is very slow at <35 degrees C, so that the normal polymerization-chain transfer reaction mechanism can effectively take place to form the PP-t-B polymer. The polymer molecular weight is inversely proportional to the molar ratio of [9-BBN]/[propylene] with a chain transfer constant (k(tr)/k(p)) of 1/65. Despite the high molecular weight and heterogeneous reaction conditions, the terminal borane group in PP-t-B is quantitatively interconverted to the OH group under a mild ionic oxidation reaction condition. It is also selectively auto-oxidized by oxygen to form a control radical macroinitiator that affords the chain extension with methymethacrylate monomers to form PP-b-PMMA diblock copolymers.
DOI10.1021/ma801469s
Indexed BySCI
Language英语
WOS IDWOS:000261003700028
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/121111/64184
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, Inst Chem, CAS Key Lab Engn Plast, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Lin, Wentian,Dong, Jinyong,Chung, T. C. Mike. Synthesis of Chain End Functional Isotactic Polypropylene by the Combination of Metallocene/MAO Catalyst and Organoborane Chain Transfer Agent[J]. MACROMOLECULES,2008,41(22):8452-8457.
APA Lin, Wentian,Dong, Jinyong,&Chung, T. C. Mike.(2008).Synthesis of Chain End Functional Isotactic Polypropylene by the Combination of Metallocene/MAO Catalyst and Organoborane Chain Transfer Agent.MACROMOLECULES,41(22),8452-8457.
MLA Lin, Wentian,et al."Synthesis of Chain End Functional Isotactic Polypropylene by the Combination of Metallocene/MAO Catalyst and Organoborane Chain Transfer Agent".MACROMOLECULES 41.22(2008):8452-8457.
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