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SYNTHESIS AND CHARACTERIZATION OF WELL-DEFINED ALTERNATING ETHYLENE-PROPYLENE COPOLYMER
Li Wei1; Li Yang1; Hu Yanming1; Wang Lingfang2; Cui Dongmei2; Wang Yurong1
2010-08-20
Source PublicationACTA POLYMERICA SINICA
ISSN1000-3304
Issue8Pages:961-965
AbstractAlternating ethylene-propylene copolymer (alt-EP) was synthesized by hydrogenation of polyisoprene (HCPI) having high cis-1,4 content (ca. 100%), suitable molecular weight (M(n) = 41 x 10(4)), and relatively narrow molecular weight distribution (M(w)/M(n) = 1.02). The hydrogenation of HCPI was carried out with Ni(naph)(2)/Al(i-Bu)(3) catalyst at 60 degrees C and hydrogen pressure of 4.0 MPa in cyclohexane for 3 h. NMR and FTIR spectra showed that the characteristic peaks of carbon-carbon double bond disappeared in hydrogenated HCPI, indicating that the hydrogenation degree of the resulting polymer was up to 100%. GPC analysis indicated that the alt-EP maintained relatively narrow molecular weight distribution (M(w)/M(n) = 1. 12), and degradation or crosslinking reaction did not occur during hydrogenation reaction of HCPI. NMR and FTIR spectra as well as WAXD analysis showed that the alt-EP was well-defined ethylene-propylene copolymer having high alternation, and the present completely alternating ethylene and propylene copolymer was synthesized for the first time. Further, the thermal properties of HCPI and alt-EP were examined by TGA and DSC. The glass transition temperature of alt-EP was -63.3 degrees C, whose value is larger than that of HCPI (-66.7 degrees C). The onset temperature of weight loss of alt-EP was 355 degrees C and much higher than that of HCPI (266 degrees C), which suggesting that the thermal stability is enhanced upon hydrogenation.
KeywordAlternating Ethylene-propylene Copolymer Hydrogenation Polyisoprene
DOI10.3724/SP.J.1105.2010.10105
Indexed BySCI
Language英语
WOS IDWOS:000280971700001
PublisherSCIENCE CHINA PRESS
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/70362
Collection中国科学院化学研究所
Corresponding AuthorLi Wei
Affiliation1.Dalian Univ Technol, Sch Chem Engn, Dept Polymer Sci & Engn, State Key Lab Fine Chem, Dalian 116012, Peoples R China
2.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Li Wei,Li Yang,Hu Yanming,et al. SYNTHESIS AND CHARACTERIZATION OF WELL-DEFINED ALTERNATING ETHYLENE-PROPYLENE COPOLYMER[J]. ACTA POLYMERICA SINICA,2010(8):961-965.
APA Li Wei,Li Yang,Hu Yanming,Wang Lingfang,Cui Dongmei,&Wang Yurong.(2010).SYNTHESIS AND CHARACTERIZATION OF WELL-DEFINED ALTERNATING ETHYLENE-PROPYLENE COPOLYMER.ACTA POLYMERICA SINICA(8),961-965.
MLA Li Wei,et al."SYNTHESIS AND CHARACTERIZATION OF WELL-DEFINED ALTERNATING ETHYLENE-PROPYLENE COPOLYMER".ACTA POLYMERICA SINICA .8(2010):961-965.
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