Fractionation and characterization for a propylene-ethylene random copolymer
Zhang, YD; Wu, CJ; Zhu, SN
Source PublicationPOLYMER JOURNAL
AbstractA random copolymer of propylene with 3.5 mol% ethylene comonomer is firstly fractionated by temperature rising elution fractionation (TREF). Techniques including C-13 nuclear magnetic resonance (NMR) spectroscopy, Fourier transform infrared spectroscopy (FTIR), gel-permeation chromatography (GPC), crystallization analysis fractionation (Crystaf) and differential scanning calorimetry (DSC) are used to characterize the obtained fraction polymers. The results show that each fraction polymer is composed mainly of isotactic propylene sequence plus a small amount of ethylene comonomer and has uniform molecular weight and ethylene content. The PPP, PPE, and PEP are main part of triad sequence unit. As the elution temperature increasing, ethylene content of the fraction polymers decreases, number average molecular weight increases, and meanwhile number average sequence length of propylene, (n) over bar (p), increases, while that of ethylene, (n) over bar (E), decreases, close to 1. The results show that ethylene content affects linearly the melting temperature (T-m) in a range of ethylene content being as low as less than 10.23 mol%; there is a linear relationship between the reciprocal melting temperature (1000/T-m, K-1) and reciprocal number average molecular weight (M-n(-1)) in a range of number average molecular weight as low as less than 1.7 x 1x0(5).
KeywordElution Temperature Ethylene Content 1/k Melting Temperature Number Average Molecular Weight Sequence Length Tacticity Temperature Rising Elution Fractionation (Tref)
Indexed BySCI
WOS IDWOS:000179765200008
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Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorZhang, YD
Affiliation1.Beijing Res Inst Chem Ind, Natl Engn Res Ctr Polyolefin, SINOPEC, Beijing 100013, Peoples R China
2.Chinese Acad Sci, Inst Chem, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Zhang, YD,Wu, CJ,Zhu, SN. Fractionation and characterization for a propylene-ethylene random copolymer[J]. POLYMER JOURNAL,2002,34(9):700-708.
APA Zhang, YD,Wu, CJ,&Zhu, SN.(2002).Fractionation and characterization for a propylene-ethylene random copolymer.POLYMER JOURNAL,34(9),700-708.
MLA Zhang, YD,et al."Fractionation and characterization for a propylene-ethylene random copolymer".POLYMER JOURNAL 34.9(2002):700-708.
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