Preparation of telechelic oligomers by controlled thermal degradation of isotactic poly(1-butene) and poly(propylene-ran-1-butene)

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• 作者：Daisuke Sasaki ; Yasushi Okada ; Yoshihiro Suzuki ; Toshiki Hagiwara ; Shoichiro Yano ; Takashi Sawaguchi
• 关键词：Controlled thermal degradation ; Poly(1-butene) ; Poly(propylene-ran-1-butene) ; Telechelic oligomer
• 刊名：Polymer Degradation and Stability
• 出版年：2007
• 期刊代码：85_01413910
• 类别：ms
• 出版时间：February 2007
• 卷：92
• 期：2
• 页码：271-279
• 文件大小：412 K

摘要

It was found that telechelic isotactic oligo(1-butene) and telechelic oligo(propylene-ran-1-butene) could be isolated as nonvolatile oligomers from polymer residues resulting from the thermal degradation of isotactic poly(1-butene) and poly(propylene-ran-1-butene), respectively. Their structures were determined by ¹H and ¹³C NMR with attention being paid to their reactive end groups. The maximum average number of terminal vinylidene groups per molecule (f_TVD) was 1.8, indicating that about 80 mol%were α,ω-diene oligomers having two terminal vinylidene groups. This useful new telechelic oligomer had a lower polydispersity than the original polymer, in spite of its lower molecular weight and T_m. The composition of end groups of nonvolatile oligomers obtained by thermal degradation of poly(propylene-ran-1-butene) could be explained by the differences in bond dissociation energy and activation energy of elementary reactions during thermal degradation, based on the monomer composition of the original polymer.