Synthesis and Ring-Opening Metathesis Polymerization of Norbornene-Terminated Syndiotactic Polypropylene

详细信息    查看全文

• 作者：Amelia M. Anderson-Wile ; Geoffrey W. Coates ; Finizia Auriemma ; Claudio De Rosa ; Amelia Silvestre
• 刊名：Macromolecules
• 出版年：2012
• 出版时间：October 9, 2012
• 年：2012
• 卷：45
• 期：19
• 页码：7863-7877
• 全文大小：579K
• 年卷期：v.45,no.19(October 9, 2012)
• ISSN：1520-5835

文摘

Using nonliving bis(phenoxyimine)titanium catalysts activated by methylaluminoxane (MAO) in the presence of propylene, allyl-terminated syndiotactic polypropylene macromonomers with varying tacticity ([rrrr] = 0.80 and 0.94) and molecular weight (M_n = 3600 and 5600 g/mol) were produced. The end-functionalized polymers were converted to hydroxyl- and subsequently norbornene-terminated macromonomers. Two series of syndiotactic polypropylene comb-polymers were synthesized through metathesis polymerization of the norbornene-functionalized polypropylene. The molecular weight (M_n = 46鈥?00鈥?72鈥?00 g/mol) and polydispersity (M_w/M_n = 1.21鈥?.89) of the comb polymers was determined by gel permeation chromatography (GPC). Using differential scanning calorimetry (DSC), melting temperature (T_m) and crystallization temperature (T_c) were determined and both were observed to decrease with increasing conversion to poly(macromonomer). To the best of our knowledge, this is the first synthesis of comb-polymers from end-functionalized syndiotactic polypropylene.