Synthesis of a novel one-handed helical poly(phenylacetylene) bearing poly(l-lactide) side chains |
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| Authors: | Chunhong Zhang Fangbin Liu Qianqian Geng Shuang Zhang Xiande Shen Ryohei Kakuchi Hideki Misaka Toyoji Kakuchi Toshifumi Satoh Ryosuke Sakai |
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| Institution: | aPolymer Materials Research Center, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin 150001, China;bKey Laboratory of Superlight Materials and Surface Technology, College of Materials Science and Chemical Engineering, Harbin Engineering University, Ministry of Education, Harbin 150001, China;cDivision of Biotechnology and Macromolecular Chemistry, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628, Japan;dDepartment of Materials Chemistry, Asahikawa National College of Technology, Asahikawa 071-8142, Japan |
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| Abstract: | The living ring-opening polymerization of l-lactide was carried out by using organocatalyst to synthesize the molecular weight controlled poly(l-lactide) with an phenylacetylenyl end group (HC C PLLA), then the homopolymerization of HCCPLLA was performed by using two different rhodium catalysts. Low molecular weight poly-PLLA6-1 (Mw,SEC-MALLS = 46,700) was synthesized by using Rh(nbd)BPh4 as the catalyst, and higher molecular weight poly-PLLA6-2 (Mw,SEC-MALLS = 471,000) was synthesized by using the Rh(nbd)Cl]2/Et3N catalyst system. Then high molecular weight poly-PLLA20, poly-PLLA29, and poly-PLLA68 were successfully synthesized by using the Rh(nbd)Cl]2/Et3N catalyst system. The α values of the poly-PLLAs using Rh(nbd)Cl]2/Et3N catalyst system were all in the range of 0.6–0.8, this means that these polymers possess linear flexible chain. It is concluded that Rh(nbd)Cl]2/Et3N was more suitable for the synthesis of the cylindrical polymer brush, poly-PLLA with high molecular weight. The analyses of the CD spectra indicated that poly-PLLA possesses a predominantly one-handed helical conformation, temperature and solvents had significant influences on the helical structure of poly-PLLA. |
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| Keywords: | Living ring-opening polymerization Organocatalyst l-lactide) macromonomer" target="_blank">Poly(l-lactide) macromonomer Rhodium catalyst Poly(phenylacetylene) Optical activity |
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