tailieunhanh - Organic photo catalyst for controlled synthesis of poly(methyl methacrylate) using spirooxazine initiator

The obtained polymer also exhibited photochromic properties under UV irradiation both in solution and in solid state film. We are reliable believe that organicbased photoredox catalysts will enable new applications for controlled radical polymerizations in both small molecules and polymer chemistry. | TRƯỜNG ĐẠI HỌC SƯ PHẠM TP HỒ CHÍ MINH HO CHI MINH CITY UNIVERSITY OF EDUCATION TẠP CHÍ KHOA HỌC JOURNAL OF SCIENCE KHOA HỌC TỰ NHIÊN VÀ CÔNG NGHỆ NATURAL SCIENCES AND TECHNOLOGY ISSN: 1859-3100 Tập 14, Số 9 (2017): 94-104 Vol. 14, No. 9 (2017): 94-104 Email: tapchikhoahoc@; Website: ORGANIC PHOTO-CATALYST FOR CONTROLLED SYNTHESIS OF POLY(METHYL METHACRYLATE) USING SPIROOXAZINE INITIATOR Nguyen Tran Ha1*Duong Ba Vu2 1 Faculty of Materials Technology - Ho Chi Minh City University of Technology 2 Ho Chi Minh City University of Education Received: 06/8/2017; Revised: 19/9/2017; Accepted: 23/9/2017 ABSTRACT Photoinitiated metal-free controlled living radical polymerization of methyl methacrylates was investigated using the nuclear aromatic compound of pyrene. In the presence of photoredox catalysts and UV irradiation, spirooxazine initiator was used as initiator for polymerization of methyl methacrylate with good control over molecular weight in range of 10000 – 14000 g/mol and polydispersity below . Moreover, the obtained polymer also exhibited photochromic properties under UV irradiation both in solution and in solid state film. We are reliable believe that organicbased photoredox catalysts will enable new applications for controlled radical polymerizations in both small molecules and polymer chemistry. Keywords: ATRP, methyl methacrylate, metal-free ATRP, polymerization, spirooxazine. TÓM TẮT Xúc tác hữu cơ cho quá trình polymer hóa poly(methyl methacrylate) sử dụng chất khơi mào spirooxazine Quá trình polymer hóa methyl methacrylate được khảo sát sử dụng hợp chất vòng pyrene. Dưới quá trình chiếu sáng của tia UV và sự có mặt của hợp chất xúc tác quang và hợp chất khơi màu phản ứng polymer hóa spirooxazine, quá trình polymer hóa methyl methacrylate được thực hiện. poly(methyl methacrylate) được tổng hợp đạt trọng lượng phân tử trung bình khối trong khoảng – g/mol với độ đa phân tán của polymer thấp hơn .