文献类型：期刊文献

英文题名：Study on MMA and BA Emulsion Copolymerization Using 2,4-Diphenyl-4-methyl-1-pentene as the Irreversible Addition-Fragmentation Chain Transfer Agent

作者：Zhang, Zuxin[] Zhang, Daihui[] Fu, Gaowei[] Wang, Chunpeng[] Chu, Fuxiang[] Chen, Riqing[1]

第一作者：Zhang, Zuxin

通信作者：Chen, RQ[1]

机构：[1]Chinese Acad Forestry, Inst Chem Ind Forest Prod, Nanjing 210042, Peoples R China; Natl Engn Lab Biomass Chem Utilizat, Nanjing 210042, Peoples R China; Natl Forestry & Grassland Adm, Key Lab Chem Engn Forest Prod, Nanjing 210042, Peoples R China; Key Lab Biomass Energy & Mat, Nanjing 210042, Peoples R China

年份：2020

卷号：12

期号：1

外文期刊名：POLYMERS

收录：;EI(收录号：20200508100036);Scopus(收录号：2-s2.0-85078423459);WOS:【SCI-EXPANDED(收录号:WOS:000519848300080)】；

基金：This research was funded by special funds for basic scientific research operating expenses of central public welfare research institutions of Chinese Academy of Forestry, grant number CAFYBB2018ZB008.

语种：英文

外文关键词：2,4-diphenyl-4-methyl-1-pentene; irreversible addition-fragmentation chain transfer; emulsion polymerization; MMA; BA

摘要：As a chain transfer agent, 2,4-diphenyl-4-methyl-1-pentene (alpha MSD) was first introduced in the emulsion binary copolymerization of methyl methacrylate (MMA) and butyl acrylate (BA) based on an irreversible addition-fragmentation chain transfer (AFCT) mechanism. The effects of alpha MSD on molecular weight and its distribution, the degree of polymerization, polymerization rate, monomer conversion, particle size, and tensile properties of the formed latexes were systematically investigated. Its potential chain transfer mechanism was also explored according to the H-1 NMR analysis. The results showed that the increase in the content of alpha MSD could lead to a decline in molecular weight, its distribution, and the degree of polymerization. The mass percentage of MMA in the synthesized polymers was also improved as the amounts of alpha MSD increased. The chain transfer coefficients of alpha MSD for MMA and BA were 0.62 and 0.47, respectively. The regulation mechanism of alpha MSD in the emulsion polymerization of acrylates was found to be consistent with Yasummasa's theory. Additionally, monomer conversion decreased greatly to 47.3% when the concentration of alpha MSD was higher than 1 wt% due to the extremely low polymerization rate. Moreover, the polymerization rate was also decreased probably due to the desorption and lower reactivity of the regenerative radicals from alpha MSD. Finally, the tensile properties of the resulting polyacrylate films were significantly affected due to the presence of alpha MSD.