Synthesis of nano-scale and submicron-scale polymeric core-shell rubber and reactive microgel particle as low-profile additives and tougheners for unsaturated polyester and vinyl ester resins by conventional and RAFT living free radical emulsion polymerizations

• Main Authors: Kuan-Liang Yeh, 葉冠良
• Other Authors: Yan-Jyi Huang
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/61222478300393758470

碩士 === 國立臺灣科技大學 === 化學工程系 === 103 === Synthesis of nano-scale specific core-shell rubber (s-CSR) by RAFT soapless emulsion polymerization via spontaneous phase inversion process and nano-scale or submicron-scale general prepose core-shell rubber (gp-CSR) by conventional emulsion polymerization with or without surfactant as low-profile additives (LPA) and tougheners for unsaturated polyester resins (UP) and vinyl ester resin (VER) have been investigated. Two types of conventional UP with different chemical structures, namely, MA-PG and MA-PA-PG, EPR and VER with degree of polymerization (n) = 0.16, 2, and 5, have also been synthesized so that styrene (St) /VER /CSR ternary systems with different miscibility can be designed. In the synthesis of s-CSR, the core was made from poly(butyl acrylate) (PBA),whereas the shell was made from poly(sodium acrylate(SA)-co-ethyl acrylate (EA)). For nano-scale gp-CSR, the core was made from PBA, the shell was made from poly(methyl acrylate)(PMA). For submicro-scale gp-CSR, the core was made from PBA, the shell was made from poly(methyl methacrylate) (PMMA). Futhermore, the shell of the CSR was modified by 5~15 mole percent of glycidyl methacrylate (GMA) as a comonomer to increase the molecular polarity and provide the specific functionality, such as epoxy group, for the shell of the CSR. By conducting phase separation experiments and employing Debye’s equation, the dipole moments of UP, VER, EPR and the shell component of the CSR can be calculated, and the phase characteristics of the St/VER/CSR, ternary system have been elucidated. Finally, the volume shrinkage characteristics and mechanical properties of the St/VER (n=2)/CSR ternary system after cure have also been explored.