Author/Authors :
Wan, Li-Ying Nanchang Hangkong University - School of Material Science and Engineering, China , Wan, Li-Ying Donghua University - State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, China , Chen, Le-Ping Nanchang Hangkong University - School of Material Science and Engineering, China , Xie, Xiao-Lin Nanchang Hangkong University - School of Material Science and Engineering, China , Li, Zhi-Peng Nanchang Hangkong University - School of Material Science and Engineering, China , Fan, Hong-Qin Nanchang Hangkong University - School of Material Science and Engineering, China
Abstract :
The novel core - shell polyacrylate composite hydrosols based on interpenetrating polymer networks (IPN) were synthesized through a new two-step and soap-free emulsion polymerization with seed hydrosol particles with no additional emulsifier. The diameter of the hydrosol particles is much smaller than that of the conventional emulsion, so it makes hydrosol particles show much better stability and coating film properties. The obtained core-shell composite hydrosol particles formed by the soft core of BA copolymer and the hard shell of MMA copolymer were characterized by infrared analysis and transmission electron microscope (TEM). The damping properties of polyacrylate IPN, linear IPN, copolymer and blend composed of the same recipe were investigated by dynamic mechanical analysis (DMA) and scanning calorimetry (DSC). The results indicated that the polyacrylate IPN hydrosol exhibited the best damping properties because of its microheterogeneous structure and the synergy effect between both BA and MMA components. While, the polyacrylate copolymer demonstrates only a narrow glass transition range and the polyacrylate blend demonstrates only two independent narrow glass transition ranges. The damping properties of the PBA/PMMA IPN hydrosol were investigated in details through different series of experiments. The results demonstrated that the IPN achieved better damping properties and processing performance under the conditions of 100% neutralization of AA with DEAE, DVB cross-linking agent content of 0.1% and MMA/BA as main monomers with a ratio of 6/4. As far as the novel soft core and hard shell P(BA-co-HEMA)/P(MMA-co-AA-co-HEMA) composite hydrosol is concerned, its damping properties are mainly due to the ratio of main monomers MMA/BA presented in this work
