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在无乳化剂的条件下,采用连续种子乳液聚合的方法制得了丙烯酸丁酯(BA)与苯乙烯(St)为壳,VAE乳液为核的核壳乳液。考察了反应温度、引发剂用量和壳层单体滴加速率对核壳乳液的稳定性、转化率以及乳胶粒粒径的影响,从而确定了最佳的聚合工艺。红外光谱(FT-IR)、差示量热扫描分析(DSC)验证了合成的乳液具有明显的核壳结构。热重分析(TG)和剥离力度的测试表明,通过种子乳液聚合改性后的VAE乳液,在耐热性和粘接性能等方面都有了显著的改善。
In the absence of emulsifier, continuous emulsion polymerization was used to prepare a core-shell emulsion with butyl acrylate (BA) and styrene (St) as the shell and VAE emulsion as the core. The effects of reaction temperature, the amount of initiator and the dropping rate of shell monomer on the stability, conversion and particle size of the latex were investigated. The optimal polymerization process was determined. FT-IR and DSC show that the synthesized latex has obvious core-shell structure. Thermogravimetric analysis (TG) and peel strength measurements show that VAE emulsions modified by seed emulsion polymerization have shown significant improvements in heat resistance and adhesion properties.