交联密度对聚硅氧烷/聚丙烯酸酯同步互穿聚合物网络阻尼材料性能的影响

Effect of Crosslinking Density on Damping Behavior of PMPS/PEMA SIN

由同步互穿聚合物网络 (SIN )制备得到一系列聚硅氧烷 /聚丙烯酸酯 (PMPS/PEMA)阻尼材料 ,当SIN中m(PMPS)∶m(PEMA)固定为 5 0∶5 0时 ,整个SIN交联点间平均分子量将随PEMA中聚丙二醇二丙烯酸酯 (PPDA)含量的增加而减小。DMA、DSC与AFM的研究结果表明 ,SIN内耗峰的形状、大小以及tanδ≥ 0 3的温度区间均随着PEMA中交联剂含量不同而变化 ,同时线性损耗模量 (E″) 温度 (T)曲线的形状、曲线下的面积 (LA)和线性损耗因子 (tanδ) 温度 (T)曲线下的面积 (TA)也随着PEMA中交联剂含量变化而变化。在交联剂用量为 5 %时 ,所制得的同步互穿聚合物网络材料的TA和LA有最大值 ,转变峰形成一高阻尼平台区 ,tanδ≥ 0 3的温度区间可达 170℃。

A novel simultaneous interpenetrating polymer networks(SIN) damping material has been synthesized based on polyphenylsiloxane(PMPS) and poly(ethyl methacrylate)(PEMA). The average molecular weight between crosslinking point in SIN was found decreased with increase of the crosslinking agent polypropylene glycol diacrylate(PPDA), content in PEMA when ω (PMPS)∶ ω (PEMA) was 50∶50. According to the DMA, DSC and AFM results, the loss peak profits, heights and the temperature regions of tan δ ≥0 3 all depended on the crosslinking agent content in PEMA, and it was also true for both the area under the curves of linear loss modulus vs temperature(LA) and the area under the linear loss factor vs temperature(TA). With mass fraction of crosslinking agent being 5%, the maximum TA and LA values were obtained and a damping platform appeared and the temperture region for tan δ ≥0 3 could reach 170 ℃.