MgO／不饱和聚酯树脂复合材料的制备与性能

摘要

The terephthalic type unsaturated polyesters resin（UPR）, prepared with dimethyl terephthalate（DMT）, maleic anhydride（MA） and propylene glyeol（PG）, was reinforced with the surface-modified MgO powder to prepare MgO/UPR composite through mechanical blending. The dispersion of surface-modified MgO powder in the UPR matrix, the effect of the mass fraction of MgO on the dynamic thermal mechanical properties, heat resistance and hardness of MgO/UPR composites were investigated. XRD, FTIR and SEM results illustrate that the surface of MgO is coated with a layer of organic functional groups and disperses well in UPR after being modified by sodium stearate. The results of dynamic mechanical analysis （DMA） show when the mass fraction of MgO is 9%, the MgO/UPR composite has the best dynamic mechanical properties, heat resistance, and slow decrease of storage modulus with increasing temperature. The glass transition temperature（Tg） reaches 191 ℃ which is 66 ℃ higher than that of the pure UPR. The hardness analyses indicate MgO/UPR composite has the maximum barcol hardness HBa 44 when the mass fraction of MgO is 4%, which is 18.9% higher than that of pure UPR.%利用对苯二甲酸二甲酯（DMT）、顺丁烯二酸酐（MA）和1，2-丙二醇（PG）制备对苯型不饱和聚酯树脂（UPR），然后与表面改性后的MgO粉体机械共混制备了MgO／UPR复合材料，考察改性后MgO粉体在UPR基体中的分散情况及其对MgO／UPR复合材料动态热力学性能、耐热性及硬度的影响。XRD、FTIR和SEM测试结果表明，经硬脂酸钠表面修饰处理的MgO粉体表面包覆了一层有机高分子链，在UPR基体中分散均匀。通过动态热机械分析仪（DMA）的分析测试可知，当MgO质量分数为9％时，MgO／UPR复合材料具有最佳的综合力学性能及耐热性，储能模量随温度的升高下降趋势最为平缓，玻璃化转变温度（L）达到191℃，比纯UPR提高了66℃。硬度测试结果表明，当MgO质量分数为4％时，MgO／UPR复合材料的巴氏硬度达到最大值HBa44，比纯UPR提高了18．9％。