V-POSS/UPR非等温固化动力学与物理性能

Non-isothermal cure kinetics of V-POSS/UPR and physical properties

为了提高不饱和聚酯树脂（UPR）的性能,本文中以乙烯基笼型倍半硅氧烷（V-POSS）改性不饱和聚酯树脂,用非等温DSC法研究了UPR和5%V-POSS/UPR体系的固化反应动力学以及表观反应活化能与转化率之间的关系,测定了玻璃钢层压板的力学性能和电性能。结果表明,加入V-POSS固化反应Ea随反应程度增加而降低,通过使用两参数esták-Berggren（S-B）模型描述固化反应过程,得到了反应动力学方程。当V-POSS质量分数为5%时玻璃钢层压板拉伸强度达到最大值,提高了17.6 MPa,冲击强度随V-POSS加入量增加而降低,但在10%时冲击强度有所上升。层压板电性能随V-POSS加入量增加而提高,其中体积电阻率和表面电阻率提高1~2个数量级。

In order to improve the performance of unsaturated polyester resin（UPR）, the polyhedral oligomeric silsesquioxane containing vinyl group （V-POSS） was used to modify the unsaturated polyester resins. The curing kinetics and the relationship of apparent activation energy （Ea） with conversion a were studied by non-isothermal DSC. The properties of mechanics and electricity for the fiberglass-reinforced laminate were determined. The results show that the Ea decreases with increase of conversion a. The curing reaction could be described by autocatalytic Sestdk- Berggren （S- B） model and kinetic equations of curing reaction were obtained. The tensile strength of the fiberglass-reinforced laminate increases 17.6 MPa when the mass fraction of V-POSS is up to 5%. The impact strength is lower with V-POSS increase. The electric properties increase with increasing the content of V-POSS, while volume resistivity and surface resistivity rise by 1-2 orders of magnitude.