硫酸钙晶须的制备及其改性聚丙烯性能的研究

在不同反应条件下制备了不同长径比的硫酸钙晶须(CSW)，利用硅烷偶联剂KH550(相对于CSW质量的2%)在110 ℃下对CSW进行干法改性.以硫酸钙晶须作为增强改性剂制备了PP/CSW复合材料.力学性能与差示扫描量热分析(DSC)结果表明:不同长径比的CSW对PP的力学性能和结晶性能均有提高；采用平均长径比为29的CSW添加剂，当添加的质量分数为20%时，复合材料的拉伸强度、弯曲模量分别比纯PP的提高了11%、104%；结晶温度比纯PP的提高了12 ℃；几种CSW对复合材料的热稳定性和耐热性都有改善，且随着CSW质量分数的增加，材料的热稳定性和耐热性提高越显著.

Preparation of Calcium Sulfate Whisker and Properties of Polypropylene/Calcium Sulfate Whisker Composites

Calcium sulfate whisker (CSW) with different length-diameter ratios was prepared under different reaction conditions and then it was dry-modified with silane coupling agent KH550(2% of CSW quality) at 110 ℃ for 1 h. Then PP/CSW composites were prepared for testing. The mechanical properties and the differential scanning calorimetry(DSC) analysis results show that the CSW with different length-diameter ratios have improved mechanical and crystallization properties of PP; the tensile strength and the flexural modulus of the composite with 20%(mass fraction) modified CSW with the length-diameter ratios of 29 were 11% and 104% respectively; the crystallization temperature is 12 ℃ higher than that of pure PP; the several types of CSW have all improved thermal stability and heat resistance of the composite, and with the increase of content of the whisker, the thermal stability and heat resistance of the composites improved more significantly.