弱界面无机刚性粒子改性UPVC力学性能的研究

Mechanical Properties of Unplasticized PVC with Inorganic Particles in Weak Interface Adhension

考察了硬脂酸包覆沉淀CaCO3的粒径、用量及塑炼温度对UPVC力学性能的影响。研究结果表明:减少CaCO3用量或CaCO3的粒径均有利于获得较高的屈服强度;增加CaCO3的用量或减少所用CaCO3的粒径均有利于UPVC弹性模量提高;适当增加亚微米或纳米CaCO3的用量可提高PVC的缺口冲击强度,亚微米CaCO3的最佳用量为15份,纳米CaCO3的最佳用量为40份。为了获得力学性能优化的UPVC,填充亚微米CaCO3的UPVC宜于较高温度加工,填充纳米CaCO3的UPVC宜于较低温度加工。在纳米CaCO3填充的UPVC中,仅用少量CPE即可得到超韧的UPVC材料。

Effects, as content and size of rigid particles, on mechanical properties of UPVC filled with CaCO3 particles coated with sterate were studied. The elastic modulus would be increased with a higher content or a smaller diameter of rigid particles. And a higher yield strength would be maintained at a lower content or smaller particles of the filler. Rigid particles in submicrometer grade or nanometer grade could be used to toughen UPVC. The optimum content of the submicrometer CaCO3 is 15 phr under a higher processing temperature at which PVC primary particles been melted. For the nanoCaCO3,the optimum content is 40 phr but under a lower processing temperature to maintain PVC primary particles.