将分散剂、纳米碳酸钙和聚丙烯(PP)切片按一定比例混合纺丝制得改性PP纤维。并研究了改性PP纤维的结构与性能。结果表明:当分散剂与纳米碳酸钙的质量比为1∶3,纳米碳酸钙质量分数为0.3%时,改性PP纤维的断裂强度和初始模量最大,分别为7.97,90.36 cN/dtex.纳米碳酸钙在改性PP纤维中分散均匀,且粒径为40~80 nm。与PP纤维相比,改性PP纤维的取向度变化不大,结晶度有所提高,但当纳米碳酸钙质量分数大于等于2%时,其结晶度下降明显。
The modified PP fiber was prepared by blending a dispersant,nano-calcium carbonate and polypropylene(PP) chips at a specific ratio.The structure and properties of modified PP fiber were studied.The results showed that the breaking strength and initial modulus were maximized as 7.79 and 90.36 cN/dtex respectively when the mass ratio of the dispersant to nano-calcium carbonate was 1∶3 and the content of nano-calcium carbonate was 0.3% by mass fraction.The nano-calcium car- bonate with particle size of 40-80μm......
对硫酸钡粉体应用于PVC-U复合材料进行了初步研究,着重论述了各组分对复合材料的力学性能和相对密度的影响,利用激光粒度测试仪对硫酸钡粉体进行了测试,得到了粒径分布曲线和累计曲线。结果表明,PVC树脂质量对复合材料的力学性能影响很大,对相对密度影响不大:当硫酸钡用量相同时,硫酸钡的活化与否与粒径大小对复合材料的相对密度影响不大;当硫酸钡用量增加时,复合材料拉伸强度降低,相对密度增加;随着DOP用量的增加,复合材料的拉伸强度降低,断裂伸长率显著增大,相对密度下降。...
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