【摘要】 研究了组成为 1phr和 10 phr的超细碳酸钙 (Ca CO3 ,0 .1μm)经偶联剂处理前后 ,填充聚丙烯(PP)的拉伸性能和结晶行为。结果表明 :Ca CO3 的加入增加了 PP的杨氏模量 (E) ,降低了 PP的断裂伸长率 (εb) ,1Phr样品与未填充 PP的 εb 的比值为 0 .5 6 ,10 phr时则迅速降至 0 .0 4。这一变化趋势明显不同于普通 Ca CO3 填充 PP所表现出来的行为。表面处理样品的 E和 εb 均大于相应组成的未经表面处理的样品 ,SEM照片显示偶联剂的作用改善了 Ca CO3 / PP的界面粘接性能。WAXD分析表明 ,Ca CO3 的加入提高了 PP的结晶度 ,结晶形态以 α晶为主 ,晶胞参数和微晶尺寸均有一定程度的变化。DSC结果表明 ,除了 CTUCPP- 10样品的过冷度降低以外 ,其余样品的过冷度无明显改变更多还原

【Abstract】 The tensile and crystallization behaviors of polypropylene(PP) filled with treated or untreated ultrafine calcium carbonate (CaCO 3, 0.1 μm) have been studied at the compositions of 1 phr and 10 phr. The addition of CaCO 3 increases Young′s modulus ( E ) of PP and decreases elongation at break ( ε b) of PP. The ε b ratio of 1 phr sample to PP is 0.56 and rapdily reduces to 0.04 for 10 phr sample, which behaviors are differently from general CaCO 3/PP composites. Surface treatment of CaCO 3 with a silicon coupling agent KH550 enhances the adhesion of the filler and polymer, which further modifies the strength properties. WAXD results show that the addition of CaCO 3 increases the crystallinity of α PP in the composites. The sizes of crystallites and the unit cell parameters of α PP are varied by the addition of CaCO 3. DSC results show that the addition of CaCO 3 reduces the supercooling in CTUCPP 10 sample and no obviously variation for other samples.更多还原