Structure-property relationships of in-situ PMMA modified nano-sized antimony trioxide filled poly(vinyl chloride) nanocomposites-猫眼课题宝

DOI：

10.1016/j.polymer.2004.02.028

发表时间：

2004-04

期刊：

Polymer

影响因子：

4.6

通讯作者：

中科院分区：

化学2区

文献类型：

--

作者：

Xiaolin Xie;Xiaolin Xie;R. Li;Qing-Xi Liu;Qing-Xi Liu;Y. Mai

采用原位甲基丙烯酸甲酯(MMA)/Sb2O3聚合法制备了纳米三氧化二锑（Sb2O3）颗粒。随后，将这些改性纳米粒子与聚氯乙烯（PVC）复合，制备PVC/ sb2o3纳米复合材料。原位MMA/ sb2o3聚合动力学表明纳米sb2o3颗粒对MMA聚合没有抑制作用。纳米sb2o3颗粒表面覆盖PMMA壳层，增强了与PVC基体的相互作用，使纳米sb2o3颗粒团块分解，提高了颗粒在基体中的分散性（平均粒径为60 ~ 80 nm），增强了颗粒与基体的界面附着力。因此，纳米sb2o3颗粒增强和增韧PVC。结果表明，在2.5wt%的原位PMMA改性纳米sb2o3颗粒中，杨氏模量、抗拉屈服强度、断裂伸长率和夏比缺口冲击强度均达到最佳。对拉伸试样微观破坏机制的详细研究表明，纳米sb2o3颗粒作为应力集中剂，导致纳米颗粒周围基体材料的脱粘/空化和变形。在冲击断裂作用下，纳米sb2o3颗粒延长了裂纹起裂时间，增加了纳米sb2o3颗粒与PVC基体强界面相互作用引起的裂纹起裂和断裂扩展的能量吸收。这些机制导致了纳米复合材料的冲击增韧。

Nano-sized antimony trioxide (Sb2O3) particles were modified by in-situ methyl methacrylate (MMA)/Sb2O3polymerization. Subsequently, these modified nanoparticles were compounded with poly(vinyl chloride) (PVC) to prepare PVC/Sb2O3nanocomposites. In-situ MMA/Sb2O3polymerization kinetics shows that nano-Sb2O3particles do not inhibit polymerization of MMA. PMMA shell covered on the surface of nano-sized Sb2O3particles have enhanced interactions with PVC matrix, breaking down nano-Sb2O3particle agglomerates and improving their dispersion in the matrix (average particle size of 60–80 nm) and also increasing the particle-matrix interfacial adhesion. Thus, nano-Sb2O3particles reinforce and toughen PVC. It was observed that at 2.5wt% of nano-Sb2O3particles modified by in-situ PMMA optimal properties were achieved in Young's modulus, tensile yield strength, elongation at break and Charpy notched impact strength. Detailed examinations of micro-failure mechanisms of tensile specimens showed that nano-Sb2O3particles acted as stress concentrators leading to debonding/voiding and deformation of the matrix material around the nanoparticles. Under impact fracture, the nano-Sb2O3particles prolonged crack initiation time, and increased energy absorptions for crack initiation and fracture propagation caused by strong interfacial interaction between nanoparticles and PVC matrix. These mechanisms lead to impact toughening of the nanocomposites.