工艺因素对ZrO2( f ) / PMMA PMA复合材料抗折强度的影响

以聚甲基丙烯酸甲酯聚丙烯酸甲酯( PMMA-PMA) 为基体, 钇稳定氧化锆纤维为增强相, 采用悬浮聚合的方法, 制备了氧化锆短纤维增强PMMA-PMA 义齿基托复合材料。分别研究了单体配比、引发剂用量和氧化锆纤维质量分数对复合材料性能的影响。采用万能材料试验机、扫描电子显微镜和X 射线衍射分别对材料的抗折强度和断面的微观形貌等进行了测试和表征。结果表明: 当MMA/ MA = 9∶1 (体积比) 时复合材料抗折强度达到极大值; 随着引发剂过氧化苯甲酰(BPO) 用量的增加, 复合材料的抗折强度呈现先增大后减小的趋势; 随ZrO₂纤维含量增加, 复合材料的断裂面由平整向多层断裂变化, 材料的韧性有所提高。

Influence of process factors on the flexural strength of ZrO2( f) / PMMA PMA composites

Zirconia fiber reinforced polymethyl methacrylate polymethyl acrylate ( PMMA-PMA) mat rix composites were prepared using a suspension polymerization process. The influences of monomer ratio , initiator dosage andfiber content on the mechanical properties of the composites were particularly investigated. The flexural st rength andmicrost ructure of the composites were characterized by the universal testing machine , SEM and XRD analyses. Theresult s show that the flexural st rength of the composites reaches the optimum value when the volume ratio of methylmethacrylate and methyl acrylate (MMA/ MA) is 9∶1. With the increase of benzoyl peroxide (BPO) content , theflexural st rength of ZrO2 (f) / PMMA-PMA composites increases to a maximum and then decreases. With the increaseof ZrO2 fiber content , the morphologies of the fractured surfaces change from smooth to crapy , indicating that thetoughness of the composites is improved.