Study On Mechanical And Aging Performances Of Nano ZnO/UPR Composites

Unsaturated polyester resin (UPR) is good in mechanical, electrical properties and chemical erosion resistance. It hasn't been widely used in many areas because of its bad shrinkage and toughness. To meet various applications, new types of resins with environmental protection and multifunction are widely studied and developed.In this paper, Nano ZnO/UP was synthesized. The influence of nano ZnO on mechanical and aging properties is studied.By orthogonal experiments methods, optimized ratio under the experimental condition is: the molar ratio of diacid and diol is 1:1, the molar ratio of glycol and propanediol is 1:1, the styrene content is 33wt%, the amount of benzylperoxide (BPO) is 0.9wt%. The variance analysis shows that molar ratio of diacid and diol for bending strength of composites are highly remarkable factor, styrene content is remarkable factor.Bending strength is increased 5.9% and the impact strength is increased 40% for UPR composites after adding 6 wt% ZnO. Impact fracture morphology is brittle for UPR composites with 2wt% ZnO and typical tough for that with 6wt% ZnO.The long-term artificial accelerated aging experiment indicates that bending strength for UPR with 6wt% ZnO maintains 96.1% and increases 13.7% compared to pure UPR after 920h irradiated with xenon lamp and bending strength maintains 99.7% and increases 9.6%, compared to pure UPR after 80 times humidity-heat cycle.The decomposition process of nano ZnO/UPR composites is researched by TG-DSC thermal analysis. Thermal stability 30% mass loss for composites is decreased, thermal stability 50% mass loss for composites is increased. NanoZnO can catalyze the decomposition of ZnO/UPR composites.