改性AC发泡剂对PVC木塑复合材料性能影响

Effect of Modified AC Foaming Agent on Properties of PVC Wood-plastic Composites

采用动态热流式差示扫描量热仪对自制改性偶氮二甲酰胺（AC）发泡剂进行了分析，并研究了其用量对聚氯乙烯（PVC）木塑复合材料力学性能的影响。结果表明，该改性AC发泡剂的分解温度在165～187℃，与传统AC发泡剂相比，分解温度降低约40℃，且峰值放热量降低了39．5％；改性AC发泡剂的平均发气量为189mL／mg；扫描电子显微镜分析表明，添加1．2份改性AC发泡剂时获得的PVC木塑复合材料的泡孔致密均匀，明显优于未改性的；与未发泡的材料相比，添加1．2份改性AC发泡剂时，PVC木塑复合材料的冲击强度提高了34．6％，表观密度降低了22．5％。

Performance of homemade modified composites was studied using differential azodicarbonamide（AC） foaming agent in PVC/wood scanning calorimeter. It was shown that the decomposition temperature of modified AC foaming agent was in the range from 165 ℃ to 187 ℃. Compared with the traditional AC foaming agent, the decomposition temperature was reduced by 40 ℃ and peak exothermic was also reduced by about 39. 5 %. The average gas evolution of modified AC was 189 mL/mg . When 1. 2 phr modified AC foaming agent was used, fine and uniform pores were obtained, which was witnessed by scanning electron microscope （SEM） micrographs. Compared with unfoamed PVC/wood composites, the impact strength of foamed composites increased by 34. 6 % and apparent density decreased by 22.5 % .