改性AC发泡剂对PVC木塑复合材料力学性能影响

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189 mL/mg；扫描电子显微镜分析表明，使用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，明显优于使用未改性AC发泡剂的情况；与未发泡的材料相比，使用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 ％。

Effect of Modified AC Foaming Agent

Performance of homemade modified azodicarbonamide(AC) foaming agent in PVC/wood composites was studied using differential 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 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 un-foamed PVC/wood composites, the impact strength of foamed composites increased by 34.6 % and apparent density decreased by 22.5 %