Influences of water absorption on the properties of foamed poly(vinyl chloride)/rice hull composites
Influences of water absorption on the properties of foamed poly(vinyl chloride)/rice hull composites
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DOI：
10.1007/s10965-013-0172-y
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发表时间：
2013-06-01
影响因子：
2.8
通讯作者：
Pitidhammabhorn, Dhisana
中科院分区：
文献类型：
--
作者：
Petchwattana, Nawadon;Covavisaruch, Sirijutaratana;Pitidhammabhorn, Dhisana
研究了吸水率对建筑材料发泡聚氯乙烯(PVC)和稻壳复合材料物理力学性能的影响。以氧化锌改性偶氮二甲酰胺为发泡剂，发泡剂用量为0.5~2.0wt%。测定了未发泡和发泡的聚氯乙烯/稻壳复合材料在水中浸泡90天后的物理和力学性能。实验结果表明，发泡聚氯乙烯/稻壳复合材料的吸水机理符合Fickian扩散理论。由于部分聚氯乙烯添加剂的浸出，各组分的弯曲弹性模量和弯曲强度均略有提高。对发泡聚氯乙烯/稻壳复合材料表面的微观观察表明，发泡材料表面有大量的孔洞，说明水扩散到发泡复合材料中的通道。
The current study investigates the influences of water absorption on the physical and mechanical properties of foamed poly(vinyl chloride) (PVC) and rice hull composites for building material application. Zinc oxide-modified azodicarbonamide was used as a blowing agent; its contents were varied from 0.5 to 2.0 wt%. Physical and mechanical properties of the unfoamed and foamed PVC/rice hull composites were determined after they had been immersed in water for a maximum duration of 90 days. Experimental results indicated that the water absorption mechanism of foamed PVC/rice hull composites followed the kinetics of Fickian diffusion theory. Slight increases in both the flexural modulus and the flexural strength were observed in all compositions due to the leaching of some PVC additives. Microscopic observation on the surfaces of the foamed PVC/rice hull composites revealed abundant surface openings depicting the passages of water diffused into the PVC/rice hull foamed composites.