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Extrusion Foaming Behavior of Different Polypropylene Foaming Systems

机译：不同聚丙烯发泡体系的挤出发泡行为

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Effect of heating rates on the thermogravimetric behavior of endothermic chemical foaming agent (HP40P) and exothermic chemical foaming agent (azodicarbonamide) was studied. Extrusion foaming behaviors of linear polypropylene(LPP)/long chain branching polypropylene (LCBPP) blend and LPP/nano-clay composite were investigated. The results showed that endothermic chemical foaming agent exhibited a wide decomposition temperature range. It was necessary to increase the screw rotating speed to inhibit the decomposed gas loss when the endothermic chemical foaming was used for polypropylene foaming. The polypropylene foam with cells about 100um in size and cell density of near 106 cells/cm3 was produced by the use of LPP/LCBPP/HP40P foaming system. No serious rupture and coalescence of cells were found in the extrusion foaming of linear polypropylene/nano-clay composite. Dynamic shear rheological results showed that the linear polypropylene/nano-clay composite exhibited excellent melt elasticity.
机译：研究了加热速率对吸热化学发泡剂（HP40P）和放热化学发泡剂（氮杂羰基胺）的热重试验的影响。研究了线性聚丙烯（LPP）/长链支化聚丙烯（LCBPP）共混物和LPP /纳米粘土复合材料的挤出发泡行为。结果表明，吸热化学发泡剂表现出宽的分解温度范围。当吸热的化学发泡用于聚丙烯发泡时，有必要增加螺杆旋转速度以抑制分解的气体损失。通过使用LPP / LCBPP / HP40P发泡系统制备具有近106个细胞/ CM3的细胞大约10μm的聚丙烯泡沫。在线性聚丙烯/纳米粘土复合材料的挤出发泡中没有发现细胞的严重破裂和聚结。动态剪切流变结果表明，线性聚丙烯/纳米粘土复合材料表现出优异的熔体弹性。

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