聚丙烯/废旧轮胎粉共混物的制备及其形态与性能

Preparation and Morphology-properties Relationship of Polypropylene/Waste Ground Rubber Tire Blends

以黏度不同的两种聚丙烯(PP)为基体,采用混沌混炼挤出机制备PP/废旧轮胎粉(WGRT)共混物,从挤出机沿程4个位置取样,观察和分析样品的相形态、流变性能和力学性能的演变。结果表明,混沌混炼有助于WGRT在基体中的分散,使挤出机沿程4个位置所取两种PP/WGRT共混物中WGRT团聚体尺寸逐渐变小,分散均匀性逐渐提高,从而使沿程所取共混物样品的复数黏度和储能模量都比相应PP的高,且低频区的复数黏度和储能模量逐渐提高。WGRT的加入明显提高了高黏度PP的冲击强度,而对低黏度PP冲击强度的提高幅度很小。

Two blends of polypropylene/waste ground rubber tire （PP/WGRT） were prepared by melt blending using a self-developed chaotic mixing extruder. Phase morphology, rheological and mechanical properties of PP/WGRT blends taken from four positions along the extruder were investigated. It was found that along the extruder the size of the WGRT agglomerates decreased and their dispersion became increasingly uniform in PP matrix due to the chaotic mixing provided by the extruder. This led to higher values of both the complex viscosity （η＊） and storage modulus （G＇） of the blend samples taken from four positions than those of the corresponding PP. The values of η and η＇ of the blend samples in the low frequency increased gradually along the extruder. The introduction of the WGRT obviously improved the impact strength of the PP with higher viscosity but slightly increased that of the PP with lower viscosity.