Abstract The main purpose of this work present a novel method for preparation of the polypropylene/polybutadiene/polyacrylamide (PP/PB/PAM) blends induced by pre-irradiation, the grafting reaction was conducted and completed before melting of the PP, and the formed grafted polymers served as the compatibilizer to enhance uniform dispersion in the melting stage subsequently. The EPR analysis manifests that there was peroxide on the PP powders after irradiation, which decomposed and induced grafting reaction when elevating temperature over 80 °C. The DSC and POM also demonstrated that the crystallization enhancement resulted from the heterogeneous nucleation attributed to both the grafted chains and their interactions. The hydrogen bonding interactions also assisted to construct the heterogeneous network structure in the melts appearing the nonlinear rheological behavior, and exhibited improved melt properties such as strain hardening and shear thinning like that of LCBPP's. Moreover, FTIR analysis confirms that H-bond interactions existed in the melts, their intensity and strength depend on both the PAM content and temperature. Having enhanced the melt strength and elasticity for the network structure in the melt, the PP/PB/PAM blends present well foaming performance especially in the sc-CO2 with water process. The foams are obviously improved in the morphology and uniformity, and with much thinner cell walls, which originates from strengthening cell nucleation and plasticization after incorporation of the PAM. It is possible to tailor the linear polypropylene in a simple and practical way, which might broaden the field of possible applications and make light-weight PP a more competitive comparing to conventional used LCBPPs.

中文翻译：

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预辐照反应共混制备长支链聚丙烯共混物

摘要 本工作的主要目的是提出一种制备聚丙烯/聚丁二烯/聚丙烯酰胺（PP/PB/PAM）共混物的新方法，通过预辐照，在聚丙烯熔融前进行接枝反应并完成，形成的聚丙烯/聚丁二烯/聚丙烯酰胺（PP/PB/PAM）共混物。接枝聚合物用作增容剂以增强随后熔融阶段的均匀分散。EPR分析表明，辐照后的PP粉体上存在过氧化物，当温度升高到80℃以上时会分解并引发接枝反应。DSC 和 POM 还表明结晶增强是由归因于接枝链及其相互作用的异相成核引起的。氢键相互作用还有助于在熔体中构建呈现非线性流变行为的异质网络结构，并表现出改善的熔体特性，如 LCBPP 的应变硬化和剪切变稀。此外，FTIR 分析证实熔体中存在氢键相互作用，其强度和强度取决于 PAM 含量和温度。PP/PB/PAM 共混物提高了熔体中网络结构的熔体强度和弹性，具有良好的发泡性能，尤其是在 sc-CO2 与水工艺中。泡沫的形态和均匀性得到明显改善，泡孔壁更薄，这是由于加入PAM后增强了泡孔成核和塑化作用。