To investigate the effects of incorporating gas and the associated influencing factors on polymer melt, a method of evaluating the gas-laden ability using modified rheometric measurements was proposed. In this study, common and widely used thermoplastic materials—polypropylene (PP) and high-density polyethylene (HDPE), and their blends with different weight ratios—were selected, and the rheological properties of neat melt and gas-laden melts were tested using a modified torque rheometer. The foamed samples were also produced using a regular injection-molding machine, and the foamed morphology was examined by scanning electron microscope (SEM). The comparison of rheological curves of neat melt and gas-laden melt indicated that the incorporation of gas influenced the rheological properties of the gas-laden polymer melts as evidenced by a decrease of zero-rotational torque and an increase in the melt flow index. The results also suggested that the gas-laden ability of polymer melt could be evaluated quantitatively by the decay (due to desorption) of gas using the modified rheological measurement method. This study also demonstrated that the gas-laden ability can be used to predict the foaming behavior of polymer melts.

为了研究掺入气体和相关影响因素对聚合物熔体的影响，提出了一种使用改进的流变测量方法评估载气能力的方法。在这项研究中，选择了常用和广泛使用的热塑性材料-聚丙烯（PP）和高密度聚乙烯（HDPE），以及它们具有不同的重量比的共混物，并使用以下方法测试了纯熔体和含气熔体的流变性能改进的扭矩流变仪。还使用常规注塑机生产泡沫样品，并通过扫描电子显微镜（SEM）检查泡沫形态。纯熔体和含气熔体的流变曲线比较表明，气体的掺入影响了含气聚合物熔体的流变性质，这是零旋转扭矩的减小和熔体流动指数的增加所证明的。结果还表明，可以使用改进的流变测量方法通过气体的衰减（由于解吸）来定量评估聚合物熔体的载气能力。这项研究还表明，载气能力可用于预测聚合物熔体的发泡行为。