This is a review article focused on publications that appeared in 2019 to serve as a critical assessment and summary of observations of the most recent trends in polymer foaming research with the physical blowing agent carbon dioxide. The factors that drive research along with the challenges and approaches to address them to advance the field are presented as they pertain to foaming of (1) biodegradable polymers, (2) polyurethanes, (3) commodity polymers, as well as the (4) generation of functionally gradient foams, (5) development of unique experimental systems, and (6) efforts directed on modeling. Critical perspectives are provided on how the polymer foam morphology is modulated or altered by polymer structure, polymer crystallinity, nucleating agents, or degree of curing.

这是一篇评论文章，重点介绍了2019年出现的出版物，这些出版物对使用物理发泡剂二氧化碳的聚合物发泡研究的最新趋势进行了重要评估和观察总结。提出了推动研究的因素以及解决该问题的方法和方法，以推动该领域的发展，因为它们涉及（1）可生物降解的聚合物，（2）聚氨酯，（3）商品聚合物以及（4）的发泡。功能梯度泡沫的产生，（5）独特的实验系统的开发以及（6）建模方面的努力。提供了关于如何通过聚合物结构，聚合物结晶度，成核剂或固化程度调节或改变聚合物泡沫形态的关键观点。