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Supercritical CO2 foaming and shrinkage resistance of thermoplastic polyurethane/modified magnesium borate whisker composite
Journal of CO2 Utilization ( IF 7.2 ) Pub Date : 2022-01-13 , DOI: 10.1016/j.jcou.2022.101887
Xiulu Gao 1 , Yichong Chen 1 , Peng Chen 1 , Zhimei Xu 1 , Ling Zhao 1, 2 , Dongdong Hu 1
Affiliation  

Thermoplastic polyurethane (TPU) foam is eco-friendly prepared with supercritical carbon dioxide (CO2) as a blowing agent. Magnesium borate whisker (Mg2B2O5) modified by borate ester coupling agent (BE) (BE-Mg2B2O5) was introduced into TPU to modulate cell nucleation, bubble growth and foam stabilization depending on the intercalation structure of Mg2B2O5, entanglement effect of BE and increased physical crosslinking density. The modulation of Mg2B2O5 on the hard segment crystallization promoted hard segment’s (HS) microstructure, i.e., physical crosslinking density. The addition of BE-Mg2B2O5 enhanced the rheological properties, maximum tensile strength and elongation at break of TPU composites. Excellent mechanical property and strain-hardening behavior of TPU composites improved the foamability of TPU composites. Mg2B2O5 and entanglement points acted as heterogeneous nucleation sites to momentously increase cell density and reduce bubble size. Intercalation structure of Mg2B2O5, entanglement effect of BE and high physical crosslinking density effectively limited the TPU relaxation and memory recovery. BE-Mg2B2O5 around the cell wall acted as a barrier to slow down the diffusion rate of CO2 from inside the bubble to outside. The dual action synergistically reduced the shrinkage of TPU foam.



中文翻译:

热塑性聚氨酯/改性硼酸镁晶须复合材料的超临界CO2发泡和抗收缩性

热塑性聚氨酯 (TPU) 泡沫是以超临界二氧化碳 (CO 2 ) 作为发泡剂制备的环保型。将硼酸酯偶联剂 (BE) (BE-Mg 2 B 2 O 5 ) 改性的硼酸镁晶须 (Mg 2 B 2 O 5 ) 引入 TPU 中,根据其插层结构调节泡孔成核、气泡生长和泡沫稳定化。 Mg 2 B 2 O 5,BE的缠结效应和增加的物理交联密度。Mg 2 B 2 O 5的调制硬链段结晶促进了硬链段(HS)的微观结构,即物理交联密度。添加BE-Mg 2 B 2 O 5增强了TPU复合材料的流变性能、最大拉伸强度和断裂伸长率。TPU复合材料优异的力学性能和应变硬化行为提高了TPU复合材料的发泡性。Mg 2 B 2 O 5和纠缠点充当异质成核位点,以显着增加细胞密度并减小气泡尺寸。Mg 2 B 2 O 5的插层结构,BE的缠结效应和高物理交联密度有效地限制了TPU松弛和记忆恢复。细胞壁周围的BE-Mg 2 B 2 O 5起到了减缓CO 2从气泡内向外扩散速度的屏障的作用。双重作用协同降低了 TPU 泡沫的收缩率。

更新日期:2022-01-13
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