Competition between Physical Cross‐Linking and Phase Transition Temperature in Blends Based on Poly(N‐isopropylacrylamide‐co‐N‐ethylacrylamide) Copolymers and Carboxymethyl Cellulose,Macromolecular Chemistry and Physics

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Competition between Physical Cross‐Linking and Phase Transition Temperature in Blends Based on Poly(N‐isopropylacrylamide‐co‐N‐ethylacrylamide) Copolymers and Carboxymethyl Cellulose
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-06-25 , DOI: 10.1002/macp.202000081
Weijun Liang ₁ , Alberto García‐Peñas _{1,

2,

3} , Gaurav Sharma _{1,

2} , Amit Kumar _{1,

2} , Florian J. Stadler ₁

Affiliation

The combination of thermoresponsive polymers and biopolymers is growing due to the multiple benefits, owing to their tunable properties. Numerous works focus on the preparation of materials by chemical cross‐linking, but physical cross‐linking (based on hydrogen bonding) has not been deeply studied. In this context, questions around the hydrogen bonding of physical‐crosslinking and lower critical solution temperature (LCST) need to be addressed, especially when a second comonomer is incorporated. This study is based on the preparation of blends of poly(N‐isopropylacrylamide‐co‐N‐ethylacrylamide) copolymers and carboxymethyl cellulose (CMC) by dissolution, where the LCST‐transition and physical‐crosslinking are studied. The results show a strong effect of the comonomer on the properties in comparison with the CMC, especially for solutions of methanol/water. Low contents of N‐ethylacrylamide (NEAM) can promote physical‐crosslinking and the gelation, avoiding cononsolvency observed for homopolymers. On the other hand, NEAM will disrupt the gelation when the comonomer content is high enough.

中文翻译：

基于聚（N-异丙基丙烯酰胺-共-N-乙基丙烯酰胺）共聚物和羧甲基纤维素的共混物的物理交联和相变温度之间的竞争

由于其可调节的特性，由于具有多种益处，热响应性聚合物和生物聚合物的组合正在增长。许多工作着重于通过化学交联制备材料，但是尚未对物理交联（基于氢键）进行深入研究。在这种情况下，需要解决有关物理交联的氢键和较低的临界溶液温度（LCST）的问题，尤其是在加入第二种共聚单体时。这项研究基于聚（N-异丙基丙烯酰胺-N的共混物的制备-乙基丙烯酰胺）共聚物和羧甲基纤维素（CMC）溶解，研究了LCST过渡和物理交联。结果表明，与CMC相比，共聚单体对性能的影响很大，尤其是对于甲醇/水的溶液。低含量的N-乙基丙烯酰胺（NEAM）可以促进物理交联和凝胶化，避免了均聚物的亲和力。另一方面，当共聚单体含量足够高时，NEAM将破坏胶凝作用。

更新日期：2020-06-25

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