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On the Thermoresponsivity and Scalability of N,N‐Dimethylacrylamide Modified NIPAM Microgels
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-03-23 , DOI: 10.1002/macp.202000018 Daniel Zehm 1 , Antje Lieske 1 , Andrea Stoll 2
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-03-23 , DOI: 10.1002/macp.202000018 Daniel Zehm 1 , Antje Lieske 1 , Andrea Stoll 2
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Various thermoresponsive copolymer microgels based on N‐isopropylacrylamide (NIPAM) and N,N‐dimethylacrylamide (DMAAm) are prepared using either precipitation polymerization (PP) or inverse emulsion polymerization (IEP). The comparison of the volume phase transition temperature (VPTT) for PNIPAMn‐co‐PDMAAmm copolymer microgels prepared by PP or IEP reveals significant differences. Empirically, PP leads to lower VPTTs than IEP for identical monomer composition, whereby the observed difference in the VPTT becomes greater the higher the DMAAm content of the monomer mixture is. Presumably this is because IEP confers a higher homogeneity of the crosslinking and polymer segmental density within the microgel particles, resulting in a linear correlation of the VPTT as a function of DMAAm. Further, the scalability of an IEP process for the synthesis of NIPAM0.86‐co‐PDMAAm0.14 containing 14% DMAAm is studied, since these microgels exhibit a VPTT in the targeted range of 37.5–38.5 °C. The study reveals that the temperature increase due to insufficient dissipation of the heat of polymerization in a batch IEP process on a larger scale affects the VPTT, leading to microgels with a VPTT of about 35.5 °C. By contrast, when conducted as semibatch IEP process with more efficient heat removal, particles with a VPTT of 38.4 °C are obtained also on larger scale.
中文翻译：
N，N-二甲基丙烯酰胺修饰的NIPAM微凝胶的热响应性和可扩展性
使用沉淀聚合（PP）或反相乳液聚合（IEP）制备各种基于N-异丙基丙烯酰胺（NIPAM）和N，N-二甲基丙烯酰胺（DMAAm）的热敏共聚物微凝胶。PNIPAM n - co- PDMAAm m的体积相变温度（VPTT）的比较PP或IEP制备的共聚物微凝胶显示出显着差异。根据经验，对于相同的单体组成，PP导致的VPTT低于IEP，因此，单体混合物中DMAAm含量越高，观察到的VPTT差异就越大。据推测这是因为IEP赋予了微凝胶颗粒更高的交联均匀性和聚合物片段密度，从而导致VPTT与DMAAm呈线性相关。此外，用于合成NIPAM 0.86 - co- PDMAAm 0.14的IEP过程的可扩展性研究了含14％DMAAm的微凝胶，因为这些微凝胶在37.5–38.5°C的目标温度范围内表现出VPTT。研究表明，由于间歇式IEP工艺中聚合热的耗散不足而导致的温度升高会影响VPTT，从而导致VPTT约为35.5°C的微凝胶。相比之下，当以具有更有效除热功能的半间歇式IEP工艺进行时，也可以大规模获得VPTT为38.4°C的颗粒。
更新日期：2020-03-23
中文翻译：
N，N-二甲基丙烯酰胺修饰的NIPAM微凝胶的热响应性和可扩展性
使用沉淀聚合（PP）或反相乳液聚合（IEP）制备各种基于N-异丙基丙烯酰胺（NIPAM）和N，N-二甲基丙烯酰胺（DMAAm）的热敏共聚物微凝胶。PNIPAM n - co- PDMAAm m的体积相变温度（VPTT）的比较PP或IEP制备的共聚物微凝胶显示出显着差异。根据经验，对于相同的单体组成，PP导致的VPTT低于IEP，因此，单体混合物中DMAAm含量越高，观察到的VPTT差异就越大。据推测这是因为IEP赋予了微凝胶颗粒更高的交联均匀性和聚合物片段密度，从而导致VPTT与DMAAm呈线性相关。此外，用于合成NIPAM 0.86 - co- PDMAAm 0.14的IEP过程的可扩展性研究了含14％DMAAm的微凝胶，因为这些微凝胶在37.5–38.5°C的目标温度范围内表现出VPTT。研究表明，由于间歇式IEP工艺中聚合热的耗散不足而导致的温度升高会影响VPTT，从而导致VPTT约为35.5°C的微凝胶。相比之下，当以具有更有效除热功能的半间歇式IEP工艺进行时，也可以大规模获得VPTT为38.4°C的颗粒。
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