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以含聚异丙二醇(PPG)链段的聚醚胺和己二酸为原料,合成了温度响应性聚酰胺APA;FT-IR和GPC的结果表明合成产物具有酰胺结构的聚合物;Micro-DSC和变温紫外测试的结果表明,合成的APA具有33℃的最低临界互溶温度;TEM和AFM的结果表明当组装体溶液浓度为1 mg/m L时,APA在常温下可以组装成长纤维,其形成经历了“胶束-胶束多聚体-胶束融合-长纤维”等多级自组装过程.而当温度升为60℃,这些长纤维会转变为平均螺距为35 nm的螺旋纤维.螺旋纤维的形成本质上是当温度高于LCST时,APA纤维中的PPG链段坍塌,从而诱导纤维发生扭转,最终导致螺旋结构的出现.
The temperature-responsive polyamide APA was synthesized from polyetheramine and adipic acid containing polyisopropylene glycol (PPG) segments. The results of FT-IR and GPC showed that the synthesized product had amide structure. The micro-DSC and The result of temperature-variable UV test showed that the synthesized APA had the lowest critical melting temperature of 33 ℃. The results of TEM and AFM showed that the APA could grow into long fibers at room temperature when the concentration of the assembly was 1 mg / m L, Micelles - micellar multimers - micellar fusion - long fibers "and other multi-stage self-assembly process.When the temperature rises to 60 ℃, these long fibers will be transformed into an average pitch of 35 nm helical fibers. The formation of helical fibers is essentially that when the temperature is higher than the LCST, the PPG segments in the APA fibers collapse, inducing the fibers to twist, eventually leading to the appearance of a helical structure.