利用原子力显微镜对两种温敏性不同嵌段序列N-异丙基丙烯酰胺（NIPAM）与N,N-二甲基丙烯酰胺（DMA）的三嵌段共聚物P（DMA32-b-NIPAM166-b-DMA32）、P（NIPAM65-b-DMA30-b-NIPAM53）溶液的聚集形貌进行了研究,前者在15℃不同质量浓度均以单分子线团聚集,50℃时1.0 g/L形成胶束间大聚集体,直径约为3.3μm,降低质量浓度至0.1g/L及以下则形成多分子胶束,但无胶束间聚集体形成。后者在15℃、50℃,1.0 g/L质量浓度均形成胶束间聚集体,降低质量浓度至0.1 g/L、0.01 g/L则只形成多分子胶束,胶束直径约60 nm-90 nm。
The thermo-responsive behavior of triblock copolymers,P（N,N-dimethylacrylamide32-b-N-isopropylacrylamide166-b-N,N-dimethylacrylamide32（P（DMA32-b-NIPAM166-b-DMA32））and P（NIPAM65-b-DMA30-b-NIPAM53）,was investigated by dynamic laser scattering and atomic force microscopy.P（DMA32-b-NIPAM166-b-DMA32） copolymers shank as molecularly dissolved unimers at 15 ℃ with different concentrations.At 50 ℃ big aggregates（diameter： 3.3 μm） of micelles were observed in 1.0 g/L aqueous solution and the micelles were formed in 0.1 g/L or much lower concentration.At 15 ℃ and 50 ℃,P（NIPAM65-b-DMA30-b-NIPAM53） associated as aggregates of micelles in 1.0 g/L and micelles（diameter： 60 nm～90 nm） in 0.1 g/L and 0.01 g/L aqueous solution.The solution properties and morphology of these two triblock copolymers differ greatly due to their different chemical sequences.
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