【摘要】 基于聚(N-异丙基-2-甲基丙烯酰胺)(PNiPMA)在升温和降温两个过程中测得的变温红外光谱构筑样本-样本杂合二维相关(Hybrid 2D Correlation)光谱,揭示其在热诱导相变过程中初始组分的恢复程度、相转变温度以及转变速率等物理参数的可逆性.更多还原

【Abstract】 Temperature-induced reversibility of coil-globule transition was studied for poly(N-isopropylmethacrylamide)(PNiPMA) in aqueous solutions by means of Fourier transform infrared(FTIR) spectroscopy and hybrid two-dimensional(2D) correlation spectroscopy.The degree of the symmetry along the diagonal line for PNiPMA in sample-sample(SS) hybrid two-dimensional IR correlation spectrum which was constructed from IR spectra measured in heating and cooling processes reflects the recovery rate of original species,transition temperature,and the rate of the concentration changes during the phase transition.The present study demonstrates a novel application of hybrid two-dimensional correlation spectroscopy in exploring the reversibility of phase transitions in polymer,such kind of study has a great potential application to revealing the phase transition dynamics and molecular interactions of polymers and proteins.更多还原