Characterization of the LCST behaviour of aqueous poly(N-isopropylacrylamide) solutions by thermal and cloud point techniques
Characterization of the LCST behaviour of aqueous poly(N-isopropylacrylamide) solutions by thermal and cloud point techniques
复制标题
DOI：
10.1016/s0032-3861(97)01024-0
复制
发表时间：
1997-05-01
期刊：
影响因子：
4.6
通讯作者：
Kiparissides, C
中科院分区：
文献类型：
--
作者：
Boutris, C;Chatzi, EG;Kiparissides, C
为了定量研究测量条件对所报道的相分离温度的影响，对低分子量PNIPA水溶液的相分离行为进行了系统的研究，所报道的相分离温度与三种技术有关，即差示扫描量热法、光学浊点和紫外比浊法。PNIPA浓度在0.5-22重量%的范围内变化。所有这三种技术都产生了相当的相分离温度，独立于过渡动力学，只要实验的时间尺度足够大以确保接近平衡条件。(C)1997年爱思唯尔科学有限公司
A systematic investigation of the phase separation behaviour of aqueous low molecular weight PNIPA solutions was carried out in order to quantitatively investigate the effect of measurement conditions on the reported phase separation temperatures in relation to three techniques, namely, differential scanning calorimetry, optical cloud point and u.v. turbidimetry. The PNIPA concentration was varied in the range 0.5-22 wt%. All three techniques yielded comparable phase separation temperatures, independently of the transition kinetics, provided that the time scale of the experiments is large enough to ensure close to equilibrium conditions. (C) 1997 Elsevier Science Ltd.