Influence of high-pressure on cononsolvency of poly(N-isopropylacrylamide) nanogels in water/methanol mixtures

被引：23
|
作者：
Hofmann, Christian H. [1 ]
Grobelny, Sebastian [2 ]
Erlkamp, Mirko [2 ]
Winter, Roland [2 ]
Richtering, Walter [1 ]
机构：
[1] Rhein Westfal TH Aachen, Inst Phys Chem, D-52056 Aachen, Germany
[2] TU Dortmund Univ, Dept Chem & Chem Biol, D-44227 Dortmund, Germany
来源：
POLYMER | 2014年 / 55卷 / 08期
关键词：
Lower critical solution temperature; Microgel; Phase behaviour; VOLUME-PHASE-TRANSITION; N-ISOPROPYLACRYLAMIDE GELS; COIL-GLOBULE TRANSITION; FTIR-SPECTROSCOPY; AQUEOUS-SOLUTIONS; HYDROSTATIC-PRESSURE; MICROGEL PARTICLES; MIXED-SOLVENTS; TO-GLOBULE; WATER;
D O I：
10.1016/j.polymer.2014.03.006
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
We show that the temperature-induced collapse of poly(N-isopropylacrylamide) (PNiPAm) nanogels in water/methanol mixtures can be reversed by excess hydrostatic pressure. Small angle X-ray scattering (SAXS) results reveal that first a swollen surface layer is established and then the particles swell homogeneously. A threshold pressure needed for rewelling fully collapsed nanogels indicates that hydrophobic interactions inside the nanogel have to be compensated to form a swollen surface layer. The size change is related to a change in polymer solvation detected by infrared (IR) spectroscopy. Pressure favours polymer/water hydrogen bonds to the cost of methanol/polymer bonds so that water is enriched inside the nanogel. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2000 / 2007
页数：8
相关论文
共 50 条
  • [31] Phase behavior of poly(N-isopropylacrylamide) in water-methanol cononsolvent mixtures and its relevance to membrane formation
    Tao, CT
    Young, TH
    [J]. POLYMER, 2005, 46 (23) : 10077 - 10084
  • [32] Reentrant behavior of poly(N-isopropylacrylamide) brushes in water-methanol mixtures investigated with a quartz crystal microbalance
    Liu, GM
    Zhang, GZ
    [J]. LANGMUIR, 2005, 21 (05) : 2086 - 2090
  • [33] SWELLING BEHAVIORS OF POLY(N-ISOPROPYLACRYLAMIDE) GEL IN POLY(ETHYLENE GLYCOL) - WATER MIXTURES
    ISHIDAO, T
    AKAGI, M
    SUGIMOTO, H
    IWAI, Y
    ARAI, Y
    [J]. MACROMOLECULES, 1993, 26 (26) : 7361 - 7362
  • [34] Toxicology and safety research of poly(N-isopropylacrylamide)-based thermosensitive nanogels
    Li, Han
    Sun, Haixia
    Liu, Yuyu
    Yuan, Binghan
    Hu, Jingyuan
    Jiang, Yunzhe
    Li, Qingkai
    Cao, Suilan
    Liu, Hong
    Xiao, Baiquan
    Shi, Peng
    Yang, Xiangliang
    Wang, Shaobin
    Zhao, Yongsheng
    [J]. ENVIRONMENTAL SCIENCE-NANO, 2023, 10 (12) : 3357 - 3365
  • [35] Botryoidal assembly of cholesteryl-pullulan/poly(N-isopropylacrylamide) nanogels
    Morimoto, Nobuyuki
    Winnik, Francoise M.
    Akiyoshi, Kazunari
    [J]. LANGMUIR, 2007, 23 (01) : 217 - 223
  • [36] Effect of Temperature on the Cononsolvency of Poly(N-isopropylacrylamide) (PNIPAM) in Aqueous 1-Propanol
    Perez-Ramirez, H. A.
    Haro-Perez, C.
    Odriozola, G.
    [J]. ACS APPLIED POLYMER MATERIALS, 2019, 1 (11) : 2961 - 2972
  • [37] Enhancing Gene-Knockdown Efficiency of Poly(N-isopropylacrylamide) Nanogels
    Deshpande, Sonal
    Patil, Smita
    Singh, Neetu
    [J]. ACS OMEGA, 2018, 3 (07): : 8042 - 8049
  • [38] Controlled protein adsorption and delivery of thermosensitive poly(N-isopropylacrylamide) nanogels
    Wu, Yuzheng
    Li, Haifeng
    Rao, Zhouquan
    Li, Huaqiang
    Wu, Yan
    Zhao, Jianhao
    Rong, Jianhua
    [J]. JOURNAL OF MATERIALS CHEMISTRY B, 2017, 5 (39) : 7974 - 7984
  • [39] Water Dynamics in a Concentrated Poly(N-isopropylacrylamide) Solution at Variable Pressure
    Niebuur, Bart-Jan
    Lohstroh, Wiebke
    Appavou, Marie-Sousai
    Schulte, Alfons
    Papadakis, Christine M.
    [J]. MACROMOLECULES, 2019, 52 (05) : 1942 - 1954
  • [40] Temperature-sensitive nanogels: poly(N-vinylcaprolactam) versus poly(N-isopropylacrylamide)
    Ramos, Jose
    Imaz, Ainara
    Forcada, Jacqueline
    [J]. POLYMER CHEMISTRY, 2012, 3 (04) : 852 - 856
12345