Association of Thermoresponsive Diblock Copolymer PDEGMA-b-PDIPAEMA in Aqueous Solutions: The Influence of Terminal Groups

被引:0
|
作者
Skorna, Adam [1 ]
Selianitis, Dimitrios [2 ]
Pispas, Stergios [2 ]
Stepanek, Miroslav [1 ]
机构
[1] Charles Univ Prague, Fac Sci, Dept Phys & Macromol Chem, Hlavova 2030, Prague 12840, Czech Republic
[2] Natl Hellen Res Fdn, Theoret & Phys Chem Inst, 48 Vassileos Constantinou Ave, Athens 11635, Greece
关键词
thermoresponsive polymers; pH-responsive polymers; block copolymers; association; MICELLES; DYNAMICS; INSIGHT; DESIGN;
D O I
10.3390/polym16152102
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Aqueous solutions of a thermoresponsive diblock copolymer poly(di-[ethylene glycol] methyl ether methacrylate)-b-poly(2-[diisopropylamino] ethyl methacrylate) (PDEGMA-b-PDIPAEMA) were studied by static, dynamic and electrophoretic light scattering, small-angle X-ray scattering and differential scanning calorimetry. Thermoresponsive behavior of PDEGMA-b-PDIPAEMA was investigated at two pH values, pH = 2, at which the terminal carboxylic group of the PDEGMA chain and the PDIPAEMA block are protonated, and pH = 7, where the carboxyl terminal group is ionized while the PDIPAEMA block is partially deprotonated and more hydrophobic. Both at pH = 2 and 7, PDEGMA-b-PDIPAEMA copolymer underwent extensive association (the size of the aggregates was between 100 and 300 nm), indicating strong interchain interactions. While the measurements confirmed thermoresponsive behavior of PDEGMA-b-PDIPAEMA at pH = 7, no changes in the association with temperature were observed at pH 2 as the thermoresponsivity of PDEGMA was suppressed by hydrogen bonding between carboxylic groups and PDEGMA segments, as well as due to the increased hydrophilicity of the PDIPAEMA block. Fluorescence measurements with pyrene as a fluorescent probe showed that both at pH = 2 and pH = 7 the associates were able to solubilize hydrophobic substances.
引用
收藏
页数:12
相关论文
共 13 条
  • [1] Effects of subphase pH and temperature on the interfacial behavior of double hydrophilic diblock copolymer PDEGMA-b-PDIPAEMA
    Li, Jian
    Wen, Gangyao
    Selianitis, Dimitrios
    Pispas, Stergios
    Zhang, Yu
    Li, Hongfei
    [J]. JOURNAL OF APPLIED POLYMER SCIENCE, 2024, 141 (05)
  • [2] PDEGMA-b-PDIPAEMA copolymers via RAFT polymerization and their pH and thermoresponsive schizophrenic self-assembly in aqueous media
    Selianitis, Dimitrios
    Pispas, Stergios
    [J]. JOURNAL OF POLYMER SCIENCE, 2020, 58 (13) : 1867 - 1880
  • [3] Anomalous transition in aqueous solutions of a thermoresponsive amphiphilic diblock copolymer
    Zhu, Kaizheng
    Jin, Huiting
    Kjoniksen, Anna-Lena
    Nystroem, Bo
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 2007, 111 (37): : 10862 - 10870
  • [4] Association in aqueous solutions of a thermoresponsive PVCL-g-C11EO42 copolymer
    Kjoniksen, AL
    Laukkanen, A
    Galant, C
    Knudsen, KD
    Tenhu, H
    Nyström, B
    [J]. MACROMOLECULES, 2005, 38 (03) : 948 - 960
  • [5] Association behavior of diblock (oxyethylene/oxybutylene) copolymer E18B10 in aqueous solution
    Kelarakis, A
    Havredaki, V
    Booth, C
    Nace, VM
    [J]. MACROMOLECULES, 2002, 35 (14) : 5591 - 5594
  • [6] Association properties of a high molecular weight poly(propylene oxide–b–ethylene oxide) diblock copolymer in aqueous solution
    S. Rangelov
    P. Petrov
    I. Berlinova
    Ch. Tsvetanov
    [J]. Polymer Bulletin, 2004, 52 : 155 - 161
  • [7] Influence of cleavage of photosensitive group on thermally induced micellization and gelation of a doubly responsive diblock copolymer in aqueous solutions: A SANS study
    He, Lilin
    Hu, Bin
    Henn, Daniel M.
    Zhao, Bin
    [J]. POLYMER, 2016, 105 : 25 - 34
  • [8] Association properties of a high molecular weight poly(propylene oxide-b-ethylene oxide) diblock copolymer in aqueous solution
    Rangelov, S
    Petrov, P
    Berlinova, I
    Tsvetanov, C
    [J]. POLYMER BULLETIN, 2004, 52 (02) : 155 - 161
  • [9] Temperature-induced self-association of doubly thermosensitive diblock copolymers with pendant methoxytris(oxyethylene) groups in dilute aqueous solutions
    Hua, Fengjun
    Jiang, Xueguang
    Zhao, Bin
    [J]. MACROMOLECULES, 2006, 39 (10) : 3476 - 3479
  • [10] Association properties of diblock copolymer of ethylene oxide and 1,2-butylene oxide:: E17B12 in aqueous solution
    Chaibundit, C
    Sumanatrakool, P
    Chinchew, S
    Kanatharana, P
    Tattershall, CE
    Booth, C
    Yuan, XF
    [J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2005, 283 (02) : 544 - 554