Study of the effect of isotacticity on some physical properties of poly(N-isopropylacrylamide)

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• 作者：Chandra Sekhar Biswas ; Kheyanath Mitra ; Shikha Singh…
• 关键词：Isotactic PNIPAM ; Solubility ; Thermogravimetry ; Powder XRD ; Cloud point ; Surface tension ; Viscosity
• 刊名：Colloid & Polymer Science
• 出版年：2015
• 出版时间：June 2015
• 年：2015
• 卷：293
• 期：6
• 页码：1749-1757
• 全文大小：914 KB
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• 作者单位：Chandra Sekhar Biswas (1)
  Kheyanath Mitra (1)
  Shikha Singh (1)
  Kalyan Ramesh (2)
  Nira Misra (2)
  Biswajit Maiti (1)
  Amiya Kumar Panda (3)
  Pralay Maiti (4)
  Masami Kamigaito (5)
  Yoshio Okamoto (6)
  Biswajit Ray (1)
  
  1. Department of Chemistry, Faculty of Science, Banaras Hindu University, Varanasi, 221005, India
  2. School of Biomedical Engineering, Indian Institute of Technology - Banaras Hindu University, Varanasi, 221005, India
  3. Department of Chemistry, University of North Bengal, Darjeeling, 734013, India
  4. School of Material Science and Technology, Indian Institute of Technology - Banaras Hindu University, Varanasi, 221005, India
  5. Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
  6. Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8603, Japan
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Polymer Sciences
  Physical Chemistry
  Soft Matter and Complex Fluids
  Characterization and Evaluation Materials
  Food Science
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1435-1536

文摘

Some physical properties of high molecular weight linear poly(N-isopropylacrylamide)s (PNIPAM) having different isotacticities (m, meso dyad--7, 62, 68, 81, and 88?%) have been studied. The solubility of these polymers in different solvents varied with their isotacticity. Thermal degradation of higher isotactic polymer started slightly earlier. Cloud point of these polymers in water gradually decreased with increase in m up to 68?%. Surface tension of these polymers in N,N-dimethylformamide (DMF) was slightly lower than DMF and almost independent of their isotacticity in the temperature range of 20-0?°C. But it decreased linearly with the increase in temperature. Moreover, for all polymers, it decreased very slightly with the increase in their concentrations in the range of 0.001-.01?% (w/v). Viscosity of these polymers in DMF increased with (i) the increase in the concentration range of 1-?% (w/v), (ii) the increase in their m values, and (iii) the decrease in the temperature in the range of 20-0-sup>oC.