Cross-linking of carboxyl-terminated nitrile rubber with polyhedral oligomeric silsesquioxane

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• 作者：Raneesh Konnola ; C. P. Reghunadhan Nair…
• 关键词：Polyhedral oligomeric silsesquioxane ; Carboxyl ; terminated poly(acrylonitrile ; co ; butadiene) ; Cure kinetics ; DSC
• 刊名：Journal of Thermal Analysis and Calorimetry
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：123
• 期：2
• 页码：1479-1489
• 全文大小：1,849 KB
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• 作者单位：Raneesh Konnola (1)
  C. P. Reghunadhan Nair (2)
  Kuruvilla Joseph (1)
  
  1. Department of Chemistry, Indian Institute of Space Science and Technology, Thiruvananthapuram, Kerala, 695547, India
  2. Polymers and Special Chemicals Group, Vikram Sarabhai Space Centre, Thiruvananthapuram, Kerala, 695 022, India
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Sciences
  Polymer Sciences
  Physical Chemistry
  Inorganic Chemistry
  Measurement Science and Instrumentation
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1572-8943

文摘

Glycidyl polyhedral oligomeric silsesquioxane (POSS) was used as a cross-linking agent to prepare a new organic–inorganic hybrid material from carboxyl-terminated poly(acrylonitrile-co-butadiene) (CTBN). The structure of the reacted material was characterized by Fourier transform infrared spectroscopy. Differential scanning calorimetry (DSC) at different heating rates in the presence and absence of catalyst, triphenyl phosphine (TPP), was conducted to investigate the curing kinetics. The reaction is catalyzed by the addition of TPP, and rate is maximum at higher catalyst concentrations. Different kinetic models were used to analyze the kinetic parameters. The effect of catalyst on curing process was determined by calculating the activation energy (E _a) using Kissinger method. Dependency of E _a with extent of conversion was monitored by different isoconversional methods. The curing mechanism of POSS–CTBN system followed autocatalytic model. Moreover, the predicted curves from the kinetic models fit well with the non-isothermal DSC curve. The E _a of gelation obtained from rheological studies matched with that from DSC study, in league with the Flory’s theory of cross-linking. Keywords Polyhedral oligomeric silsesquioxane Carboxyl-terminated poly(acrylonitrile-co-butadiene) Cure kinetics DSC