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Effect of crosslinkers on the microstructure and swelling properties of the N-isopropyl acrylamide gels: A positron annihilation study

机译：交联剂对N-异丙基丙烯酰胺凝胶的微观结构和溶胀性能的影响：正电子an灭研究

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摘要

The Poly N-Isopropyl acrylamide (PNIPA) gels were prepared in different solvents by crosslinking with acrylate monomers of varying chain length. The microstructural characterization in terms of the free volume fractions and distributions were studied using positron annihilation lifetime spectroscopy (PALS). The equilibrium swelling of the PNIPA in distilled water was measured. An attempt has been made to understand the correlations between microscopic free volumes and the equilibrium swelling of the gels. The free volume fraction of the gels prepared in Dimethyl formamide (DMF) was directly correlated with swelling while it varied inversely with chain length of the crosslinker. The microstructure of the gels was found to be very sensitive to the solvent/medium used for polymerization. Our studies show that the swelling property is influenced by the free volumes, chain relaxation as well as the chemical nature of the cross linkers.
机译：通过与不同链长的丙烯酸酯单体交联，在不同溶剂中制备了聚N-异丙基丙烯酰胺（PNIPA）凝胶。使用正电子an没寿命谱（PALS）研究了根据自由体积分数和分布进行的微观结构表征。测量了PNIPA在蒸馏水中的平衡溶胀。已经尝试理解微观自由体积和凝胶的平衡溶胀之间的关系。在二甲基甲酰胺（DMF）中制备的凝胶的自由体积分数与溶胀直接相关，而与交联剂的链长成反比。发现凝胶的微观结构对用于聚合的溶剂/介质非常敏感。我们的研究表明，溶胀性能受自由体积，链松弛以及交联剂的化学性质影响。

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