Mechanical and Swelling Behaviors of End-Linked PDMS Rubber and Randomly Cross-Linked Polyisoprene
Mechanical and Swelling Behaviors of End-Linked PDMS Rubber and Randomly Cross-Linked Polyisoprene
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DOI：
10.1021/ma302335u
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发表时间：
2013-02
期刊：
影响因子：
5.5
通讯作者：
Ben Xu;Jinrong Wu;G. McKenna
中科院分区：
文献类型：
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作者：
Ben Xu;Jinrong Wu;G. McKenna
在目前的工作中，我们报告的膨胀活性参数S，或膨胀模量，这代表了交联和未交联的系统之间的自由能的差异，PDMS和聚异戊二烯的弗伦克尔-弗洛里-勒纳（FFR）理论的框架内的温度和交联密度的依赖性的调查结果。我们发现，S（λ2 → 1）（其中λ是膨胀伸展）的值不为零，并且随着交联密度的增加而增加，这意味着代表散布聚合物和溶剂分子的能量贡献的Flory-Huggins相互作用参数，交联（χc）和未交联（χu）系统是不同的。FFR模型中S与λs2的全面分析还得出了新的结果，即χc和χu之间的差异随着肿胀程度的增加而减小。还介绍了PDMS端部连接网络的网络弹性测定的扭转测量结果。
In the present work, we report the results of an investigation of the temperature and cross-link density dependences of the swelling activity parameter S, or dilational modulus, which represents a difference in free energy between the cross-linked and the uncross-linked systems, for PDMS and polyisoprene within the framework of the Frenkel–Flory–Rehner (FFR) theory. We find that the values of S (λ2 → 1), where λ is the swelling stretch, are nonzero and increase as the cross-linking density increases, implying that the Flory–Huggins interaction parameters, which represents the energy contribution from interspersing polymer and solvent molecules, of the cross-linked (χc) and uncross-linked (χu) systems are different. The full analysis of S vs λs2 within the FFR model also leads to the new result that the difference between χc and χu decreases as the degree of swelling increases. Results from torsional measurements for network elasticity determination of the PDMS end-linked networks are also presented.