Oyerokun Folusho T, Schweizer Kenneth S
Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois, 1304 West Green Street, Urbana, Illinois 61801, USA.
J Phys Chem B. 2005 Apr 14;109(14):6595-603. doi: 10.1021/jp045646i.
A microscopic polymer liquid-state theory has been developed for the structure, thermodynamics and mechanical properties of strained liquid crystalline elastomers. The theory captures the experimentally observed phenomenon of spontaneous distortion and establishes a direct correlation between it and the nematic order parameter. Strain induced softening of the elastic modulus is predicted to emerge due to coupling of the induced orientational order and anisotropic interchain excluded volume interactions. Comparison of our results with limited experiments shows good qualitative and sometimes quantitative agreement. The theory predicts that deformation in the liquid crystalline state results in an increase of the amplitude of density fluctuations (compressibility) which becomes more pronounced as chain degree of polymerization and/or segmental density are decreased.
针对应变液晶弹性体的结构、热力学和力学性能，已发展出一种微观聚合物液态理论。该理论捕捉到了实验观察到的自发畸变现象，并建立了它与向列序参数之间的直接关联。由于诱导取向序与链间各向异性排除体积相互作用的耦合，预计会出现应变诱导的弹性模量软化。将我们的结果与有限的实验进行比较，显示出良好的定性一致性，有时还有定量一致性。该理论预测，液晶态下的变形会导致密度涨落幅度（压缩性）增加，随着聚合度和/或链段密度降低，这种增加会变得更加明显。
