Lebar A, Kutnjak Z, Zumer S, Finkelmann H, Sánchez-Ferrer A, Zalar B
J. Stefan Institute, Ljubljana, Slovenia.
Phys Rev Lett. 2005 May 20;94(19):197801. doi: 10.1103/PhysRevLett.94.197801. Epub 2005 May 16.
Temperature profiles of the first and the second moment of the nematic order parameter distribution function, as determined from the deuteron nuclear magnetic resonance line shapes, as well as heat capacity response, provide support for the supercritical scenario of the nematic-paranematic phase transition in liquid single crystal elastomers. The relative strength of the locked-in internal mechanical field with respect to the critical field can be decreased by swelling the elastomer samples with low molecular mass nematogen. By increasing the concentration of the dopant, critical and below-critical behavior is promoted.
由氘核核磁共振线形确定的向列序参数分布函数的一阶和二阶矩的温度分布，以及热容量响应，为液体单晶弹性体中向列-顺向列相转变的超临界情形提供了支持。通过用低分子量向列型液晶溶胀弹性体样品，可以降低锁定内部机械场相对于临界场的相对强度。通过增加掺杂剂浓度，可促进临界和亚临界行为。
