Yang DaEun, Seo Kyutae, Kang Hyo
BK-21 Four Graduate Program, Department of Chemical Engineering, Dong-A University, 37 Nakdong Daero 550beon-gil, Saha-gu, Busan 604-714, Korea.
Polymers (Basel). 2021 Feb 12;13(4):547. doi: 10.3390/polym13040547.
We synthesized a series of renewable and plant-based isoeugenol-substituted polystyrenes (PIEU#, # = 100, 80, 60, 40, and 20, where # is the molar percent content of isoeugenol moiety), using polymer modification reactions to study their liquid crystal (LC) alignment behavior. In general, the LC cells fabricated using polymer film with a higher molar content of isoeugenol side groups showed vertical LC alignment behavior. This alignment behavior was well related to the surface energy value of the polymer layer. For example, vertical alignments were observed when the polar surface energy value of the polymer was smaller than approximately 3.59 mJ/m, generated by the nonpolar isoeugenol moiety with long and bulky carbon groups. Good alignment stability at 100 °C and under ultraviolet (UV) irradiation of 15 J/cm was observed for the LC cells fabricated using PIEU100 as a LC alignment layer. Therefore, renewable isoeugenol-based materials can be used to produce an eco-friendly vertical LC alignment system.
我们合成了一系列可再生的植物基异丁香酚取代聚苯乙烯（PIEU#，# = 100、80、60、40和20，其中#为异丁香酚部分的摩尔百分比含量），通过聚合物改性反应研究它们的液晶（LC）取向行为。一般来说，使用异丁香酚侧基摩尔含量较高的聚合物薄膜制备的LC盒呈现垂直LC取向行为。这种取向行为与聚合物层的表面能值密切相关。例如，当聚合物的极性表面能值小于约3.59 mJ/m²时观察到垂直取向，这是由具有长而庞大碳基团的非极性异丁香酚部分产生的。使用PIEU100作为LC取向层制备的LC盒在100°C和15 J/cm²的紫外线（UV）照射下观察到良好的取向稳定性。因此，可再生的异丁香酚基材料可用于生产环保型垂直LC取向系统。
