Yang DaEun, Jin Chowon, Kang Hyo
BK-21 Four Graduate Program, Department of Chemical Engineering, Dong-A University, 37 Nakdong-Daero 550 Beon-gil, Saha-gu, Busan 49315, Korea.
Polymers (Basel). 2022 Mar 23;14(7):1302. doi: 10.3390/polym14071302.
We synthesized sustainable 2,4-di--butylphenoxymethyl-substituted polystyrenes (PDBP#, # = 88, 68, 35, and 19, where # is molar percent contents of 2,4-di--butylphenoxymethyl moiety), using post-polymerization modification reactions in order to study their liquid crystal (LC) alignment behaviors. In general, LC cells fabricated using polymer film with higher molar content of 2,4-di--butylphenoxymethyl side groups showed vertical LC alignment behavior. LC alignment behavior in LC cell was related to the surface energy of the polymer alignment layer. For example, when the total surface energy value of the polymer layer was smaller than about 29.4 mJ/m, vertical alignment behaviors were observed, generated by the nonpolar 2,4-di--butylphenoxymethyl moiety with long and bulky carbon groups. Orientation stability was observed at 200 °C in the LC cells fabricated using PDBP88 as the LC alignment layer. Therefore, as a natural compound modified polymer, PDBP# can be used as a candidate LC alignment layer for environmentally friendly applications.
我们通过后聚合改性反应合成了可持续的2,4 - 二 - 丁基苯氧基甲基取代的聚苯乙烯（PDBP#，# = 88、68、35和19，其中#是2,4 - 二 - 丁基苯氧基甲基部分的摩尔百分比含量），以研究它们的液晶（LC）取向行为。一般来说，使用具有较高摩尔含量的2,4 - 二 - 丁基苯氧基甲基侧基的聚合物薄膜制造的LC盒表现出垂直LC取向行为。LC盒中的LC取向行为与聚合物取向层的表面能有关。例如，当聚合物层的总表面能值小于约29.4 mJ/m²时，观察到由具有长且庞大碳基团的非极性2,4 - 二 - 丁基苯氧基甲基部分产生的垂直取向行为。在使用PDBP88作为LC取向层制造的LC盒中，在200°C时观察到取向稳定性。因此，作为天然化合物改性聚合物，PDBP#可作为环境友好应用的候选LC取向层。
