Diacetylene-Containing Dual-Functional Liquid Crystal Epoxy Resin: Strategic Phase Control for Topochemical Polymerization of Diacetylenes and Thermal Conductivity Enhancement

• DOI: 10.1021/acs.macromol.2c00436
• Publication Date: 2022-05-04T13:07:10Z
• Authors: Md. Monir Hossain; Arinola Isa Olami...; Hyun-Oh Jeong; Hongjin Lim; Young-Kyeong Kim; Hyunjin Cho; Hyeon Dam Jeong; Md. Akherul Islam; Munju Goh; Nam-Ho You; Myung Jong Kim; Siyoung Q. Choi; Jae Ryang Hahn; Hyeonuk Yeo; Se Gyu Jang
• Keywords: Diacetylene; Mesogen

Liquid crystal epoxy resins (LCERs) with high thermal conductivity have been drawing significant attention to overcome the limitation of polymeric composites. Nonetheless, strategy enhance LCERs has primarily focused on improving well-ordered molecular structure originated from LC phases reduce phonon scattering. Furthermore, other important factors for enhancement such as intermolecular interaction, fine-tuning polymer chain structure, and interchain conjugation rarely investigated LCERs. Here, we introduce a dual-functional LCER enabling creation microstructures well π-conjugation networks synergistically suppressing As key design functional group, diphenyl-diacetylene (DPDA) mesogen was employed assemble highly ordered lamellar microstructure create via topochemical polymerization well-organized diacetylenes. The cured DPDA resin (∼0.43 W m–1 K–1) 194% compared commercial (∼0.22 K–1). Thermal further increased up 227% (∼0.50 post-topochemical diacetylenes, leading π–π stacking. composites prepared hexagonal boron nitride fillers also by 19% after simple heat treatment composites, inducing Finally, striking increase 10.3 K–1 18.3 observed simply replacing matrix one (DPDAER), clearly revealing superiority our DPDAER in development high-thermal-conductivity