Kamo Yoshiyuki, Matsumoto Akikazu
Advanced Technology R&D Center, Mitsubishi Electric Corporation, 8-1-1, Tsukaguchi-Honmachi, Amagasaki, Hyogo 661-8661, Japan.
Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai 599-8531, Osaka, Japan.
Molecules. 2024 Apr 29;29(9):2059. doi: 10.3390/molecules29092059.
Materials with monolithic structures, such as epoxy monoliths, are used for a variety of applications, such as for column fillers in gas chromatography and HPLC, for separators in lithium-ion batteries, and for precursor polymers for monolith adhesion. In this study, we investigated the fabrication of epoxy monoliths using 1,3-bis(-diglycidylaminomethyl)cyclohexane (TETRAD-C) as the tetrafunctional epoxy and 4,4'-methylenebis(cyclohexylamine) (BACM) as the amine curing agent to control pore diameters using polyethylene glycols (PEGs) of differing molecular weights as the porogenic agents. We fabricated an epoxy monolith with micron-order pores and high strength levels, and which is suitable for the precursors of composite materials in cases where smaller PEGs are used. We discussed the effects of the porous structures of monoliths on their physical properties, such as tensile strength, elongation, elastic modulus, and glass transition temperatures. For example, epoxy monoliths prepared in the presence of PEGs exhibited an elastic modulus less than 1 GPa at room temperature and Tg values of 175-187 °C, while the epoxy bulk thermoset produced without any porogenic solvent showed a high elastic modulus as 1.8 GPa, which was maintained at high temperatures, and a high Tg of 223 °C. In addition, the unique adhesion characteristics of epoxy monolith sheets are revealed as a result of the combinations made with commercial epoxy and acrylic adhesives. Epoxy monoliths that are combined with conventional adhesives can function as sheet-type adhesives purposed with avoiding problems when only liquid-type adhesives are used.
具有整体结构的材料，如环氧整体材料，被用于各种应用，例如作为气相色谱和高效液相色谱中的柱填料、锂离子电池中的隔膜以及整体黏附的前体聚合物。在本研究中，我们研究了使用1,3-双（-二缩水甘油氨基甲基）环己烷（TETRAD-C）作为四官能环氧树脂，4,4'-亚甲基双（环己胺）（BACM）作为胺固化剂，以不同分子量的聚乙二醇（PEG）作为致孔剂来制备环氧整体材料，从而控制孔径。我们制备了具有微米级孔隙和高强度水平的环氧整体材料，在使用较小PEG的情况下，该材料适用于复合材料的前体。我们讨论了整体材料的多孔结构对其物理性能的影响，如拉伸强度、伸长率、弹性模量和玻璃化转变温度。例如，在PEG存在下制备的环氧整体材料在室温下的弹性模量小于1 GPa，玻璃化转变温度为175 - 187 °C，而在没有任何致孔溶剂的情况下制备的环氧本体热固性材料具有高达1.8 GPa的高弹性模量，且在高温下保持不变，玻璃化转变温度为223 °C。此外，环氧整体材料片材与商业环氧和丙烯酸粘合剂组合后展现出独特的粘附特性。与传统粘合剂组合的环氧整体材料可作为片状粘合剂使用，旨在避免仅使用液体型粘合剂时出现的问题。
