Synthesis of fully divanillic acid-based aromatic polyamides and their thermal and mechanical properties
Synthesis of fully divanillic acid-based aromatic polyamides and their thermal and mechanical properties
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DOI：
10.1016/j.polymer.2022.125222
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发表时间：
2022-08
期刊：
影响因子：
4.6
通讯作者：
Kazuma Yagura;Yukiko Enomoto;T. Iwata
中科院分区：
文献类型：
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作者：
Kazuma Yagura;Yukiko Enomoto;T. Iwata
通过烷基化二香草酸（DVA）基二羧酸单体和二胺单体的缩聚合成了具有甲基或丁基侧链（R = -（CH 2）n-1-CH 3; n = 1或4）的重均分子量为49，000至60，000 g mol-1的完全二香草酸（DVA）基芳族聚酰胺（R-R′-DVAPA）。聚酰胺的热重分析发现分解温度约为380 °C，玻璃化转变温度为207 °C-262 °C，这取决于侧链长度，表明具有高耐热性和热稳定性。差示扫描量热法和动态力学分析表明，DVAPA的无定形结构。DVAPAs在常见极性有机溶剂中具有良好的溶解性，但由二甲基甲酰胺溶液制备的流延膜较脆。在高于玻璃化转变温度的温度下制备热压膜。沿全芳族主链沿着具有丁基侧链的Bu-Bu′-DVAPA的膜表现出约40 MPa的最大拉伸强度。这些聚酰胺作为完全生物基芳香族高性能塑料是有前途的。
Fully divanillic acid (DVA)-based aromatic polyamides (R-R′-DVAPAs) having methyl or butyl side chains (R = -(CH2)n-1-CH3; n = 1 or 4) with weight-average molecular weights ranging from 49,000 to 60,000 g mol−1were synthesized by polycondensation of alkylated DVA-based dicarboxylic acid monomers and diamine monomers. Thermogravimetric analysis of the polyamides found decomposition temperatures at approximately 380 °C and glass transition temperatures of 207 °C–262 °C, depending on the side-chain length, indicating high heat resistance and thermal stability. Differential scanning calorimetry and dynamic mechanical analysis revealed an amorphous structure for the DVAPAs. The DVAPAs showed good solubility in common polar organic solvents, although cast films prepared from dimethylformamide solution were brittle. Thermo-pressed films were prepared at temperatures higher than the glass transition temperature. The film of Bu-Bu′-DVAPA, which has butyl side chains along the fully aromatic main chain, exhibited a maximum tensile strength of approximately 40 MPa. These polyamides are promising as fully bio-based aromatic high-performance plastics.