Bio-based self-healing coating material derived from renewable castor oil and multifunctional alamine
Bio-based self-healing coating material derived from renewable castor oil and multifunctional alamine
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DOI：
10.1016/j.eurpolymj.2021.110804
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发表时间：
2021-11
影响因子：
6
通讯作者：
Xiao Wei;Junqi Ge;Fei Gao;Fengbiao Chen;Wenxiong Zhang;Jiang Zhong;Cong Lin;Liang Shen
中科院分区：
文献类型：
--
作者：
Xiao Wei;Junqi Ge;Fei Gao;Fengbiao Chen;Wenxiong Zhang;Jiang Zhong;Cong Lin;Liang Shen
生物基自修复涂层材料由于具有延长的生命周期、可再生的原材料以及与石油基涂层相当的性能等优点而引起了人们的极大兴趣。以多功能氨基丙氨酸和含有乙酰乙酸酯和酸基的生物基改性乙酰乙酰化蓖麻油（MACO）为原料，制备了一种生物基自修复涂层材料。使用酯交换反应和硫醇-烯点击反应（允许控制酸基团的比率）合成MACO。根据MACO中酸基比例的不同，采用多官能度的氨基铝胺，通过胺-乙酰乙酸酯反应（或胺-羧酸缩合反应）制备了3种涂层材料。随着MACO中酸性基团比例的增加，我们制备的涂层材料的杨氏模量、交联密度（ve）和玻璃化转变温度（Tg）得到改善。因此，生物基涂层中的酸基团的比率可用于容易地调节机械性能。对于在蓖麻油中含有50%-C = C酸基团的代表性膜的生物基涂层，伸长率强度和拉伸强度分别高达52%和5.53MPa。应力松弛和力学性能恢复实验表明，该膜具有69 kJ/mol的低活化能（Ea），120 °C下6 h的自修复效率为80%。这些结果表明，生物基自修复涂层材料具有良好的自修复性能。
Bio-based self-healing coating materials have attracted considerable interest owing to the advantages of extended life cycle, renewable raw materials, and performance comparable to petroleum-based coatings. A bio-based self-healing coating material was prepared using multifunctional alamine and bio-based modified acetoacetylated castor oil (MACO) containing acetoacetate moieties as well as acid groups. The MACO was synthesized using a transesterification reaction and thiol-ene click reaction (allowing control of the ratio of acid groups). Based on the different ratios of acid groups of MACO, three coating materials were prepared from an amine-acetoacetate reaction (or amine-carboxylic acid condensation reaction) using multifunctional alamine. The Young’s modulus, crosslinking density (ve), and glass transition temperature (Tg) of our prepared coating materials were improved with higher ratio of acid groups from the MACO. Hence, the ratio of acid groups in the bio-based coating can be employed to readily adjust the mechanical properties. For the bio-based coating of a representative film containing 50 % acid groups of -C = C in castor oil, the elongation strength and tensile strength were as high as 52 % and 5.53 MPa, respectively. The stress-relaxation and mechanical performance recovery experiments revealed that the film had a low activation energy (Ea) of 69 kJ/mol, and a self-healing efficiency of 80 % at 120 °C for 6 h. These results showed that the bio-based self-healing coating material exhibits good self-healing performance.