Remarkable toughness reinforcement of elastomer with cellulose microgel: Employing polymer matrix and cellulose nanofiber network as the continuous phase and energy dissipation agent
Remarkable toughness reinforcement of elastomer with cellulose microgel: Employing polymer matrix and cellulose nanofiber network as the continuous phase and energy dissipation agent
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纤维素微凝胶显着增强弹性体韧性：采用聚合物基体和纤维素纳米纤维网络作为连续相和耗能剂
DOI：
10.1016/j.indcrop.2022.115227
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发表时间：
2022
影响因子：
5.9
通讯作者：
Yuxin Liu
中科院分区：
文献类型：
--
作者：
Bin Sun;Ziting Yuan;Kai Li;Wei Tang;Juan Xu;Han Zheng;Geng Li;Yuxin Liu
双网络增强策略已被广泛应用于水凝胶的增韧改性，但在本体聚合物中的应用却很少。该策略的关键是引入牺牲键来提高强度并在高延伸率下保持聚合物基体的完整性，尽可能多地消散施加的能量。在这项研究中，微米级的微凝胶作为牺牲剂，以增强聚合物基体。介绍了一种简单而通用的制备纤维素微凝胶/聚（丙烯酸丁酯（BA）- co -甲基丙烯酸甲酯（MMA））纳米复合材料的方法，该方法是通过原位自由基聚合含有分散良好的纤维素微凝胶的BA和MMA复合单体溶液。聚合后，发现微凝胶均匀分布在聚合物基质中。有机相细菌纤维素微凝胶（OB-microgel）增强聚合物在拉伸试验中表现出惊人的性能。用1.0wt%OB-微凝胶增强的P（BA-co-MMA）的极限强度、杨氏模量和韧性分别为1.13 MPa、1.09 MPa和1.11 KJ m-3，比纯P（BA-co-MMA）高约2-3倍。此外，保持了类似于纯P（BA-co-MMA）的高失效应变。这种增强作用主要归因于微凝胶的牺牲作用，而不是渗透网络的形成，这也得到了DMA测试的支持。因此，由纤维素微凝胶网络组成的纤维素微凝胶被证明是一种有效的能量耗散剂，用于聚合物基体的连续相，以获得高的断裂应变和高的拉伸强度。·采用微米尺寸的微凝胶作为牺牲剂以增强本体聚合物基质。·微凝胶的增强效果比NFC好得多。·这种增强主要归因于微凝胶的牺牲效应。
Double-network reinforcement strategy has been widely used to improve hydrogels' toughness but is rarely applied in bulk polymer. The key to this strategy is introducing sacrificial bonds to improve strength and maintain the integrity of the polymer matrix at high elongation, dissipating applied energy as much as possible. In this study, a micron-sized microgel was employed as a sacrificial agent to reinforce polymer matrix. A simple and versatile process was introduced for the fabrication of cellulose microgel/ poly(butyl acrylate(BA)- co -methyl methacrylate(MMA)) nanocomposites by in situ free-radical polymerizations of BA and MMA complex monomer solution contained with well-dispersed cellulose microgels. After polymerization, the microgels were found homogeneously distributed within the polymer matrix. The organic-phase bacterial cellulose microgels (OB-microgel) reinforced polymer exhibited marvelous performance in the tensile test. The ultimate strength, Young's modulus, and toughness of P(BA-co-MMA) reinforced with 1.0 wt% OB-microgel were 1.13 MPa, 1.09 MPa, and 1.11 KJ m −3 , about 2–3 times higher than neat P(BA-co-MMA) respectively. Moreover, a high strain to failure similar to the neat P(BA-co-MMA) was maintained. This reinforcement was mainly attributed to the sacrificing effect of microgel, not the formation of a percolation network, which was also supported by DMA test. Hence, cellulose microgel consisting of cellulose nanofiber network was demonstrated to be an efficient energy dissipation agent for the continuous phase of the polymer matrix to acquire high strain to failure and high tensile strength. • A micron-sized microgel was employed as a sacrificial agent to reinforce the bulk polymer matrix. • The reinforcement effect of microgel is much better than NFC. • This reinforcement was mainly attributed to the sacrificing effect of microgel.
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影响因子：
3.7
作者：
Wu Siwu;Qiu Min;Tang Zhenghai;Guo Baochun
通讯作者：
Guo Baochun
影响因子：
9.5
作者：
F. Quero;M. Nogi;H. Yano;K. Abdulsalami;S. Holmes;B. Sakakini;S. Eichhorn
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F. Quero;M. Nogi;H. Yano;K. Abdulsalami;S. Holmes;B. Sakakini;S. Eichhorn
将聚酯接枝到石墨烯上用于导电和导热复合材料
影响因子：
5.5
作者：
Tang, Zhenghai;Kang, Hailan;Jia, Demin
通讯作者：
Jia, Demin
影响因子：
9.5
作者：
Fan, Jinchen;Shi, Zixing;Yin, Jie
通讯作者：
Yin, Jie
影响因子：
5.5
作者：
Pei, Aihua;Malho, Jani-Markus;Berglund, Lars A.
通讯作者：
Berglund, Lars A.