Effect of Acid Hydrolysis Conditions on the Properties of Cellulose Nanoparticle-Reinforced Polymethylmethacrylate Composites.
Effect of Acid Hydrolysis Conditions on the Properties of Cellulose Nanoparticle-Reinforced Polymethylmethacrylate Composites.
复制标题
酸水解条件对纤维素纳米粒子增强聚甲基丙烯酸甲酯复合材料性能的影响
DOI：
10.3390/ma7010016
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发表时间：
2013-12-20
期刊：
影响因子：
--
通讯作者：
Wu Q
中科院分区：
文献类型：
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作者：
Han G;Huan S;Han J;Zhang Z;Wu Q
使用两种浓度水平的硫酸（即 48 wt% 和 64 wt%，生成的 CNP 分别指定为 CNPs-48 和 CNPs-64），然后进行高压均质，由微晶纤维素制备纤维素纳米颗粒 (CNP)。采用溶剂交换和溶液流延方法制备了不同 CNP 负载量的 CNP 增强聚甲基丙烯酸甲酯 (PMMA) 复合薄膜。 400~800 nm之间的紫外-可见光（UV-vis）透射率光谱表明，CNPs-64/PMMA复合材料的光学透射率明显高于CNPs-48/PMMA。它们的透射率随着 CNP 负载量的增加而降低。在 PMMA 基体中添加 CNP 降低了复合材料的热膨胀系数 (CTE)，并且在相同 CNP 水平下，CNPs-64/PMMA 的 CTE 低于 CNPs-48/PMMA。通过将 CNP 添加到 PMMA 基体中，实现了增强效果，尤其是在较高温度水平下。与CNPs-48/PMMA材料相比，CNPs-64/PMMA表现出更高的储能模量。所有 CNP 增强复合材料均表现出比纯 PMMA 更高的杨氏模量和拉伸强度。对于 CNPs-64/PMMA 和 CNPs-48/PMMA 复合材料，随着 PMMA 基体中 CNP 负载量的增加，效果也会增强。 CNP 对杨氏模量的影响大于对拉伸强度的影响。
Cellulose nanoparticles (CNPs) were prepared from microcrystalline cellulose using two concentration levels of sulfuric acid (i.e., 48 wt% and 64 wt% with produced CNPs designated as CNPs-48 and CNPs-64, respectively) followed by high-pressure homogenization. CNP-reinforced polymethylmethacrylate (PMMA) composite films at various CNP loadings were made using solvent exchange and solution casting methods. The ultraviolet-visible (UV-vis) transmittance spectra between 400 and 800 nm showed that CNPs-64/PMMA composites had a significantly higher optical transmittance than that of CNPs-48/PMMA. Their transmittance decreased with increased CNP loadings. The addition of CNPs to the PMMA matrix reduced composite’s coefficient of thermal expansion (CTE), and CNPs-64/PMMA had a lower CTE than CNPs-48/PMMA at the same CNP level. Reinforcement effect was achieved with the addition of CNPs to the PMMA matrix, especially at higher temperature levels. CNPs-64/PMMA exhibited a higher storage modulus compared with CNPs-48/PMMA material. All CNP-reinforced composites showed higher Young’s modulus and tensile strengths than pure PMMA. The effect increased with increased CNP loadings in the PMMA matrix for both CNPs-64/PMMA and CNPs-48/PMMA composites. CNPs affected the Young’s modulus more than they affected the tensile strength.