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Highly Unsaturated Microcrystalline Cellulose and Its Cross-Linked Soybean-Oil-Based Thermoset Composites
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-12-10 00:00:00 , DOI: 10.1021/acssuschemeng.8b05968 Tingting Chen 1 , Wendi Liu 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-12-10 00:00:00 , DOI: 10.1021/acssuschemeng.8b05968 Tingting Chen 1 , Wendi Liu 1
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Microcrystalline cellulose (MCC) was highly decorated with unsaturation functionality through esterification with methacrylic anhydride (MAA) with the assistance of ultrasonic treatment. The degree of unsaturation on the MCC surface was tailored by adjusting the mass ratio of MAA to MCC during the modification process. The unsaturated-MCC was characterized by FTIR, XRD, XPS, NMR, and contact angle measurements. The degrees of substitution and unsaturation of the unsaturated-MCC were quantitatively determined by NMR and XPS analyses to reveal the grafting efficiency of MAA on the MCC surface. The unsaturated-MCC was further used as a reactive reinforcing agent for cross-linking with acrylated epoxidized soybean oil (AESO) to manufacture fully biobased MCC/AESO composites. The cross-linking mechanism between the unsaturated-MCC and AESO was discussed through the curing kinetic behavior of the MCC/AESO systems based on Kissinger’s theory. The unsaturation functionalization of MCC resulted in significantly improved flexural strength and modulus, water resistance, storage modulus, glass transition temperature, thermal stability, and interfacial adhesion of the resulting unsaturated-MCC/AESO composites.
中文翻译：
高度不饱和的微晶纤维素及其交联的基于大豆油的热固性复合材料
在超声处理的辅助下，通过与甲基丙烯酸酐（MAA）酯化，微晶纤维素（MCC）具有高度的不饱和功能。通过在改性过程中调节MAA与MCC的质量比来调整MCC表面的不饱和度。通过FTIR，XRD，XPS，NMR和接触角测量来表征不饱和MCC。通过NMR和XPS分析定量确定不饱和MCC的取代度和不饱和度，以揭示MAA在MCC表面上的接枝效率。不饱和MCC进一步用作与丙烯酸酯化的环氧化大豆油（AESO）交联的反应性增强剂，从而生产出完全基于生物的MCC / AESO复合材料。基于基辛格理论，通过MCC / AESO体系的固化动力学行为，探讨了不饱和MCC与AESO之间的交联机理。MCC的不饱和官能化可显着提高所得不饱和MCC / AESO复合材料的弯曲强度和模量，耐水性，储能模量，玻璃化转变温度，热稳定性和界面粘合性。
更新日期：2018-12-10
中文翻译：
高度不饱和的微晶纤维素及其交联的基于大豆油的热固性复合材料
在超声处理的辅助下，通过与甲基丙烯酸酐（MAA）酯化，微晶纤维素（MCC）具有高度的不饱和功能。通过在改性过程中调节MAA与MCC的质量比来调整MCC表面的不饱和度。通过FTIR，XRD，XPS，NMR和接触角测量来表征不饱和MCC。通过NMR和XPS分析定量确定不饱和MCC的取代度和不饱和度，以揭示MAA在MCC表面上的接枝效率。不饱和MCC进一步用作与丙烯酸酯化的环氧化大豆油（AESO）交联的反应性增强剂，从而生产出完全基于生物的MCC / AESO复合材料。基于基辛格理论，通过MCC / AESO体系的固化动力学行为，探讨了不饱和MCC与AESO之间的交联机理。MCC的不饱和官能化可显着提高所得不饱和MCC / AESO复合材料的弯曲强度和模量，耐水性，储能模量，玻璃化转变温度，热稳定性和界面粘合性。
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