通过原子转移自由基聚合原位制备基于自增强纤维素纳米晶体的热塑性弹性体。
In situ development of self-reinforced cellulose nanocrystals based thermoplastic elastomers by atom transfer radical polymerization.
作者信息
Yu Juan, Wang Chunpeng, Wang Jifu, Chu Fuxiang
机构信息
Institute of Chemical Industry of Forestry Products, CAF; National Engineering Laboratory of Biomass Chemical Utilization; Key and Laboratory of Forest Chemical Engineering, SFA; Key Laboratory of Biomass Energy and Material, Nanjing, Jiangsu Province 210042, China.
Institute of Chemical Industry of Forestry Products, CAF; National Engineering Laboratory of Biomass Chemical Utilization; Key and Laboratory of Forest Chemical Engineering, SFA; Key Laboratory of Biomass Energy and Material, Nanjing, Jiangsu Province 210042, China; Institute of Forest New Technology, CAF, Beijing 100091, China.
出版信息
Carbohydr Polym. 2016 May 5;141:143-50. doi: 10.1016/j.carbpol.2016.01.006. Epub 2016 Jan 6.
Recently, the utilization of cellulose nanocrystals (CNCs) as a reinforcing material has received a great attention due to its high elastic modulus. In this article, a novel strategy for the synthesis of self-reinforced CNCs based thermoplastic elastomers (CTPEs) is presented. CNCs were first surface functionalized with an initiator for surface-initiated atom transfer radical polymerization (SI-ATRP). Subsequently, SI-ATRP of methyl methacrylate (MMA) and butyl acrylate (BA) was carried out in the presence of sacrificial initiator to form CTPEs in situ. The CTPEs together with the simple blends of CNCs and linear poly(MMA-co-BA) copolymer (P(MMA-co-BA)) were characterized for comparative study. The results indicated that P(MMA-co-BA) was successfully grafted onto the surface of CNCs and the compatibility between CNCs and the polymer matrix in CTPEs was greatly enhanced. Specially, the CTPEs containing 2.15wt% CNCs increased Tg by 19.2°C and tensile strength by 100% as compared to the linear P(MMA-co-BA).
近年来，由于纤维素纳米晶体（CNCs）具有高弹性模量，其作为增强材料的应用受到了广泛关注。本文提出了一种合成基于CNCs的自增强热塑性弹性体（CTPEs）的新策略。首先用引发剂对CNCs进行表面功能化，以实现表面引发的原子转移自由基聚合（SI-ATRP）。随后，在牺牲引发剂存在的情况下进行甲基丙烯酸甲酯（MMA）和丙烯酸丁酯（BA）的SI-ATRP，原位形成CTPEs。对CTPEs以及CNCs与线性聚（MMA-co-BA）共聚物（P（MMA-co-BA））的简单共混物进行了表征，以进行对比研究。结果表明，P（MMA-co-BA）成功接枝到CNCs表面，CTPEs中CNCs与聚合物基体之间的相容性大大提高。特别是，与线性P（MMA-co-BA）相比，含有2.15wt%CNCs的CTPEs的玻璃化转变温度提高了19.2°C，拉伸强度提高了100%。
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