Abstract

A series of ethyl cellulose (EC) grafted copolymers were fabricated with methyl methacrylate (MMA), stearyl methacrylate (SMA) and EC grafted 2-bromoisobutyryl bromide(EC-Br) as macroinitiator via atom transfer radical polymerization (ATRP). The chemical structures of EC-Br and EC graft copolymers were identified by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (¹H NMR) spectroscopy. The EC graft copolymers exhibited higher molecular weight and polydispersity index value. With the dosage of SMA increased, EC grafted copolymers exhibited glass transition temperatures in a broad temperature range from 119.1 to 42.3 ℃. And the initial decomposition temperature (T_i) of EC grafted copolymers were increased (148.2 ℃ to 199.4 ℃). The stresses at break of EC grafted copolymers were decreased with the increase of SMA content. However, the elongation at break of all EC grafted copolymers were increased with the dosage of MMA decreased. These results suggested that the sustainable copolymers with cellulose backbone, acrylate side-chain were potential candidates for service as TPEs in some applications.

Graphic Abstract

中文翻译：

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结合可再生的乙基纤维素和丙烯酸酯，通过可控聚合制备可持续的TPE

摘要

以甲基丙烯酸甲酯（MMA），甲基丙烯酸十八烷基酯（SMA）和EC接枝的2-溴异丁酰溴（EC-Br）为大分子引发剂，通过原子转移自由基聚合（ATRP）制备了一系列乙基纤维素（EC）接枝共聚物。EC-Br和EC接枝共聚物的化学结构通过傅立叶变换红外光谱（FT-IR）和核磁共振（¹ H NMR）光谱进行了鉴定。EC接枝共聚物表现出较高的分子量和多分散指数值。随着SMA用量的增加，EC接枝共聚物在119.1至42.3℃的较宽温度范围内表现出玻璃化转变温度。初始分解温度（T _iEC接枝的共聚物的）增加（148.2℃至199.4℃）。EC接枝共聚物的断裂应力随SMA含量的增加而降低。然而，所有的EC接枝共聚物的断裂伸长率都随着MMA用量的减少而增加。这些结果表明，具有纤维素骨架，丙烯酸酯侧链的可持续共聚物在某些应用中可能用作TPE。

图形摘要