134. Synthesis and characterization of designed cellulose-graft-polyisoprene copolymers
writer：Zhongkai Wang, Yaqiong Zhang, Feng Jiang, Huagao Fang and Zhigang Wang*
keywords：纖維素接枝聚異戊二烯，合成，表征
source：期刊
specific source：Polym. Chem., 2014, 5(10), 3379-3388
Issue time：2014年
在本文中我們報(bào)道了一種精心設(shè)計(jì)的新型接枝共聚物，該共聚物源自具備相反物理性質(zhì)的兩種豐富的天然高分子：剛性且親水的纖維素和柔性且疏水的合成聚異戊二烯（天然橡膠的類似物），該接枝共聚物將剛性和柔性，疏水性和親水性有機(jī)結(jié)合在一個(gè)大分子中。所設(shè)計(jì)的纖維素-接枝-聚異戊二烯共聚物（Cell-g-PI）是通過均相補(bǔ)充催化劑和還原劑原子轉(zhuǎn)移自由基聚合（SARA ATRP）合成的。FT-IR, 1H NMR,13C NMR和TGA測試表明Cell-g-PI共聚物被成功制備。TEM和DMA實(shí)驗(yàn)結(jié)果說明在Cell-g-PI共聚物中發(fā)生微相分離。水接觸角測試證明Cell-g-PI的疏水性隨著聚異戊二烯側(cè)鏈長度增加而增大。此外，通過自組織沉淀法可以制備水相中的核-殼結(jié)構(gòu)的Cell-g-PI納米粒子。
In this work, we report an elegant design of novel graft
copolymers based on two natural abundant biopolymers with opposite
physical properties: rigid and hydrophilic cellulose, and flexible and
hydrophobic synthesized polyisoprene (analogue of natural rubber), which
combines rigidity and flexibility, hydrophobicity and hydrophilicity
all in one macromolecule. These cellulose-graft-polyisoprene (Cell-g-PI)
copolymers were synthesized via homogenous supplemental activator and
reducing agent atom transfer radical polymerization (SARA ATRP). FT-IR,
1H NMR, 13C NMR and TGA measurements demonstrate that Cell-g-PI
copolymers are successfully prepared. TEM and DMA results illustrate
that phase separation occurs in Cell-g-PI copolymers. Water contact
angle measurements verify that their hydrophobicity increases with
increasing polyisoprene side chain length. In addition, the core–shell
Cell-g-PI nanoparticles in water can be prepared via a self-organized
precipitation (SORP) method.