Synthesis and characterization of gibbsite nanoplatelet brushes by surface-initiated atom transfer radical polymerization

Synthesis and characterization of gibbsite nanoplatelet brushes by surface-initiated atom transfer radical polymerization
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表面引发原子转移自由基聚合三水铝石纳米片刷的合成与表征

DOI:
10.1016/j.polymer.2017.08.028
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发表时间:
2017
期刊:
影响因子:
4.6
通讯作者:
Bockstaller, Michael R.
Bockstaller, Michael R.
中科院分区:
化学2区
文献类型:
--
作者:
Zhang, Jianan;Lee, Jaejun;Wang, Zongyu;Yan, Jiajun;Lu, Zhao;Liu, Siyuan;Luo, Danli;Matyjaszewski, Krzysztof;Bockstaller, Michael R.

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采用表面引发原子转移自由基聚合(SI-ATRP)技术,对三水铝石(γ-Al(OH)3)纳米片晶粒子进行了表面改性。新开发的基于12-(2-溴异丁酰胺基)十二烷酸(BiBADA)的引发剂体系能够使接枝密度超过0.4 nm− 2,同时具有最少量的游离均聚物杂质和窄的分子量分布。三水铝石刷纳米片被证明组织成透明的薄膜与珍珠般的层状形态。观察到玻璃化转变温度的显著增加(与原始PMMA相比),这归因于平面刷结构中空间限制的增加。所提出的方法的广泛的ATRP兼容的化学品的适用性可能是一个基础,用于开发新的功能材料,其中的属性取决于刷纳米片取向和相互作用的方向性。
An efficient method for the polymer modification of gibbsite (γ-Al(OH)3) nanoplatelet particles with poly(methyl methacrylate) (PMMA) by surface-initiated atom transfer radical polymerization (SI-ATRP) was developed. A newly developed initiator system based on 12-(2-bromoisobutyramido) dodecanoic acid (BiBADA) enable grafting densities in excess of 0.4 nm−2with minimal amount of free homopolymer impurities and narrow molecular weight distribution. The gibbsite brush nanoplatelets were shown to organize into transparent films with nacre-like lamellae morphology. A significant increase of the glass transition temperature (as compared to pristine PMMA) was observed and attributed to the increase of steric confinement in planar brush architectures. The applicability of the presented methodology to a wide range of ATRP-compatible chemistries could be a basis for the development of novel functional materials in which properties depend on the directionality of brush nanoplatelet orientation and interaction.
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