Efficient and Controllable Synthesis of Grafting Bimodal Polymer Brushes on Nanoparticles

doi:10.11777/j.issn1000-3304.2017.17046

CORC > 化学研究所 > 中国科学院化学研究所

	Efficient and Controllable Synthesis of Grafting Bimodal Polymer Brushes on Nanoparticles
	Shui, Yu-dan 1,2; Su, Yun-lan 2; Zhao, Wei-wei 2; Cai, Yuan-li 1; Wang, Du-jin 2
刊名	ACTA POLYMERICA SINICA
	2017-11-20
期号	11 页码:1773-1780
关键词	Stober Silica Particles Poly(Ethylene Glycol) Mixed Solvent Bimodal Brush
ISSN号	1000-3304
DOI	10.11777/j.issn1000-3304.2017.17046
英文摘要	We report here a facile and controllable synthesis of bimodal poly(ethylene glycol) (PEG) brushes grafted on silica nanoparticles (NPs) through mixture of good and poor solvents. Methoxypolyethylene glycol (MPEG) (M-w = 750 and 4000) was modified in a control manner to prepare epoxide terminated PEG (MPEG-EO). The silica, with well-defined siloxane structure and modified by amino groups, was prepared through silanization coupling reaction with, N-(2-aminoethy)-3-aminopropylmethyldimethoxysilane (AMDS). A two step method was used to get the bimodal polymer brushes grafted onto the nanoparticles (NPs). MPEG-EO with low molecular weights (M-w = 750) was first coupled to modified silica in toluene at 110 degrees C, the obtained sample was again reacted with MPEG-EO with high molecular weight (M-w = 4000) in a mixed solvent of n-decane/toluene. Based on the thermogravimetric (TGA) results, more poor solvent (n-decane) in the solvent mixture resulted in a higher grafting density for MPEG-EO. The grafting density could be controlled easily by changing the composition of the mixed solvent, which was different from the traditional ways to control the grafting density through changing temperature, time and concentration of the coupling agent. The grafting density was found to be about 0.85 and 0.4 chains/nm(2) for MPEG-EO with molecular weight of 750 and 4000, respectively. These values are extremely high compared to those previously reported. This high grafting density is explained by the decreased chain dimension of PEG in the presence of poor solvent, which lowers the excluded volume interaction and subsequent inter-chain repulsion, allowing a better packing at the silica surface, and the energy barrier of the surface coupling chemistry is effectively overcomed. This technique, efficiently controllable and facile, provides theoretical guidance for the development of silica NPs and may promote tethering polymer to silica NPs based on the connection between the chain dimension and the grafting density.
语种	英语
出版者	SCIENCE PRESS
WOS记录号	WOS:000417897400008
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/45247]
专题	中国科学院化学研究所
通讯作者	Su, Yun-lan; Cai, Yuan-li
作者单位	1.Soochow Univ, Coll Chem Chem Engn & Mat Sci, Jiangsu Key Lab Adv Funct Polymer Design & Applic, Suzhou 215123, Peoples R China 2.Chinese Acad Sci, Beijing Natl Lab Mol Sci, Inst Chem, Key Lab Engn Plast, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Shui, Yu-dan,Su, Yun-lan,Zhao, Wei-wei,et al. Efficient and Controllable Synthesis of Grafting Bimodal Polymer Brushes on Nanoparticles[J]. ACTA POLYMERICA SINICA,2017(11):1773-1780.
APA	Shui, Yu-dan,Su, Yun-lan,Zhao, Wei-wei,Cai, Yuan-li,&Wang, Du-jin.(2017).Efficient and Controllable Synthesis of Grafting Bimodal Polymer Brushes on Nanoparticles.ACTA POLYMERICA SINICA(11),1773-1780.
MLA	Shui, Yu-dan,et al."Efficient and Controllable Synthesis of Grafting Bimodal Polymer Brushes on Nanoparticles".ACTA POLYMERICA SINICA .11(2017):1773-1780.