NDLI: In situ atom transfer radical polymerization of styrene in the presence of nanoporous silica aerogel: Kinetic study and investigation of thermal properties

Content Provider	Springer Nature Link
Author	Mirshafiei Langari, Seyed Ataollah haddadi Asl, Vahid Roghani Mamaqani, Hossein Sobani, Masoud Khezri, Khezrollah
Copyright Year	2013
Abstract	Atom transfer radical polymerization (ATRP) of styrene was performed at 110 °C in the presence of organically modified silica aerogel. A hydrophobic silica aerogel was prepared by a two-step, acid–base catalyzed sol–gel polymerization of tetraethoxysilane (TEOS) and surface modification by hexamethyldisilazane (HMDS) at the ambient pressure drying (APD) condition. Fourier transform infrared spectroscopy (FTIR), nitrogen adsorption/desorption, thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were employed to characterize the silica aerogel. Kinetics of styrene ATRP was evaluated in the presence of silica aerogel. Molecular weight and molecular weight distribution were determined by gel permeation chromatography (GPC). There is a critical silica aerogel content that polymerization rate reaches to its lowest level. Thus, the sample with 1 wt% of silica aerogel shows minimum k$_{app}$ with respect to the neat polystyrene. Differential scanning calorimetry (DSC) results reveals that competition between chains mobility and increase of molecular weight by addition of silica aerogel content results in an inconsiderable variation of the T$_{g}$ value. The nanocomposite with 1 wt% of silica aerogel shows minimum T$_{g}$ value (81.4 °C) respect to near polystyrene (94 °C). Transmission electron microscopy (TEM) was used to exhibit the pore size distribution of silica aerogel and either the disappearing of pores by a layer of polystyrene after polymerization.
Starting Page	1
Ending Page	11
Page Count	11
File Format	PDF
ISSN	10229760
Journal	Journal of Polymer Research
Volume Number	20
Issue Number	6
e-ISSN	15728935
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-05-22
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Atom transfer radical polymerization Styrene Silica Aerogel Kinetic study Thermal properties Polymer Sciences Industrial Chemistry/Chemical Engineering Characterization and Evaluation of Materials
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Materials Chemistry Polymers and Plastics

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