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Study of hybrid materials composed of PMMA and silica prepared via the sol-gel technique

Abstract
This study focused on the structure of the particles developed in the PMMA matrix as a function of (a) coupling agent (£^-MPS) and (b) TEOS content. We investigated the difference of using TEOS monomer directly added to silica particles. The polymer precursors are catalyzed using acidic catalysts and undergo the sol-gel reaction to form a hybrid sol-gel material. This composite shows that highly optical transparency and microphase separation at the molecular level. The characteristics and properties of the polymer precursors and their hybrid materials were characterized by Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and thermogravimogravimetic analysis (TGA). As for the influence of chemistry structure on morphology and thermal properties, experimental evidence form observations by scanning electron microscopy (SEM), mulitpoints analysis, and transmission electron microscopy (TEM). TEM was used to study the phase separation as well as the fractal structure of these particles present in the system. According to some result, it was found the compatibility between PMMA and silica mainly comes form incorporating the polymer with silica chemical bonding. This chemical bonding not only restrains silyl ester groups form hydrolyzing but also reduces silanol aggregation. Moreover, the thermal properties of the organic¡Vinorganic hybrid are improved as silica content increases.

Identiferoai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0730101-151434
Date30 July 2001
CreatorsCheng, Shun-Yu
Contributorsnone, none, none, Hong-Yang Lu
PublisherNSYSU
Source SetsNSYSU Electronic Thesis and Dissertation Archive
LanguageCholon
Detected LanguageEnglish
Typetext
Formatapplication/pdf
Sourcehttp://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0730101-151434
Rightswithheld, Copyright information available at source archive

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