Effects of SBA-15 contents on the MMA solution polymerization and PMMA composites
作者：Zhi-Bo Wei, Rui Bai, Fa-Ai Zhang
關鍵字：Mesoporous silica SBA-15, PMMA, composites, solution polymerization
論文來源：期刊
具體來源：Iranian Polymer Journal
發表時間：2013年
Ordered
mesoporous material SBA-15 was considered as a promising reinforcement agent for polymeric
materials due to its large surface area and uniform pore
structure. In this
paper, poly(methyl methacrylate) (PMMA)/SBA-15 composites were prepared by in-situ
free-radical solution polymerization of MMA in the presence of SBA-15. The
effects of SBA-15 amounts on the solution polymerization and the properties of
the resulted polymer composite were investigated. The molecular weight and its
distribution of the PMMA/SBA-15 composites were determined by gel permeation
chromatography. Fourier transform infrared spectra, X-Ray diffraction, thermal
gravimetric analysis (TGA), differential scanning calorimeter and dynamic
mechanical analysis were used to characterize the structure and properties of the
composites. The morphology of the composites was observed with scanning electric microscopy (SEM) and transmission electron
microscope (TEM). The
results demonstrated that the monomer conversion dropped off but average
molecular weight increased upon the introduction of the SBA-15 to the solution
polymerization system. Compared with pure PMMA, the storage modulus of the
composites was improved and the highest improvement was found at 1 wt.% of
SBA-15, based on the monomer. The glass transition temperatures of the
composites were increased a little. TGA results confirmed that the thermal
stability of the composite was not influenced much and the higher amount of
terminal vinyl groups was formed in the polymerization. SEM and TEM images
indicated that SBA-15 particles were incorporated into the polymer matrix.