Journal
JOURNAL OF MACROMOLECULAR SCIENCE-PURE AND APPLIED CHEMISTRY
Volume A41, Issue 11, Pages 1221-1232Publisher
TAYLOR & FRANCIS INC
DOI: 10.1081/MA-200029832
Keywords
trans; 1,4-polybutadiene; silica; sol-gel technology; nanocomposites; mechanical properties; reinforcement
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trans-1,4-Polybutadiene (tPBD) networks crosslinked free radically with dicumyl peroxide (DCP) were reinforced by in situ silica formed in a two-step sol-gel technique. Changing the degree of crosslinking by changing the amount of DCP, or changing the amounts of the sol-gel components [tetraethoxysilane (TEOS) and dibutyltin diacetate (DBTDA)], changed the silica generated with regard to the amount precipitated, particle size, and degree of dispersion. Stress-strain measurements in continuous extension indicated good reinforcement, even at relatively low amounts of silica. Differential scanning calorimetry (DSC) indicated decreases in heat of crystallization with increases in the amounts of silica, but thermogravimetric analysis showed initial decomposition temperatures (IDT) remained relatively constant. Suggestions are made regarding interpretation of these properties in terms of the composite morphologies.
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