Abstract
Temperature-programmed desorption mass spectrometry has been used to study vacuum thermolysis of high-density polyethylene (HDPE) and its composites with hydrophilic or hydrophobic nanosilica in the presence or absence of butylated hydroxytoluene (BHT). It has been found that both surface chemistry of silica filler and the presence of immobilized BHT affect the pathway of HDPE thermal decomposition. Volatility of BHT antioxidant was shown to decrease in the following sequence: free BHT > HDPE–BHT > HDPE–hydrophobic silica/BHT > HDPE–hydrophilic silica/BHT, and the capability of the additives to inhibit chain scission reaction during thermal decomposition of HDPE in vacuum was as follows: hydrophobic silica/BHT > BHT > hydrophobic silica > hydrophilic silica/BHT > hydrophilic silica ≈ no additives.
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