Abstract
The thermal stability of blends of low density polyethylene (LDPE) and poly(ethyl acrylate) (PEA) with whiting type coated calcium carbonate of mean particle size 1·5 μ has been investigated in inert atmosphere using TG-DTG and TVA. Ethylene ethyl acrylate (EEA) copolymer has been investigated with different types of calcium carbonate by the same techniques and also by DSC. The condensable volatile degradation products from TVA experiments were separated by subambient TVA (SATVA) and investigated by FT-IR spectroscopy, MS and GC-MS techniques. The cold ring (tar/wax) fraction was investigated by FT-IR spectroscopy and GC. Degradation products from blends of these materials with calcium carbonate were mainly similar to those when the filler was absent but the proportion of cold ring fraction was increased. In the case of EEA copolymer, minor volatile products such as acetic and propanoic acid normally present were either formed in trace amounts or absent when the copolymer was blended with calcium carbonate. Mechanisms of formation of degradation products from the blends are discussed.
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