Use of thermal analysis techniques for examining blow-molded pet bottle specimens
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Eight samples from different areas of stretch-blow-molded poly(ethylene terephthalate) [PET] bottles, including a PET resin control, were tested by differential scanning calorimetry (DSC) and thermomechanical analysis (TMA). The glass transition temperature (T g) was found to linearly decrease about 6‡C from zero to 45 percent initial crystallinity. Measurements ofT c (crystallization temperature, DSC) and film tension modulus (TMA) were related to crystallization rate during stretch-blow-molding. The TMA linear coefficients of thermal expansion and shrinkage were shown to be important for blow-molding temperature control.
Keywordsglass transition hot-fill initial crystallinity shrinkage stretch-blow-molding
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