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Low temperature melting behavior of CO 2 crystallized modified PETs
Author(s) -
Mensitieri G.,
Del Nobile M. A.,
Apicella A.,
Guerra G.,
Al Ghatta H.
Publication year - 1995
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760350608
Subject(s) - differential scanning calorimetry , materials science , crystallization , endothermic process , amorphous solid , glass transition , analytical chemistry (journal) , carbon dioxide , atmospheric temperature range , calorimeter (particle physics) , chemical engineering , thermodynamics , composite material , crystallography , polymer , chemistry , organic chemistry , optics , adsorption , physics , engineering , detector
Differential scanning calorimetry (DSC) analysis has been performed on modified and commericial amorphous samples of poly(ethylene terephthalate) (PET) crystallized by high pressure carbon dioxide (CO 2 ). Two endothermic peaks are present in the DSC scans of all the carbon dioxide‐treated samples. A qualitatively analogous behavior has been detected in the case of amorphous samples heat treated at temperatures slightly exceeding the glass transition temperature of virgin material. Wide angle X‐ray scattering analysis has confirmed the structural analogies between samples CO 2 crystallized at 50°C and thermally crystallized slightly above T g . A differential scanning calorimeter capable of working at high pressure of CO 2 has been adopted in order to examine the effect of carbon dioxide on the crystallization temperature range.