Abstract
The effect of pressure on melting, crystal transformation, and glass transition of poly[3,3-bis(chloromethyl)oxacyclobutane], Penton, has been studied up to 7000 kg/cm2 by the DTA and dilatometric method.The melting temperature–pressure curve for the sample crystallized under high pressure indicates a maximum at about 2800 kg/cm2, although that for the sample crystallized at atmospheric pressure shows a steady increase with pressure. The sample crystallized under pressure above the maximum point shows a diffused X-ray pattern, the broad melting peak in DTA scan and the positive volume change upon melting in dilatometric measurement. Under pressure above 1800 kg/cm2, Penton crystallizes in the β-form, not in the α-form. Further it is observed that the β-form transforms to the α-form by means of annealing at the pressure range of 1800–2000 kg/cm2.The pressure dependence of glass transition temperature of Penton is comparatively small, 10–13°C/1000 kg/cm2. After cooling the sample from rubbery state to glassy state under pressure and reducing suddenly the applied pressure, the subsequent volume–temperature curve shows an anomalous increase around the glass transition temperature, which should be measured at the reduced pressure.
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Matsushige, K., Hirakawa, S. & Takemura, T. The Transition and Crystal Transformation of Poly[3,3-bis(chloromethyl)oxacyclobutane] under High Pressure. Polym J 3, 166–175 (1972). https://doi.org/10.1295/polymj.3.166
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DOI: https://doi.org/10.1295/polymj.3.166
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