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INCREASE IN THE MELTING POINT AND THE ENTHALPY OF MELTING OF POLYAMIDES BY A WATER TREATMENT
INCREASE IN THE MELTING POINT AND THE ENTHALPY OF MELTING OF POLYAMIDES BY A WATER TREATMENT
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机译：水处理提高聚酰胺的熔点和熔解焓
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摘要
The procedure for raising the melting point or fusion enthalpy of a polyamide consists of placing the polyamide in a solid state in contact with water is steam at a temperature close to its crystallisation point for a period sufficient to achieve the required raise in temperature, and then separating the water or steam and drying the polyamide. The procedure for raising the melting point or fusion enthalpy of a polyamide consists of placing the polyamide in a solid state in contact with water is steam at a temperature close to its crystallisation point for a period sufficient to achieve the required raise in temperature, and then separating the water or steam and drying the polyamide. The temperature of the water or steam is between 10 deg C, and preferably 5 deg C, below and above the crystallisation point and the duration of the treatment is between 5 and 100 hours. The polyamide is in powder or granule form and selected from PA 11, PA 12, aliphatic polyamides resulting from the condensation of an aliphatic diamine having 6 - 12 carbon atoms and an aliphatic diacid having 9 - 12 carbon atoms.
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