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J. Koszkul

The effect of temperature on the phase composition of polyamide 6 and polytrioxane

Polimery 1988, No 7-8, 264

DOI: dx.doi.org/10.14314/polimery.1988.264


The method of high-temperature X -ray analysis has been applied to the studies in the temperature range of 20—250°C of the phase system of injection moulded specimens of Polish-made polyamide 6 (Tarnamid T-27) and polytrioxane (Tarnoform 300, a copolymer of trioxane with small amount of dioxolane). It has been demonstrated that the crystalline phase in polyamide 6 is present in two morphological forms: а-phase crystallizing in mono-, clinic system and g-phase crystallizing in pseudohexagonal system. The highest content of а-phase has been obserwed at room temperature, whereas an increase in temperature is accompanied by a decrease in а-phase and amorphous phase content with a simultaneous: increase in g -phase content to a maximum value of temperature of 210—220°C. Rising of temperature from 20 to 150 °C causes some decrease of amorphous phase content in polyamide 6, in the range of 150—230 °C it remains almost constant and at even higher temperatures its content rapidly increases. At 250 °C amorphous phase is the only form of this polymer. In the case of polytrioxane only one crystalline phase crystallizing in hexagonal formhas been observed. At room temperature its content is equal to about 65% and It gradualny decreases with the temperature rise till a complete disappearance at 190°C. The values of the regression coefficients in polynomials of third degree describing the relative content of crystalline and amorphous phase in Tarnamid T-27 and Tarnoform 309 as a function of temperature have been calculated.

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