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E. Balcerzyk, E. Wesołowska, W. Kozłowski, W. Lewaszkiewicz


The effect of low-molecular-weight substances in fibres on their sonic modulus


Polimery 1982, No 9, 357



DOI: dx.doi.org/10.14314/polimery.1982.357

Summary

The presence of low-molecular-weight substances — wa­ter, dyestuff and monomer — affects the Young modulus of fibres. Studies have been carried out on PA-6, PET and cellulosic fibres. The sonic modulus has been measured by means of the Dynamic Modulus Tester PPM-5R (USA), adap­ted for measurements in a controlled-humidity atmosphere in the range from 0 to 100 % R.H. The conservative modulus has been measured with the Rheovibron DDV-II viscoela- stometer (Japan), adapted for measurements In liquid me­dium. Velocity of sound (C11) has been measured for isotro­pic PA-6 fibres in function of the degree of crystallinity and humidity. The moduli of the ideally oriented amorphous and crystalline regions, Ea and Ec as well as those of fibres in the range from 0 to 100% R.H. have been calculated. The effect of the low-molecular-weight compounds, in particular of water, on the Young modulus of fibres depends on the character of interactions in the polymer-water system and is particularly pronounced in case of amorphous fibres. In precise measurements, a two-phase system is to be used and both the humidity content and degree of crystallinity taken into account.


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