Effect of Annealing Conditions on Molecular Structure and Physical Properties of Polypropylene Slit-Film Yarns 


Vol. 50,  No. 3, pp. 174-179, Jun.  2013
10.12772/TSE.2013.50.174


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  Abstract

The effects of various annealing temperatures and durations on the structure and physical properties of polypropylene (PP) slit-film yarns were investigated. Annealing led to a more developed crystal structure, even when the yarns were drawn before heat treatment. Annealing at 140 oC led to better developed crystal structures than that at 100 oC. Annealing primarily affected the crystalline structure, whereas little change was observed in the molecular orientation of the yarns. The slit-film yarns annealed at 140 oC showed less than 1% shrinkage. A very low-shrinkage slit-film yarn was obtained on annealing for 10 min at 140 oC or 20 min at 100 oC.

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pISSN : 1225 - 1089
eISSN : 2288 - 6419

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