Structural Aspects of the Damage Tolerance of Spectra Fibres and Composites

Prevoršek, D. C.

doi:10.1002/9783527615056.ch15

Cited by 3 publications

(1 citation statement)

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“…wt. was the attempt to apply the gel-spining technique to PET similarly to polyethylene where fibers with outstanding mechanical properties have been manufactured [4]. The materials studied in the present work were synthesized with this purpose in mind, following the reports on synthesis of PET with mol.…”

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confidence: 99%

Influence of molecular weight on the microhardness of poly(ethylene terephthalate)

Vanderdonckt

Krumova

Calleja

et al. 1998

Colloid & Polymer Science

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Poly(ethylene terephthalate) (PET) was annealed in vacuum at different temperatures (190-260°C) for different times (10 min-24 h) in order to examine the mechanical properties (microhardness) of PET samples with a wide range of molecular weights (10 000-120 000). Short annealing times result in a twofold decrease in mol. wt. due to hydrolytic decomposition. However, long annealing times give rise to a substantial molecular weight increase. It is found that microhardness (H) rises linearly with the degree of crystallinity obtained during up-grading of mol. wt. and its extrapolation leads to H-values of completely crystalline PET, H.#2 "405 MPa for samples with conventional mol. wt. and of 426 MPa for samples with mol. wt. higher than 30 000. It is shown that the increase of mol. wt. for each set of samples with a given range of degree of crystallinity also causes a slight increase of H. The influence of mol. wt. upon hardness is discussed in the light of the changes in the physical structure (crystallinity, crystal thickness) which is formed at given heat treatment conditions.

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confidence: 99%