Transcrystallinity in PTFE Fiber/PP composites

Chi Wang, L. M. Hwang

Research output: Contribution to journalArticle

Abstract

Transcrysallization of polypropylene (PP) on the polyetrafluoroethylene (PTFE) fiber was investigated. Based on the theory of heterogeneous nucleation, it's been found that the induction time can correlate well with the nucleation rate in determining the interfacial free energy difference function Δσ. The ratio of Δσ in the bulk matrix to that at the interface is 1.63 which implies the transcrystalline growth is favorable from a thermodynamic point of view. Effect of the transcrystallinity on the interfacial strength has been investigated using single-fiber pull-out test. Measurements of the adhesive fracture energy and the frictional stress were carried out for specimens with different transcrystalline thickness. Results show that effect of transcrystalline thickness on interfacial fracture energy is negligible. The calculated value of fracture energy for debonding is 2.1 J/m2. The presence of transcrystallity does not promote the level of adhesion However, the frictional stresses at the debonded fiber/matrix interface increase with transcrystalline thickness.

Original languageEnglish
Pages (from-to)84-85
Number of pages2
JournalAmerican Chemical Society, Polymer Preprints, Division of Polymer Chemistry
Volume37
Issue number2
Publication statusPublished - 1996 Aug 1

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Fracture energy
Polypropylenes
Fibers
Composite materials
Nucleation
Debonding
Free energy
Adhesives
Adhesion
Thermodynamics

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics

Cite this

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Transcrystallinity in PTFE Fiber/PP composites. / Wang, Chi; Hwang, L. M.

In: American Chemical Society, Polymer Preprints, Division of Polymer Chemistry, Vol. 37, No. 2, 01.08.1996, p. 84-85.

Research output: Contribution to journalArticle

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