The effect of annealing on the elastoplastic and viscoelastic responses of isotactic polypropylene

Details The effect of annealing on the elastoplastic and viscoelastic responses of isotactic polypropylene The effect of annealing on the elastoplastic and viscoelastic responses of isotactic polypropylene

2002-03-06

arxiv.org/abs/cond-mat/0203116v1

Physics

Condensed Matter

Materials Science

29 pages, 14 figures

Scientific paper

Observations are reported on isotactic polypropylene (i) in a series of tensile tests with a constant strain rate on specimens annealed for 24 h at various temperatures in the range from 110 to 150 C and (ii) in two series of creep tests in the sub-yield region of deformation on samples not subjected to thermal treatment and on specimens annealed at 140 C. A model is developed for the elastoplastic and nonlinear viscoelastic responses of semicrystalline polymers. A polymer is treated an equivalent transient network of macromolecules bridged by junctions (physical cross-links, entanglements and lamellar blocks). The network is assumed to be highly heterogeneous, and it is thought of as an ensemble of meso-regions with different activation energies for separation of strands from temporary nodes. The elastoplastic behavior is modelled as sliding of meso-domains with respect to each other driven by mechanical factors. The viscoelastic response is attributed to detachment of active strands from temporary junctions and attachment of dangling chains to the network. Constitutive equations for isothermal uniaxial deformation are derived by using the laws of thermodynamics. Adjustable parameters in the stress-strain relations are found by fitting the experimental data.

Affiliated with

Also associated with

No associations

Rating

The effect of annealing on the elastoplastic and viscoelastic responses of isotactic polypropylene does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The effect of annealing on the elastoplastic and viscoelastic responses of isotactic polypropylene, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The effect of annealing on the elastoplastic and viscoelastic responses of isotactic polypropylene will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-124579