Mode II delamination testing in uniaxially oriented PVC pipes

West, D. B.; Truss, R. W.

doi:10.1023/b:jmsc.0000021455.98087.c0

Cited by 2 publications

(1 citation statement)

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“…The benefits of molecular orientation on mechanical properties are well known since the eighties, leading for instance to the development of oriented PVC pipes. 15,16 To study the effects of such orientation phenomena, Hitt and Gilbert 17,18 developed a specific stretching device, and were able to evidence an increase in the falling weight impact performance with the draw ratio. However, the effects of orientation in more conventional processes (extrusion, injection, milling) are not well described in the literature.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical history effects on rigid PVC microstructure and impact properties

Fillot

Hajji

Gauthier

et al. 2007

J of Applied Polymer Sci

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Rigid PVC microstructure strongly depends on processing conditions: under both shear and heat influence, gelation process occurs, and the resulting morphology can be characterized by the so-called gelation level parameter. But thermomechanical history also affects several other features of the microstructure. In this work, two different aspects mainly related to (i) orientation and (ii) molecular mobility are pointed out, and their respective effects on poly(vinyl chloride) (PVC) impact properties are described. Charpy impact tests have been carried out on a typical extruded window profile formulation, evidencing a strong anisotropy effect in those extrudates. It turned out that modulated differential scanning calorimetry was able to evidence macromolecular orientation. Then, the effects of heat treatments on impact properties were investigated.Below the glassy transition temperature (T g ) of PVC, physical ageing results in a decrease of the impact performance, without affecting PVC anisotropy. The reason of this performance loss is the reduction of the molecular mobility, as evidenced by dynamical mechanical analysis experiments. After performing a heat treatment above T g , another important decrease of the impact performance was observed. This decrease was attributed to (i) partial disorientation of the PVC macromolecular chains and (ii) reduction of the molecular mobility.

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Section: Introductionmentioning

confidence: 99%