Molecular orientation and young's modulus of plasticized and nonplasticized poly(vinyl chloride)

✍ Scribed by J. King; D. I. Bower; W. F. Maddams

• Publisher: John Wiley and Sons
• Year: 1988
• Tongue: English
• Weight: 455 KB
• Volume: 35
• Category: Article
• ISSN: 0021-8995
• DOI: 10.1002/app.1988.070350318

✦ Synopsis

Synopsis

The Young's moduli of samples of poly(viny1 chloride) containing either no plasticizer or 5 pph of dioctyl sebacate were drawn uniaxially at 80°C to draw ratios, A, in the range 1-3.3. The moduli, determined by a three-point bending method were found to increase monotonically with X to a value of 6.3 GPa for the nonplasticized samples and to reach a maximum value of about 4.5

GPa for the plasticized samples above X = 2.3, which showed voiding. The lower moduli of the plasticized samples for a given degree of orientation, as assessed from birefringence measurements, can be attributed to the diluent effect of the plasticizer on the load-bearing chains. The Raman measurements suggest that the crystallites probably orient rather like rigid rods in an affinely deforming matrix, with some relaxation.