Molecular Analysis of the Mechanical Behavior of Plasticized Amorphous Polymer

Plasticization effects on the mechanical behavior were investigated on two families of materials based on poly(methyl methacrylate) (PMMA) and poly(vinyl chloride) (PVC), respectively. For this purpose, PMMA was blended with poly(vinylidene fluoride) (PVDF) by co-precipitation from solution, all over the PVDF range 0-40 wt% where the samples remain amorphous. Di-octylphtalate (DOP) was mechanically dispersed in PVC over the DOP range 0-20 wt%. The relaxation behavior of the samples was studied by differential scanning calorimetry at heating rate of 10 °Cmin-1 and by dynamic mechanical analysis at the frequency 1 Hz over the temperature range C/150 °C. Stress strain curves were recorded during compression testing at a deformation rate of 2.10-3 s-1 . Data analysis was carried out on the molecular scale; it permitted to highlight the influence of the β elaxation motions on the plastic behavior. Consideration of the non elastic part of the energy to yield was clearly related to the contribution of and motions.

[1]  Lucien Monnerie,et al.  Investigation of solid-state transitions in linear and crosslinked amorphous polymers , 2005 .

[2]  J. Halary,et al.  Thermal and mechanical behavior of amorphous and semi-crystalline poly(vinylidene fluoride)/poly(methyl methacrylate) blends , 2003 .

[3]  L. Bokobza,et al.  Effects of molecular interactions on the viscoelastic and plastic behaviour of plasticized poly(vinyl chloride) , 2003 .

[4]  D. Rana,et al.  Molecular analysis of yielding in pure and antiplasticized epoxy-amine thermosets , 2002 .

[5]  B. Brulé,et al.  Molecular analysis of the plastic deformation of amorphous semi-aromatic polyamides , 2001 .

[6]  S. Choe,et al.  On the viscoelastic and plastic behavior of semiaromatic polyamides , 1999 .

[7]  L. Čanová,et al.  On the viscoelastic and plastic behaviour of methylmethacrylate-co-N-methylglutarimide copolymers , 1999 .

[8]  C. Creton,et al.  Plasticity of polystyrene -poly(2,6,dimethy1,1,4,phenylene oxide) blends , 1999 .

[9]  P. Tordjeman,et al.  On the plastic and viscoelastic behavior of methylmethacrylate-based random copolymers , 1997 .

[10]  R. Schirrer.  Optical interferometry: Running crack-tip morphologies and craze material properties , 1990 .

[11]  J. Lefebvre,et al.  Plastic deformation of glassy amorphous polymers: influence of strain rate , 1985 .

[12]  B. Escaig.  The physics of plastic behaviour of crystalline and amorphous solids , 1978 .

[13]  J. Bauwens.  Relation between the compression yield stress and the mechanical loss peak of bisphenol-A-polycarbonate in the β transition range , 1972 .

[14]  R. E. Robertson,et al.  Theory for the Plasticity of Glassy Polymers , 1966 .

[15]  E. Jenckel,et al.  Die Erniedrigung der Einfriertemperatur organischer Gläser durch Lösungsmittel , 1953 .