Strain-induced crystallisation in bulk amorphous PET under uni-axial loading

Gorlier, Eric; Haudin, Jean‐Marc; Billon, Noëlle

doi:10.1016/s0032-3861(01)00497-9

Cited by 116 publications

(116 citation statements)

References 36 publications

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“…Both characteristics did not meet the criteria for invisible Table 4 Comparison of mechanical properties of PETG/PC/TPU at different blending ratios (n=5, x±s) orthodontic appliances. PETG is a modified product of PET, which has good mechanical properties, formability, fatigue resistance, and dimensional stability [10][11][12] . However, results of this study showed that the tear strength and elongation-atbreak value of PETG were 45.12 MPa and 141.22% respectively, which were inferior to Erkodur and Biolon.…”

Section: Discussionmentioning

confidence: 99%

“…Poly(ethylene terephthalate)-glycol (PETG), a noncrystallizing amorphous copolymer of polyethylene terephthalate (PET), has good mechanical properties, formability, optical qualities, fatigue resistance, and dimensional stability. For these excellent properties, PET and PETG play an important role within the rapidly growing family of thermoplastic elastomers (TPE) and their applications can be found in almost all industrial branches [10][11][12] . Polycarbonate (PC) is a very durable material and can be laminated to make bullet-proof glass.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of thermoplastic materials for invisible orthodontics

Zhang

Bai

Ding

et al. 2011

Dental Materials Journal

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PETG/PC/TPU polymer blend was prepared by mechanical blending. The mechanical properties of modified PETG/PC/TPU blend were characterized using a universal testing machine, and results were compared against two commercial thermoplastic products -Erkodur and Biolon. Blending modification improved the properties of PETG/PC/TPU. When blending ratio (wt%) was 70/10/20, PETG/PC/TPU exhibited optimal mechanical properties which exceeded those of Erkodur and Biolon. Tear strength was 50.23 MPa and elongation at break was 155.99%. Stress relaxation rate was 0.0136 N/s after 1 hour, which was significantly slower than Erkodur and Biolon (p<0.05). Water absorption rate was 0.57% after 2 weeks, which was significantly lower than Erkodur and Biolon (p<0.05).

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of thermoplastic materials for invisible orthodontics

Zhang

Bai

Ding

et al. 2011

Dental Materials Journal

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“…Numerous experiments have been performed on the crystallization dynamics during and after uniaxial extension of PET samples at T=353-363K (which is just above the glass transition temperature) after different quenching protocols (Salem 1992a(Salem , 1992b(Salem , 1998Gorlier et al 2001;Middleton et al 2001;Marco et al 2002aMarco et al , 2002b. In general, the onset of flow induced crystallization occurs at %2.5.…”

Section: Extensional Flowsmentioning

confidence: 99%

Towards a rheological classification of flow induced crystallization experiments of polymer melts

2004

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“…This effect is related with the strain induced modification of the microstructure of PET [3,4,5]. The model (Eq.1) has been identified supposing the strain and stress fields uniformity in the PET specimen.…”

Section: Nonlinear Viscous Modelmentioning

confidence: 99%

Optimization by the C-NEM Method of the Stretch-Blow Molding Process of a PET Bottle Near T g

Cosson¹,

Chevalier²,

Yvonnet³

2008

Int J Mater Form

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The stretch-blow molding process of poly(ethylene terephthalate) bottles generates some important modifications in the mechanical properties of the material. Considering, the range of temperature (T > T g ) that is usually used, the material has a very high viscosity and shows a strain hardening effect linked to the microstructure evolution. A simple visco-plastic model had been identified from experimental results of uniaxial and biaxial tensile tests [1]. In the present work, we use this model and a numerical technique to simulate the inflation of a preform under an internal pressure and also submitted to the elongation of a stretch rod. The finite elements method has a poor efficiency in the stretch-blow molding process because the final material strain is up to 300%. This strain level generates strong element distortions and necessitates to often re-mesh. In order to carry out simulations with strain higher than 300%, the constrained natural elements method (C-NEM [2]) is used. In fact, the C-NEM method allows simulation with high strain level without re-meshing. The original "mesh" can be use from the beginning to the end of the simulation. So the properties of the material can be recorded in each node, without loss of information. In a first approach C-NEM are applied to simulate and optimize stretch-blowing of a PET preform by using axis symmetric assumption, the mold is not taking into account.

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Strain-induced crystallisation in bulk amorphous PET under uni-axial loading

Cited by 116 publications

References 36 publications

Preparation and characterization of thermoplastic materials for invisible orthodontics

Preparation and characterization of thermoplastic materials for invisible orthodontics

Towards a rheological classification of flow induced crystallization experiments of polymer melts

Optimization by the C-NEM Method of the Stretch-Blow Molding Process of a PET Bottle Near T g

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