Time dependent deformation behavior of thermoplastic elastomers

Le, H. H.; Lüpke, T.; Pham, Tung; Radusch, H.‐J.

doi:10.1016/s0032-3861(03)00409-9

Cited by 27 publications

(35 citation statements)

References 14 publications

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“…As shown in our previous work [4], the stress relaxation behavior is strongly determined by the crystalline phase of TPV. Using DSC the crystallization temperature T c , melting temperature T m , and degree of crystallinity X c of the PP phase in TPV were investigated and the results are summarized in Table 4.…”

Section: Morphology Characterization Of Oil Extended Tpvsupporting

confidence: 61%

“…Relaxation curves for all the samples were recorded at a draw ratio of λ = 1.5 (ε = 50%) within the temperature range from 30 to 120°C over a period of 30 minutes to 15 hours depending on test temperature and oil content. The two-component model used in the present study has been described in a previous work [4]. No steady state stress value was observed even after 15 hours.…”

Section: Morphology Characterization Thermal and Mechanical Testingmentioning

confidence: 98%

“…Residual strain measured from hysteresis experiments two-component model [4]. To evaluate the relaxation curve, the applied stress σ is separated into two components, a relaxing stress component Δσ and a non-relaxing stress component σ ∞ according to Equation ( …”

Section: Stress Relaxation Behavior Of Neat Tpvmentioning

confidence: 99%

“…The addition of extender oil alters the viscoelastic properties of these heterogeneous thermoplastic vulcanizates significantly. Although the viscoelastic behavior of heterogeneous thermoplastic-rubber systems was already investigated [4][5][6][7], the influence of the extender oil on the relaxation behavior of such systems was not sufficiently investigated so far. In the present work the two-component model [8][9][10] was used to characterize the effect of extender oils on the stress relaxation behavior of TPV by correlating the structural features and the effect of oil content, polarity and distribution on it.…”

Section: Introductionmentioning

confidence: 99%

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Effect of extender oils on the stress relaxation behavior of thermoplastic vulcanizates

Le¹,

Zia²,

Ilisch³

et al. 2008

Express Polym. Lett.

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Abstract. The long term mechanical behavior of oil extended thermoplastic vulcanizates (TPV) based on polypropylene (PP) and acrylonitrile-butadiene rubber (NBR) has been characterized by means of stress relaxation experiments. The morphology of TPV and the phase specific oil distribution which depend on the content and type of oil as well as on the mixing regime have been characterized by means of Atomic Force Microscopy (AFM), Dynamic Mechanical Thermal Analysis (DMTA) and Differential Scanning Calorimetrie (DSC). The discussion of the stress relaxation behavior was carried out using the two-component model, which allows splitting the initial stress into two components: a thermal activated stress component and an athermal one. A master curve was created by shifting the relaxation curves vertically and horizontally towards the reference curve. The vertical shift factor bT is a function of the temperature dependence of the athermal stress components. It was found that the oil distribution strongly affects the athermal stress component which is related to the contribution of the structural changes, e.g. crystallinity of the PP phase and the average molecular weight between the crosslinks of the NBR phase. From the temperature dependence of the horizontal shift factor aT the main viscoelastic relaxation process was determined as the α-relaxation process of the crystalline PP phase. It is not dependent on the polarity and content of the oil as well as the mixing regime.

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Section: Morphology Characterization Of Oil Extended Tpvsupporting

confidence: 61%

Section: Morphology Characterization Thermal and Mechanical Testingmentioning

confidence: 98%

Section: Stress Relaxation Behavior Of Neat Tpvmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of extender oils on the stress relaxation behavior of thermoplastic vulcanizates

Le¹,

Zia²,

Ilisch³

et al. 2008

Express Polym. Lett.

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“…TPEs can be stretched, and unlike rubber-like elastomers, they can be processed without curing or vulcanization because they are true thermoplastics. Conventional thermoplastic techniques such as injection molding, blow molding, and extrusion may be used in TPE processing (Chang et al 2006;Puskas et al 2010;Le et al 2003;Papke and Karger-kocsis 2001;Asami and Nitta 2004). Blends of thermoplastics such as HDPE and amorphous soft rubber such as EPDM are usually found in packing, kitchenware, toys, furniture, and electronics (Maysa et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Properties of Kenaf Bast Powder-Filled High Density Polyethylene/Ethylene Propylene Diene Monomer Composites

2013

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High-density polyethylene (HDPE)/ethylene-propylene-diene monomer (EPDM) blend was prepared by mixing HDPE and EPDM in an internal mixer. Kenaf fibers were then added to the mixture with a few minutes of mixing. The tensile properties of the HDPE/EPDM/kenaf composites were investigated using tensile testing and scanning electron microscopy. Treated kenaf bast powder was prepared using hydrochloric acid (HCl). Hydrolysis was carried out to study the effect of HCl on the structure, composition, and properties of the fibers. HCl treatment removed the impurities in the fibers, resulting in smooth fibers with a small particles size. Fourier transform infrared analysis showed a reduction in lignin, wax, and hemicellulose but no modification in surface chemical composition. The treated filled HDPE/EPDM composites had high tensile strength, elongation at break, and modulus than the untreated filled HDPE/EPDM composites.

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Tensile and elastic properties of triblock copolymer based on aramide end‐segments and polyether mid‐segments

Arun

Gaymans

2008

J of Applied Polymer Sci

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The tensile and elastic behavior of triblock copolymers containing uniform aramide (TUB) hard endsegments (HS) and poly(tetramethylene oxide) (PTMO, M n ¼ 2900 g/mol) soft segments (SSs) was studied. The molecular weight of the copolymer was varied by changing the length of the soft mid-segment; by extending the PTMO 2900 with terephthalate units, the SS length was increased from 2900 g/mol to 21,000 g/mol and concurrently the aramide concentration decreased from 18 to 3 wt %. The mechanical properties were investigated by means of tensile testing, stress relaxation (SR) experiments, and cyclic tensile set (TS) tests. The E-modulus was found to increase with increasing aramide content. The low molecular weight copolymers were brittle whereas the high molecular weight copolymers displayed large fracture strain values. The transition from brittle to ductile seemed to occur at a triblock copolymer molecular weight of 6600 g/mol. A strain-induced crystallization was observed at strains above 250%, and both the fracture strain and stress were found to be highly dependant on the molecular weight of the copolymer. Cyclic tensile experiments showed that the materials had low TS values up to the strain hardening point. On the other hand, the SR data at 10% strain seemed to be little dependant on the molecular weight. The higher molecular weight copolymers did not display lower SR values than their low molecular weight counterparts.

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Time dependent deformation behavior of thermoplastic elastomers

Cited by 27 publications

References 14 publications

Effect of extender oils on the stress relaxation behavior of thermoplastic vulcanizates

Effect of extender oils on the stress relaxation behavior of thermoplastic vulcanizates

Properties of Kenaf Bast Powder-Filled High Density Polyethylene/Ethylene Propylene Diene Monomer Composites

Tensile and elastic properties of triblock copolymer based on aramide end‐segments and polyether mid‐segments

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