The Glass Transition Temperature of Polyethylene

Gaur, Umesh; Wunderlich, Bernhard

doi:10.1021/ma60074a045

Cited by 129 publications

(88 citation statements)

References 4 publications

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“…Thus the previous studies [6][7][8][9] for this model are at a temperature T = ε/k B > 2T g . This is comparable to experimental studies of many common polymers such as polyethylene, 32,33 polypropylene, 34 and polydimethysiloxane 35 which are often studied for T ∼ 2 − 3T g .…”

supporting

confidence: 82%

Communication: Polymer entanglement dynamics: Role of attractive interactions

Grest

2016

The Journal of Chemical Physics

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The coupled dynamics of entangled polymers which span a broad time and length scales govern the unique viscoelastic properties of polymers. To follow chain mobility by numerical simulations from the intermediate Rouse and reptation regimes to the late time diffusive regime, highly coarse grained models with purely repulsive interactions between monomers are widely used since they are computationally the most efficient. Here using large scale molecular dynamics

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supporting

confidence: 82%

Communication: Polymer entanglement dynamics: Role of attractive interactions

Grest

2016

The Journal of Chemical Physics

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“…It is the reason why, shift in the β-relaxation for PVDF ( Figure 6) may not be directly compared to the observations for the PVDF/CPL blends (Figures 7 and 8). Broadness of the β-transition of the unannealed PVDF has been proposed to reflect a large spectrum of constraints on the molecular mobility in the amorphous phase [31][32]. Figure 6 shows that annealing increases the asymmetry of the β-transition peak, to the point where it appears now to result from the overlap of two contributions tentatively assigned to the constrained chain segments (at ca.…”

Section: Discussionmentioning

confidence: 99%

“…polyethylene (PE) and PVDF, is comparatively small, e.g. less than 10% in linear PE [22][23][24]. However, according to Loufakis and Wunderlich [25] there would be no detectable rigid amorphous component above the PVDF glass transition.…”

Section: Introductionmentioning

confidence: 99%

D.m.a. and d.s.c. investigations of the β transition of poly(vinylidene fluoride)

Liu

Maréchal

Jérôme

1997

Polymer

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The origin of the β transition in poly(vinylidene fluoride) (PVDF) is still a pending question. This transition has been studied by dynamic mechanical analysis (d.m.a.) and differential scanning calorimetry (d.s.c.) in dependence on sample annealing and dilution with e-caprolactam (CPL). The β transition temperature is increased upon annealing and thus influenced by the polymer crystallization. Upon addition of CPL, there is no systematic shift in the β transition temperature, in contrast to the PVDF crystallinity that increases steadily. A shoulder on the low temperature side of the β transition peak is also observed as a result of annealing. It is shifted to lower temperatures when CPL is added, consistently with a glass transition. It thus appears that the so-called β-transition is sensitive to the amorphous material, but in a close relationship with the polymer crystallization. Comparison of the observations by d.s.c, and d.m.a, shows that the broad transition observed for the unannealed samples would result from the overlap of two transitions: the glass transition of the unconstrained amorphous phase and the glass transition of chains constrained by the crystalline phase. This situation can account for the complex dependence of the β transition on the polymer history.

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“…However, Tg of the blend with PS/TMPC = 10/90 w/w was 193 °C, 6°C higher than the prediction 1187 °C) of Equation (2) and 7 °C higher than the Tg (186 °C) of the same blend after annealing at 210 °C. This implies the existence of a second, PS-rich phase not revealed by the routine DSC scan, As has been shown by Gaur and Wunderlich [18], indistinct glass transitions of (micro)phase separated blend can be enhanced by inducing an excess enthalpy peak (i.e., the hysteresis peak due to physical aging [119]). This can be achieved by heating the sample at a rate faster than the previous cooling rate [18] or selective annealing of one or both phases below the corresponding Tg [20].…”

Section: Ps/tmpc Binary Blendsmentioning

confidence: 83%

A miscibility study of ternary blends of polystyrene, tetramethylbisphenol-A polycarbonate, and poly(2,6-dimethyl-1,4-phenylene oxide)

Fried

1994

J Polym Res

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Phase behaviorof ternary blends of polystyrene (PS), tetramethylbisphenol-A polycarbonate (TMPC), and poly(2,6-dimethyl-l,4-phenylene oxide) (PPO) at two different temperatures (i.e., 210 and 300 °C, respectively) was studied by means of differential scanning calorimetry. Miscibility of the ternary blends at either temperature was found restricted to limited compositions, in agreement with simulated spinodal curves based on published values of interaction parameters. The limited ability of PS, which is separately miscible with TMPC and PPO at 210 °C, to act as a conamon 'solvent' for the immiscible TMPC/PPO pair at this temperature was explained in terms of the disparity in PS/TMPC and PS/PPO pair interactions (i.e., the 'IAzI effect').

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The Glass Transition Temperature of Polyethylene

Cited by 129 publications

References 4 publications

Communication: Polymer entanglement dynamics: Role of attractive interactions

Communication: Polymer entanglement dynamics: Role of attractive interactions

D.m.a. and d.s.c. investigations of the β transition of poly(vinylidene fluoride)

A miscibility study of ternary blends of polystyrene, tetramethylbisphenol-A polycarbonate, and poly(2,6-dimethyl-1,4-phenylene oxide)

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