scholarly journals Long-term stress relaxation behavior of predrawn poly(ethylene terephthalate)

2014 ◽  
Vol 131 (23) ◽  
pp. n/a-n/a ◽  
Author(s):  
T. Hazelwood ◽  
A. D. Jefferson ◽  
R. J. Lark ◽  
D. R. Gardner
Keyword(s):  
Stress Relaxation ◽  
Ethylene Terephthalate ◽  
Relaxation Behavior ◽  
Stress Relaxation Behavior ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene

Long-term stress relaxation behavior of Polyaniline-EPDM blends using the time-temperature-strain superposition method

2018 ◽  
Vol 6 (2) ◽  
pp. 025318 ◽  
Author(s):  
Muhammad Shafiq Irfan ◽  
Yasir Qayyum Gill ◽  
Motahira Hashmi ◽  
Sana Ullah ◽  
Farhan Saeed ◽  
...  
Keyword(s):  
Stress Relaxation ◽  
Relaxation Behavior ◽  
Superposition Method ◽  
Stress Relaxation Behavior ◽  
Temperature Strain

Modeling Stress-Relaxation Behavior of the Periodontal Ligament During the Initial Phase of Orthodontic Treatment

2013 ◽  
Vol 135 (9) ◽  
Author(s):  
Dan L. Romanyk ◽  
Garrett W. Melenka ◽  
Jason P. Carey
Keyword(s):  
Stress Relaxation ◽  
Periodontal Ligament ◽  
Orthodontic Treatment ◽  
Viscoelastic Model ◽  
Relaxation Behavior ◽  
Stress Relaxation Behavior ◽  
Cubic Form ◽  
Viscoelastic Models ◽  
Applied Forces

The periodontal ligament is the tissue that provides early tooth motion as a result of applied forces during orthodontic treatment: a force-displacement behavior characterized by an instantaneous displacement followed by a creep phase and a stress relaxation phase. Stress relaxation behavior is that which provides the long-term loading to and causes remodelling of the alveolar bone, which is responsible for the long-term permanent displacement of the tooth. In this study, the objective was to assess six viscoelastic models to predict stress relaxation behavior of rabbit periodontal ligament (PDL). Using rabbit stress relaxation data found in the literature, it was found that the modified superposition theory (MST) model best predicts the rabbit PDL behavior as compared to nonstrain-dependent and strain-dependent versions of the Burgers four-parameter and the five-parameter viscoelastic models, as well as predictions by Schapery's viscoelastic model. Furthermore, it is established that using a quadratic form for MST strain dependency provides more stable solutions than the cubic form seen in previous studies.

scholarly journals Assessment of IsPETase-Assisted Depolymerization of Terephthalate Aromatic Polyesters and the Effect of the Thioredoxin Fusion Domain

2021 ◽  
Vol 11 (18) ◽  
pp. 8315
Author(s):  
Paula Wagner-Egea ◽  
Virginia Tosi ◽  
Ping Wang ◽  
Carl Grey ◽  
Baozhong Zhang ◽  
...  
Keyword(s):  
Experimental Data ◽  
Ethylene Terephthalate ◽  
Computational Analysis ◽  
Butylene Terephthalate ◽  
Environmental Threat ◽  
Poly Ethylene Terephthalate ◽  
Fusion Domain ◽  
Poly Ethylene ◽  
Socioeconomic Benefits

Terephthalate polyesters such as poly(ethylene terephthalate) (PET) have been massively produced over the last few decades due to their attractive properties in multiple applications. However, due to their limited biodegradability, they have accumulated in landfills and oceans, posing an environmental threat. Enzymatic recycling technologies are predicted to generate long-term socioeconomic benefits. In the present work, we compared the IsPETase (from Ideonella sakaiensis 201-F6) activity on a series of polyesters, including poly(butylene) terephthalate (PBT), poly(hexamethylene) terephthalate (PHT) and Akestra™, with PET. The IsPETase showed remarkable activity toward PET (39% degradation of the original polyester) that was higher than that toward Akestra™ (0.13%), PBT (0.25%) and PHT (0.13%) after 72 h. Thus, based on experimental data and computational analysis, we report insights into IsPETase activity on a series of terephthalate-based polyesters. Aside from that, the fusion domain (Trx) effect in the production and activity of a recombinant Trx-IsPETase is reported.

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