Poly(urethane-imide-imide), a new generation of thermoplastic polyurethane elastomers with enhanced thermal stability

Yeganeh, Hamid; Shamekhi, Mohammad Amin

doi:10.1016/j.polymer.2003.11.006

Cited by 128 publications

(65 citation statements)

References 38 publications

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“…5 For instance, elevated temperatures can hasten the oxidation of polymers, resulting in a measurable increase in their modulus, or stiffness. 24,25 Furthermore, polyurethanes have been observed to undergo physiochemical changes due to water hydrolysis, leading to swelling and irreversible degradation, which may support the results in the current study of increased stiffness observed with the cleaning methods of 2.5% vinegar solution and toothbrushing. 9 Toothbrushing of the polyurethane specimens with double-distilled water elicited the greatest change in light transmittance.…”

Section: Discussionsupporting

confidence: 87%

Long-term effects of seven cleaning methods on light transmittance, surface roughness, and flexural modulus of polyurethane retainer material

Agarwal

Wible

Ramir

et al. 2018

The Angle Orthodontist

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Objectives: To evaluate the long-term effects of seven different cleaning methods on light transmittance, surface roughness, and flexural modulus of a polyurethane retainer material. Materials and Methods: Polyurethane retainer specimens (Viverat, Align Technology Inc) (70 specimens, n ¼ 10 per method, 50.8 mm 3 12.7 mm 3 1.0 mm) were exposed to seven cleaning methods twice a week for 6 months. Before treatment and after 6 months, light transmittance, surface roughness, and flexural modulus of the specimens were quantified. Qualitative assessment of randomly selected specimens from each solution was performed at baseline and after 6 months using a scanning electron microscope. Statistical analyses were performed at the .05 significance level. Results: Of the three test variables, light transmittance through the specimens was the only one that changed significantly from baseline to 6 months for all cleaning solutions, with all of them causing a decrease. However, except for 0.6% sodium hypochlorite showing a change in surface roughness values and 2.5% vinegar and toothbrushing showing an increase in flexural modulus, none of the other four cleaning methods resulted in significant changes in surface roughness or flexural modulus values for the polyurethane specimens between baseline and after 6 months. Conclusions: Of the seven cleaning methods, Invisalignt cleaning crystals, Polidentt, and Listerinet showed the least amount of change in light transmittance values for the polyurethane specimens over 6 months, and they had no effect on surface roughness and flexural modulus values. (Angle Orthod. 2018;88:355-362.)

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Section: Discussionsupporting

confidence: 87%

Long-term effects of seven cleaning methods on light transmittance, surface roughness, and flexural modulus of polyurethane retainer material

Agarwal

Wible

Ramir

et al. 2018

The Angle Orthodontist

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“…One of the important approaches is the chemical modification of its structure by blending or copolymerizing with more thermally stable polymers such as PDMS (Wang et al, 2000) or polyimide (PI) (Yeganeh and Shamekhi, 2004). However, the incorporation of PDMS leads to a decrease in the mechanical properties, whereas PI imparts poor solubility.…”

Section: Effect Of Pdms On Thermal Properties Of Pumentioning

confidence: 99%

Structure-Gas Transport Property Relationships of Poly(dimethylsiloxane-urethane) Nanocomposite Membranes

Reddy¹,

Gnanasekar²

2011

Advances in Nanocomposites - Synthesis, Characterization and Industrial Applications

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“…Moreover, their thermal stabilities have been studied so far. [16][17][18][19][20] But only a few studies have been reported on fluorescence and electrochemical properties of (PUIs) up till now. [21,22] This properties of PUIs, thus, still need to research with new contributions.…”

Section: Introductionmentioning

confidence: 99%

Thermal, fluorescence, and electrochemical characteristics of novel poly(urethane-imide)s

Avcı

Şirin

2013

Designed Monomers and Polymers

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In this study, the novel thermally stable poly(urethane-imide)s (PUIs) were synthesized. The structures of the obtained polymers were confirmed by FT-IR and NMR techniques. The molecular weight distribution parameters of the synthesized PUIs were determined by the size exclusion chromatography (SEC). The synthesized PUIs were also characterized by solubility tests, solution viscosity, TG-DTA, and DSC analyses. Cyclic voltammetry measurements were carried out, and HOMO-LUMO energy levels and electrochemical band gaps (E 0 g ) were calculated from their absorption edges. Additionally, optical band gaps (E g ) were determined by using UV-vis spectra of the materials. Fluorescence measurements were carried out in various concentrated DMSO solutions to determine the optimum concentrations to obtain the maximal PL intensities. Also, morphological characterizations were made by scanning electron microscopy technique.

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Poly(urethane-imide-imide), a new generation of thermoplastic polyurethane elastomers with enhanced thermal stability

Cited by 128 publications

References 38 publications

Long-term effects of seven cleaning methods on light transmittance, surface roughness, and flexural modulus of polyurethane retainer material

Long-term effects of seven cleaning methods on light transmittance, surface roughness, and flexural modulus of polyurethane retainer material

Structure-Gas Transport Property Relationships of Poly(dimethylsiloxane-urethane) Nanocomposite Membranes

Thermal, fluorescence, and electrochemical characteristics of novel poly(urethane-imide)s

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