A New Way to Synthesize Poly(Urethane-Imide)s Based on Nitroethyl Carbamate Intermediary

Găină, Constantin; Ursache, Oana; Gaina, Viorica; Varganici, Cristian–Dragos

doi:10.1080/03602559.2014.886111

Cited by 3 publications

(2 citation statements)

References 45 publications

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“…According to the thermal degradation data, in the first stage, samples start decomposing in the temperature range 304–335 °C, not uncommon for PURs, ending in the range 322–390 °C and with mass loss values in the interval 7.97–33.5%, the highest being registered for PEUR4, attributed to urethane bonds cleavage. Cleavage of urethane bonds further initiates depolymerisation with hard segment decomposition in the second stage [ 39 ]. This is followed by complex degradation through random scissions of polymer chains together with soft segments in the third and fourth stages [ 40 , 41 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Thermal Aging on the Physico-Chemical and Optical Properties of Poly(ester urethane) Elastomers Designed for Passive Damping (Pads) of the Railway

Roşu¹,

Varganici²,

Roşu³

et al. 2021

Polymers

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The aim of this study consists of monitoring the effect of thermal aging on the physico-chemical and optical properties of poly(ester urethane) elastomers designed as damping materials for railways. The materials were obtained by polyaddition in two stages in melt, resulting in regular structures. The structural modifications during the thermal aging of the samples were monitored using FTIR, color changes, TGA in non-isothermal and isothermal conditions, DSC and physico-mechanical measurements. The structural regularity of the rigid and flexible segments maintained the good mechanical properties of the structures up to 200 h of thermal aging at the elevated temperatures of 40 °C, 70 °C, 100 °C and 130 °C. It was observed that at 40 °C and low exposure times, changes occur mainly to the carbonyl groups of the soft segments. At higher temperatures and longer exposure times urethane groups were affected. Extended thermal aging led to significant changes in thermo-mechanical and optical properties.

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Section: Resultsmentioning

confidence: 99%

Effect of Thermal Aging on the Physico-Chemical and Optical Properties of Poly(ester urethane) Elastomers Designed for Passive Damping (Pads) of the Railway

Roşu¹,

Varganici²,

Roşu³

et al. 2021

Polymers

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“…To date, however, most investigation about poly(urethane–imide)s (PUIs) has been done, which is to improve the thermal stabilities and mechanical property. 29 –33 The investigations were rarely on optical and ultraviolet (UV)-shielding properties of PUIs up until now. Hence, it is essential to evaluate the optical and UV-shielding properties, which may further expand their applications.…”

Section: Introductionmentioning

confidence: 99%

Novel hyperbranched poly(urethane–imide)s with enhanced thermal, mechanical, and UV-shielding properties

Tian

Xiao

et al. 2018

High Performance Polymers

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A series of novel hyperbranched poly(urethane–imide)s (HBPUIs) was synthesized and derived from as-prepared imide-containing glycol and commercial materials via an A2 + B2 + B3 approach. The chemical and morphological structures of the resulting polymers were evaluated by infrared attenuated total reflection and X-ray diffraction techniques, respectively. Compared with pure HBPU, HBPUIs exhibited better thermal stability with the 10% weight loss temperature of 282–298°C under nitrogen atmosphere, good mechanical property with the tensile strength of 2–19 MPa, and elongation at breaks of 461–896%. Moreover, optical transmissivity of all films was measured and the results showed that they had excellent transparency in the scope of visible light. Meanwhile, the cutoff wavelengths of as-prepared HBPUI films were at around 350 nm, which can block the whole ultraviolet (UV)-C (200–280 nm) and UV-B (280–320 nm), as well as a part of UV-A (320–400 nm). Furthermore, the designed photocatalytic degradation experiment of the methylene blue (MB) confirmed that HBPUI films had good UV-shielding performance with 70% degradation of MB after intense UV irradiation (400 W) for 50 min under the protection of HBPUI film with 14% imide-containing glycol. This endowed HBPUIs with potential applications prospect in UV-shielding materials.

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Synthesis and properties of polyurethane urea with pyridine-2,6-dicarboxamide moieties in their structure

2016

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A New Way to Synthesize Poly(Urethane-Imide)s Based on Nitroethyl Carbamate Intermediary

Cited by 3 publications

References 45 publications

Effect of Thermal Aging on the Physico-Chemical and Optical Properties of Poly(ester urethane) Elastomers Designed for Passive Damping (Pads) of the Railway

Effect of Thermal Aging on the Physico-Chemical and Optical Properties of Poly(ester urethane) Elastomers Designed for Passive Damping (Pads) of the Railway

Novel hyperbranched poly(urethane–imide)s with enhanced thermal, mechanical, and UV-shielding properties

Synthesis and properties of polyurethane urea with pyridine-2,6-dicarboxamide moieties in their structure

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