Copolymer of poly(parabanic acid) and polyimide

Caraculacu, Georgeta; Scortanu, Elena; Caraculacu, Adrian A.

doi:10.1002/pol.1983.130210408

Cited by 12 publications

(10 citation statements)

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“… alkyl isocyanates with oxamidesters,4, 5 aryl isocyanates with N ‐aryl‐substituted oxamide‐ sters,6, 7 polyureas,8–10 or polycarbodiimides,11–13 with oxalyl chloride, 4,4′‐(hexamethylene‐1,6‐diyl)bis(2,4,5‐trioxoimi‐ dazolidine‐1,3‐diyl)dibenzoyl dichloride with bis‐ phenols 14 It is worth noting that in the resulting polymers, aromatic rings, mostly benzene or naphthalene, are also present.…”

Section: Introductionmentioning

confidence: 99%

Reaction products of parabanic acid and alkylene carbonates as components of polyurethane foams

Zarzyka‐Niemiec

2007

Polymer International

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Esteramidoimidotetraols are obtained by reacting 8‐ and 12‐molar excess of ethylene carbonate or propylene carbonate with parabanic acid. The parabanic acid ring undergoes opening, and linear polymeric products are formed. The products can conveniently be used as polyols for polyurethane foams. The results of a study on thermal stability and on compressive strength of foams prepared from these tetraols, measured before and after thermal treatment, are reported. Copyright © 2007 Society of Chemical Industry

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Section: Introductionmentioning

confidence: 99%

Reaction products of parabanic acid and alkylene carbonates as components of polyurethane foams

Zarzyka‐Niemiec

2007

Polymer International

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“…At the same temperature, an increase in the conversion generated a gradual decrease in the unstable chlorine content until it reached stability because many low‐molecular‐weight polymers, which were produced by the local hot spots in the early stage of polymerization, contained more unstable chlorine structures . An increase in the conversion stabilized the reaction system and generated an increase in the molecular weight and a decrease in the unstable chlorine structure .…”

Section: Resultsmentioning

confidence: 99%

The influence of two‐stage variable temperature suspension polymerization on polyvinyl chloride resin: The molecular chain segment structure and thermal stability

Geng

Wang

et al. 2018

Vinyl Additive Technology

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The suspension polymerization of polyvinyl chloride (PVC) was carried out at two different constant temperature conditions (52.5°C and 57.5°C) and at two‐stage variable temperature conditions (52.5–57.5°C). The molecular weight and molecular weight distribution were characterized by gel permeation chromatography (GPC). The unstable chlorine content, total double bond content, and conjugated diene content were explored via phenol substitution, catalytic bromine addition, and ultraviolet–visible spectroscopy (UV–Vis). pH meter and thermogravimetric analyzer (TGA) were used for the determination of the thermal stability. According to the results, due to the gradual consumption of the impurities and the effect of the local high temperature in the early stage of polymerization, which caused more molecular chain‐transfer and more structural defects, a large number of oligomers generated. A rapid increase in the molecular weight could be found until the conversion was close to 23%. A lower temperature should be conducive to reducing the structural defects in molecular segments. Based on these observations, we applied two‐stage variable temperature polymerization and compared the PVC resin at a similar molecular weight at a constant temperature of 56°C. The PVC resin produced by the two‐stage variable temperature polymerization process obtained a similar Polydispersity index (PDI), reduced the unstable chlorine content by 15.11%, reduced the total double bond structure content by 8.81%, reduced the conjugated diene structure content by 13.86%, and increased the thermal stability time by 13.91%, thereby improving the thermal stability of the PVC resin. J. VINYL ADDIT. TECHNOL., 25:E80–E87, 2019. © 2018 Society of Plastics Engineers

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“…Exceptions are polyimides 7e and 8e which are soluble, respectively partially soluble, in dipolar aprotic solvents (NNP, DMF, DMSO, formamide). Introduction of parabanic units in the macromolecular chain increases the polymer solubility [24].…”

Section: Resultsmentioning

confidence: 99%

Polyimides Containing 1, 4-Dithiine Units and their Corresponding Thiophene 2, 3, 4, 5 Tetracarboxylimide Units

Găină¹,

Gaina²,

Sava³

et al. 1999

High Performance Polymers

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Copolymer of poly(parabanic acid) and polyimide

Cited by 12 publications

References 0 publications

Reaction products of parabanic acid and alkylene carbonates as components of polyurethane foams

Reaction products of parabanic acid and alkylene carbonates as components of polyurethane foams

The influence of two‐stage variable temperature suspension polymerization on polyvinyl chloride resin: The molecular chain segment structure and thermal stability

Polyimides Containing 1, 4-Dithiine Units and their Corresponding Thiophene 2, 3, 4, 5 Tetracarboxylimide Units

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