First Evidence of Polyimide Elastomer Prepared from Polyurea and Pyromellitic Dianhydride

Asai, Kiyotsugu; Onouchi, Yukio; Inoue, Shin‐ichi; Okamoto, Hiroshi

doi:10.1246/cl.1998.227

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…Scheme shows the preparative procedure for making the elastic polyimide‐silica composites via elastic polyureas. The elastic polyurea was prepared by the bulk polymerization of PTMODA and the mixed diisocyanate (2,4‐TDI : MDI molar ratio = 4 : 1) and the IEP solutions were prepared by the reaction of the polyurea with PMDA in NMP at 165°C for 3 h, as reported in the previous paper 5. The polymer concentration in the resulting solution was adjusted to 20 wt % in NMP.…”

Section: Methodsmentioning

confidence: 99%

“…IEPs with a polyoxyalkylene soft‐segment have been investigated for application to pervaporation membranes2 and biomaterials 3. We recently reported a new approach for obtaining IEPs via elastic and high‐molecular‐weight polyurea and pyromellitic dianhydride 4, 5. Elastic polyureas are easily prepared from amino‐terminated oligomers and conventional diisocyanates, which are used as raw materials for polyurethanes and high‐performance polymers such as polyisocyanurates, polycarbodiimides, and polyamide‐imides.…”

Section: Introductionmentioning

confidence: 99%

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Preparation and properties of elastic polyimide‐silica composites using silanol sol from water glass

Inoue

Morita²,

Asai

et al. 2004

J of Applied Polymer Sci

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ABSTRACT:A new approach for obtaining elastic polyimide-silica composites using a silanol sol prepared from water glass and the imide-containing elastic polymers (IEPs) with polytetramethyleneoxide (PTMO) soft-segment was investigated. Methods of increasing the degree of compatibility between the silica phase prepared from a silanol sol and IEPs obtained via elastic polyureas were examined. Elastic polyimide-silica composites were obtained by the thermal treatment at 200°C for 4 h in vacuo after N-methyl-2-pyrrolidone was evaporated from the IEP precursor solutions to which the silanol tetrahydrofuran solution and Bis(trimethoxysilylpropyl)amine (BisA) were added. The use of BisA possessing a reaction site with a carboxylic acid group on the IEP precursors improved the degree of compatibility between the IEPs and silica. Transparent composites were obtained when the concentration of SiO 2 was below 22 wt %. FT-IR analyses confirmed that the composite was a segmented hybrid material composed of the PTMO segment, the imide segment, and SiO 2 . The silica matrix obtained via silanol sol from water glass and the silica matrix obtained by the conventional sol-gel process with an alkoxysilane were essentially the same, and there was no significant loss of silicon due to incomplete hydrolysis of the alkoxides when preparing composites via the water glass route, in contrast to the situation that can occur in the case of the sol-gel route. Dynamic mechanical and thermal analyses suggested that microphase separation between the imide segment and the PTMO segment occurred in the composites and that there was a substantial amount of phase mixing at the same time. The formation of the silica composite had a great influence on the mobility of the segmnets in the phase-mixing domain. TGA analyses indicated that the formation of the 10 wt % silica hybrid gave a composite with a 50°C higher degradation temperature.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and properties of elastic polyimide‐silica composites using silanol sol from water glass

Inoue

Morita²,

Asai

et al. 2004

J of Applied Polymer Sci

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“…Therefore, significant efforts have been made to improve their processability and solubility. We have recently succeeded in synthesizing elastic PIs, which are composites that exhibit processability and solubility, by the polyurea method2–9 and we noted an improvement in the properties of polyurethane when using elastic polyimide. We believe that this method has advantageous in terms of reactivity and formability, as it involves the synthesis of elastic polyurethane‐imides (EPUIs) via an organic–organic hybrid 10–17.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and properties of elastic polyurethane‐imide

Kogiso¹,

Inoue²

2009

J of Applied Polymer Sci

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Congenital cataract, a clinically and genetically highly heterogeneous eye disorder, is one of the significant causes of visual impairment or blindness in children. It is frequently inherited as an autosomal dominant trait. We investigated a three‐generation family of Indian origin with 12 members affected with cerulean cataract. Linkage analysis was carried out in this family using more than 100 microsatellite markers for the known cataract candidate gene loci. A positive two‐point lod score of 3.9 at θ = 0.000, indicative of linkage, was obtained with three microsatellite markers for chromosome 16. Multipoint and haplotype analysis narrowed the cataract locus to a 15.3 cM region between markers D16S518 and D16S511 that corresponds to the region 16q23.1. Direct sequencing of the candidate gene MAF, which lies in the critical linked region, revealed a novel heterozygous missense mutation in the basic region (BR) of the DNA‐binding domain. This sequence change was considered pathogenic as it segregated in all affected family members, neither seen in unaffected family members nor in 106 unrelated controls. The mutation also results in substitution of highly conserved lysine 297 by arginine (K297R) that affects a residue that forms a part of a predicted DNA‐interaction region of the protein. The association of microcornea with congenital cataract in some affected individuals further underlines the role of the MAF transcription factor in lens and anterior ocular development. Our findings expand the mutation spectrum of MAF in association with congenital cataract and highlight the genetic and phenotypic heterogeneity of congenital cataract. © 2006 Wiley‐Liss, Inc.

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“…However, a particularly interesting material is polyurethane-imide elastomer (PUIE). We focused on PUIE because it is a novel heat-resistant elastomer that is widely used for commercial products, and we were successful in improving the synthetic method for creating PUIEs [4] [9] [15]. Moreover, we focused on thermoplastic PUIEs (TPUIEs) that could be utilized as industrial materials.…”

Section: Introductionmentioning

confidence: 99%

Thermoplasticity in Polyurethane-Imide Elastomers

Ueda¹,

Inoue²

2018

OJPChem

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Polyurethane-imide elastomers (PUIEs) are formed from isocyanates, polyols, diamines, and acid anhydrides through liquid polymerization. However, thermoplastic PUIEs have rarely been reported because the synthesis of thermoplastic PUIEs remains a challenge in polymer chemistry. In this study, PUIEs were prepared from 4,4'-diphenylmethane diisocyanate, polyols (polytetramethylene glycol (Mw = 1000), polycaprolactone diol (Mw = 1000), and polycarbonate diol (Mw = 1000)), 4,4'-oxydianiline, and acid anhydrides (pyromellitic dianhydride and 4,4'-oxydiphtaric anhydride). The thermoplasticities of the resultant PUIEs were investigated, and only PUIEs synthesized using 4,4'-oxydiphtaric anhydride expressed thermoplasticity.

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First Evidence of Polyimide Elastomer Prepared from Polyurea and Pyromellitic Dianhydride

Cited by 6 publications

References 8 publications

Preparation and properties of elastic polyimide‐silica composites using silanol sol from water glass

Preparation and properties of elastic polyimide‐silica composites using silanol sol from water glass

Synthesis and properties of elastic polyurethane‐imide

Thermoplasticity in Polyurethane-Imide Elastomers

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