Condensation polymers from diisocyanates with dihydrazides and hydrazine

Campbell, Tod W.; Foldi, Veronika S.; Faragó, J.

doi:10.1002/app.1959.070020504

Cited by 32 publications

(17 citation statements)

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“…Unfortunately, above 500°C, the degradation of PUs occurs during the TGA study because of the high content of dihydrazide unit in the main chain, which prevented the further study 27…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of novel polyurethanes based on N¹,N⁴‐bis[(4‐hydroxyphenyl)methylene]succinohydrazide hard segment

Raghu

Gadaginamath

priya

et al. 2008

J of Applied Polymer Sci

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Objective The protective effect of HLA–DRB1 alleles on the development of rheumatoid arthritis (RA) is poorly understood. The aim of this study was to perform a meta‐analysis of 4 European populations to investigate which HLA–DRB1 alleles are associated with protection in anti–citrullinated protein antibody (ACPA)–positive RA and ACPA‐negative RA. Methods Data for >2,800 patients and >3,000 control subjects for whom information on HLA–DRB1 typing and ACPA status was available were collected from 4 European countries: Norway, Sweden, The Netherlands, and Spain. The odds ratios (ORs) and 95% confidence intervals (95% CIs) associated with the different HLA–DRB1 alleles were analyzed in a combined meta‐analysis focused on protective alleles and classifications. The analysis of ACPA‐positive RA was stratified for the shared epitope (SE) alleles, to correct for skewing due to this association. Results In ACPA‐positive RA, the only alleles that conveyed protection after stratification for SE were HLA–DRB1*13 alleles (OR 0.54 [95% CI 0.38–0.77]). The protective effect of the allele classifications based on the DERAA and D70 sequences was no longer present after exclusion of DRB1*13 (for D70, OR 0.97 [95% CI 0.75–1.25]), indicating that DRB1*13, rather than the DERAA or D70 sequence as such, is associated with protection. Among the DRB1*13 alleles, only DRB1*1301 was associated with protection (OR 0.24 [95% CI 0.09–0.59]). Protection appeared to follow a north‐to‐south gradient, with the strongest association in northern European countries. In ACPA‐negative RA, there were no robust associations with HLA–DRB1 alleles. Conclusion Our data do not support any of the classifications of protective alleles and indicate that protection against ACPA‐positive RA is predominantly associated with HLA–DRB1*1301.

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“…Unfortunately, above 500°C, the degradation of PUs occurs during the TGA study because of the high content of dihydrazide unit in the main chain, which prevented the further study 27…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of novel polyurethanes based on N¹,N⁴‐bis[(4‐hydroxyphenyl)methylene]succinohydrazide hard segment

Raghu

Gadaginamath

priya

et al. 2008

J of Applied Polymer Sci

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“…10 The rigid biphenolic unit is the repeating unit followed by a flexible space (in this case short aliphatic chain) is reported to be able to impart liquid crystalline properties to polyesters. 7 Nevertheless, it is reported that the number of methylene units able to give a mesophase in rigid polymers as polyesters or poly (ester imide)s in very ctitical and, sometimes, the mesophase starts to appear only for n above 6.…”

Section: H H Hhmentioning

confidence: 99%

New Poly(ether-alkyl)hydrazides: Synthesis and Characterization

Laurienzo¹,

Malinconico²,

Martuscelli³

et al. 1993

Polym J

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“…Polysemicarbazides with linear linkage -CO-NHcan be prepared from diisocyanate and dihydrazide via addition reaction [16][17][18][19] . They display widely biological activities for the application of enzymatic quasi reagents [20,21] , ureapeptoid peptidomimetics [22,23] and antibacterial Co, Cu, Ni, and Zn complexes [24,25] .…”

Section: Introductionmentioning

confidence: 99%

Photochromic azo polysemicarbazides with biocompatibility behavior

Liu

Xiong

Dong

et al. 2010

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Two kinds of azo polysemicarbazides were prepared based on 3, 3'-azobis (benzoylhydrazide) (ABH) and two kinds of diisocyanates via solution polymerization. The structures were characterized by Fourier-transform infrared (FT-IR) technique and elemental analysis. Inherent viscosities of the polymers were 0.32 and 0.29 dL/g and both could be dissolved in H 2 SO 4 and polar organic solvents. Thermal gravimetric analysis (TGA) presented a multi-step degradation and a decomposition temperature range of 230-280 ℃. And photoisomerization of the azo polymers in solvent of N, N-dimethyl acetamide (DMAc) was confirmed by Ultraviolet-visible spectroscopy (UV-Vis), suggested the isomerization appearing under the ultraviolet irradiation at 365 nm and recovering completely by visible light irradiation or kept in the dark. Transmission electron microscopy (TEM) of polysemicarbazides before and after soaking in bovine serum albumin (BSA) solution confirmed the biocompatibility of azo polymers.

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Condensation polymers from diisocyanates with dihydrazides and hydrazine

Cited by 32 publications

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Synthesis and characterization of novel polyurethanes based on N¹,N⁴‐bis[(4‐hydroxyphenyl)methylene]succinohydrazide hard segment

Synthesis and characterization of novel polyurethanes based on N¹,N⁴‐bis[(4‐hydroxyphenyl)methylene]succinohydrazide hard segment

New Poly(ether-alkyl)hydrazides: Synthesis and Characterization

Photochromic azo polysemicarbazides with biocompatibility behavior

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Condensation polymers from diisocyanates with dihydrazides and hydrazine

Cited by 32 publications

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Synthesis and characterization of novel polyurethanes based on N1,N4‐bis[(4‐hydroxyphenyl)methylene]succinohydrazide hard segment

Synthesis and characterization of novel polyurethanes based on N1,N4‐bis[(4‐hydroxyphenyl)methylene]succinohydrazide hard segment

New Poly(ether-alkyl)hydrazides: Synthesis and Characterization

Photochromic azo polysemicarbazides with biocompatibility behavior

Contact Info

Product

Resources

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Synthesis and characterization of novel polyurethanes based on N¹,N⁴‐bis[(4‐hydroxyphenyl)methylene]succinohydrazide hard segment

Synthesis and characterization of novel polyurethanes based on N¹,N⁴‐bis[(4‐hydroxyphenyl)methylene]succinohydrazide hard segment