Synthesis and characterization of poly(ether-urethane)s derived from 3,6-diisobutyl-2,5-diketopiperazine and PTMG and study of their degradability in environment

Rafiemanzelat, Fatemeh; Zonouz, Abolfazl Fathollahi; Emtiazi, Giti

doi:10.1016/j.polymdegradstab.2011.10.009

Cited by 21 publications

(14 citation statements)

References 30 publications

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“…In recent years, the interest associated with the development of biopolymers has encouraged the use of products derived from renewable sources as starting materials. Therefore, natural polymers (starch, cellulose, chitin) or natural monomers have been used as such or aer chemical transformations [1][2][3][4][5][6][7][8][9][10][11][12][13] to obtain new polymeric materials.…”

Section: Introductionmentioning

confidence: 99%

One-pot oligoamides syntheses froml-lysine andl-tartaric acid

et al. 2017

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Section: Introductionmentioning

confidence: 99%

One-pot oligoamides syntheses froml-lysine andl-tartaric acid

et al. 2017

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“…Other possibilities are the peptide bond dissociations in LAC rings and urea bonds dissociation at the connection of LAC to the polymer chains. However, it should be noted that these less hydrophilic parts of the chains are less exposed to water to take part in hydrolysis process considerably [55][56][57]. Furthermore, the LAC residue, due to its circular structure, needs to break through two bonds to afford the chain dissociation, and this would be more difficult to achieve (Scheme S4).…”

Section: Degradation Of Peus In Pbs Solutionmentioning

confidence: 99%

Synthesis and characterization of novel biodegradable water dispersed poly(ether-urethane)s and their MWCNT-AS nanocomposites functionalized with aspartic acid as dispersing agent

et al. 2018

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New biodegradable poly(ether-urethane)s (PEU)s were synthesized via the reaction of L-leucine anhydride cyclo-peptide, polyethylene glycol-1000 and hexamethylene diisocyanate. Then, they were end-functionalized with aspartic acid (AS) as a dispersing agent and were dispersed in water. MWCNTs were also functionalized by AS under microwave irradiation. Polymer/MWCNT-AS composites and polymer/MWCNT-AS water dispersed composites were prepared through an ultrasoundassisted method. We have designed these PEUs with two different structural architectures (PA1and PA2) which can be readily dispersed in water (PA1-D and PA2-D). The structure and properties of the polymers, MWCNTs-AS and PEUs/MWCNTs-AS composites were investigated by FTIR and NMR spectroscopy methods and FE-SEM, TEM and TGA techniques. The particle sizes of the resulting PA1-D and PA2-D dispersions were in the range of 200-300 nm. The results showed that by increasing MWCNT-AS loading, the degradation rate and particle sizes of the dispersed composites decreased, while thermal stability and dispersion stability of the composite systems increased. The degradation tests of polymers and their composites in PBS at 37 °C after 10 days showed weight losses ranging from 23 to 44 and 17-37%, respectively. The cytotoxicity study of polymers using the direct-contact test on L929 mouse fibroblast cell line showed no toxicity. Other properties such as thermal stability, dispersion's particle size, degradation rate and morphology of the composites were studied, and the effect of simultaneous dispersion of MWCNTs-AS and PEUs in water on the properties of the resulting mixtures was studied. We suggest that these polymers have tunable properties which may potentially be considered for drug carriers' studies.

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“…PUs generally consist of a soft segment which is formed from linear, long chain diol and hard segment built from diisocyanate and low molecular weight diol or diamine. PUs obtained from poly(tetramethylene oxide) (PTMO) are one of the most industrially important class of these materials, which are widely being studied in recent years . Moreover, among various kinds of polymer‐matrix nanocomposites, segmented PU loaded by CNT fillers could be an attractive subject.…”

Section: Introductionmentioning

confidence: 99%

Poly(tetramethylene oxide) (PTMO)‐grafted carbon nanotubes for preparing PTMO‐based polyurethane films with enhanced storage moduli

Behniafar

Haghighi‐Yazdi

2017

Adv Polym Technol

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In this article, multi-walled carbon nanotubes (CNT's) were coated by poly(tetramethylene oxide) (PTMO) soft layer. PTMO was used for preparing segmented polyurethane (PU) films as well. PTMO-grafted CNT was utilized for loading into the PTMO-based segmented PU films in three different contents, i.e., 0.2, 0.4, and 0.8 wt.%. All PU-CNT nanocomposites were characterized by field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) techniques. The resulting nanocomposites were also investigated by thermogravimetric analysis (TG/DTG), differential thermal analysis (DTA), and dynamic mechanical thermal analysis (DMTA). DTMA results showed a significant increase in the storage moduli, especially at temperatures

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Synthesis and characterization of poly(ether-urethane)s derived from 3,6-diisobutyl-2,5-diketopiperazine and PTMG and study of their degradability in environment

Cited by 21 publications

References 30 publications

One-pot oligoamides syntheses froml-lysine andl-tartaric acid

One-pot oligoamides syntheses froml-lysine andl-tartaric acid

Synthesis and characterization of novel biodegradable water dispersed poly(ether-urethane)s and their MWCNT-AS nanocomposites functionalized with aspartic acid as dispersing agent

Poly(tetramethylene oxide) (PTMO)‐grafted carbon nanotubes for preparing PTMO‐based polyurethane films with enhanced storage moduli

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