Segmented polyurethane elastomers by nonisocyanate route

Nanclares, Juliana; Petrovìć, Zoran S.; Javni, Ivan; Ionescu, Mihail; Jaramillo, Franklin

doi:10.1002/app.42492

Cited by 58 publications

(45 citation statements)

References 25 publications

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“…The observed increase in tensile strength also caused the phase separation between the hard and soft segments of the matrix, [37] which is stimulated by the presence of nanofiller. It was found that the TS B values for the composites containing 1 and 2 wt.% of GNP were higher or equal to that of the reference material.…”

Section: Evaluation Of Mechanical Propertiesmentioning

confidence: 99%

Elastic polyurethane foams containing graphene nanoplatelets

2017

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Elastic polyurethane foams were produced from two-component polyurethane systems (SPECFLEX NE 113 izocyjanian/NR 816 poliol system-SPC and ElasticMBMarket company system POLYOL ET MB 500/ISO ET MB 800-ET) by using a one-step method. The foams were a graphene nanoplatelets (GNP) in the amount ranging from 1 to 2 wt.%. The effect of the nanofiller on polyurethane matrix was determined by analyzing the chemical structure, static and dynamic mechanical properties, and thermal stability of reinforced foams. The application of the carbon nanofiller resulted in increased density and hardness of the obtained composites. The addition of the nanofiller caused a shift in glass transition temperature toward lower temperature values, and an increase in the Young's modulus, but did not significantly affected the thermal stability of the obtained composites. The research results showed that graphene nanoplatelets nanofiller can be successfully used as a modifier of mechanical and thermal properties in elastic polyurethane foams. K E Y W O R D Sfoams, nanocomposites, polyurethanes, thermal properties

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Section: Evaluation Of Mechanical Propertiesmentioning

confidence: 99%

Elastic polyurethane foams containing graphene nanoplatelets

2017

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“…9). Generally, an increase in tensile strength also resulted from phase separation (Nanclares et al 2015) between the soft and hard segments of the matrix which is favored by the presence of MCC. It was observed that for the higher MCC contents the differences between the TS b values were insignificant, i.e.…”

Section: Scanning Electron Microscopymentioning

confidence: 99%

Bio polyetherurethane composites with high content of natural ingredients: hydroxylated soybean oil based polyol, bio glycol and microcrystalline cellulose

Głowińska

Datta

2015

Cellulose

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In our study, we focused on obtaining biopolyurethane composites using bio-components such as bio glycol, modified natural oil-based polyol, and microcrystalline cellulose (MCC). The pre-polymer method was used to prepare the bio polyurethane matrix. Prepolymer was synthesized using 4,4 0 -diphenylmethane diisocyanate and a polyol mixture containing 50 wt% of commercial polyether and 50 wt% of hydroxylated soybean oil (H3). Bio based 1,3-propanediol (1,3bioPDO) was used as the prepolymer chain extender. The composites were produced by dispersing 5, 10, 15 and 20 wt% of MCC in the bio polyurethane matrix. The polymerization was catalyzed with 1,4-diazabicyclo[2.2.2]octane. The influence of the added MCC powder on the structure and thermal properties of the obtained composites was investigated. The FTIR analysis demonstrated that the MCC admixture affected the absorbance of C-O-C and C=O groups and the phase separation index of the obtained bio-polyurethanes composites. The results of mechanical tests and scanning microscopy images indicated good interfacial adhesion between the partially bio-based matrix of the composite and bio-filler. The results of thermomechanical analysis showed that the application of MCC as a filler has a positive effect on the storage and loss modulus of the composites.

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“…While extensive research has been done on PHU synthesis, relatively little work has focused on nanophase-separated PHUs as thermoplastic elastomer [53,54]. Only one study has contributed to understanding the role of hydroxyl groups in modifying the properties of thermoplastic PHU elastomer in comparison to analogous, isocyanate-based thermoplastic PU elastomers (TPUs) [54].…”

Section: Introductionmentioning

confidence: 99%

Novel thermoplastic polyhydroxyurethane elastomers as effective damping materials over broad temperature ranges

Beniah

Liu

Heath

et al. 2016

European Polymer Journal

101

111

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a b s t r a c tNon-isocyanate thermoplastic polyhydroxyurethane (PHU) elastomers were synthesized from cyclic carbonate aminolysis using polytetramethylene oxide (PTMO) as soft segment and divinylbenzene dicyclocarbonate and three diamine chain extenders as hard segment with a range of hard-segment content. Characterization was done via Fourier transform infrared spectroscopy, small-angle X-ray scattering (SAXS), uniaxial tensile testing, and dynamic mechanical analysis (DMA). SAXS reveals that these PHUs possess nanophaseseparated morphology with 10-20 nm interdomain spacings. These PHUs display elastomeric response and tunable tensile properties with Young's modulus ranging from 27 to 200 MPa, tensile strength from 0.3 to 9.7 MPa and elongation at break ranging up to greater than 2000%. DMA reveals that nanophase separation in these PHUs is accompanied by broad interphases having a wide range of local composition; this nanophase separation differs significantly from that manifested by thermoplastic polyurethane elastomer (TPU) due to hydrogen bonding of hydroxyl groups in the hard segments to the PTMO soft segment. These PHUs show very good damping performance with tan d P 0.30 over broad temperature ranges (P60°C), which are tunable through simple variation of hardsegment content and chain extender structures.

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Segmented polyurethane elastomers by nonisocyanate route

Cited by 58 publications

References 25 publications

Elastic polyurethane foams containing graphene nanoplatelets

Elastic polyurethane foams containing graphene nanoplatelets

Bio polyetherurethane composites with high content of natural ingredients: hydroxylated soybean oil based polyol, bio glycol and microcrystalline cellulose

Novel thermoplastic polyhydroxyurethane elastomers as effective damping materials over broad temperature ranges

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