A mathematical model of rheological behavior of novel bio-based isocyanate-terminated polyurethane prepolymers

Głowińska, Ewa; Datta, Janusz

doi:10.1016/j.indcrop.2014.06.016

Cited by 36 publications

(29 citation statements)

References 14 publications

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“…The molecules passing in the flow field change their direction by rotation, to become parallel to the flow direction. This configuration results in lower frictional resistance as well as lower viscosity . In relation to the changes observed, it can be concluded that the glycerolysates, under shear rate, are not resistant to shear under given conditions .…”

Section: Results and Disscusionmentioning

confidence: 76%

Single‐phase product obtained via crude glycerine depolymerisation of polyurethane elastomer: structure characterisation and rheological behaviour

Kopczyńska

Datta

2016

Polymer International

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Section: Results and Disscusionmentioning

confidence: 76%

Single‐phase product obtained via crude glycerine depolymerisation of polyurethane elastomer: structure characterisation and rheological behaviour

Kopczyńska

Datta

2016

Polymer International

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“…The viscosity in such liquids decreases as the shear rate increases, initially rapidly, then slower, until the optimal arrangement of particles is achieved. Reducing the viscosity of pseudoplastic fluids under the influence of increased shear rate is also the reason for their determination as so-called shear-thinning liquids (Głowińska and Datta 2014).…”

Section: Resultsmentioning

confidence: 99%

Chemical structures, rheological and physical properties of biopolyols prepared via solvothermal liquefaction of Enteromorpha and Zostera marina biomass

et al. 2019

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In this work, liquefied biomass from the Baltic Sea was used for the preparation of rigid polyurethane (PUR) foams. The biomass contained 10 wt% of Enteromorpha macroalgae and 90 wt% of Zostera marina seagrass characterized by a high content of cellulose. The influence of time, temperature and the type of solvent on the efficiency of the liquefaction process and properties of biopolyols was determined. Obtained materials were analyzed in terms of chemical structure, rheological properties, thermal stability and basic physical and mechanical properties. It was found that optimal parameters for liquefaction of used biomass were: temperature of 150°C, reaction time of 6 h and a solvent mixture containing glycerol and poly(ethylene glycol) in ratio of 50:50 (biopolyol 50G50P_150). Under these conditions, 78 wt% of biomass was liquefied and resulting biopolyol was characterized by a hydroxyl number of 650 mg KOH/g. Depending on the used solvent mixture and the liquefaction temperature, biopolyols showed the character of Newtonian or non-Newtonian liquids. Rigid PUR foams were obtained by substitution of petrochemical polyol with 10, 20 and 30 wt% of biopolyol. It was found that the addition of biopolyol to foams' formulations did not cause significant changes in their chemical structure, while mechanical strength and thermal stability were enhanced. The presented study confirms that biomass from the Baltic Sea can be used for the synthesis of biopolyols and rigid polyurethane foams.

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“…The content of hard segments in bio polyurethane matrix was calculated as about 39 %. The scheme of bio-polyurethane synthesis via prepolymer method was described in our previous papers Głowińska and Datta 2014).…”

Section: Methodsmentioning

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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A mathematical model of rheological behavior of novel bio-based isocyanate-terminated polyurethane prepolymers

Cited by 36 publications

References 14 publications

Single‐phase product obtained via crude glycerine depolymerisation of polyurethane elastomer: structure characterisation and rheological behaviour

Single‐phase product obtained via crude glycerine depolymerisation of polyurethane elastomer: structure characterisation and rheological behaviour

Chemical structures, rheological and physical properties of biopolyols prepared via solvothermal liquefaction of Enteromorpha and Zostera marina biomass

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

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