Structure‐property relationship in polyurethane elastomers containing starch as a crosslinker

Desai, Sonal; Thakore, I. M.; Sarawade, B. D.; Devi, Surekha

doi:10.1002/pen.11247

Cited by 53 publications

(31 citation statements)

References 32 publications

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“…The morphology of polyurethane (PU) depends on the state of the compatibility and phase behavior between hard and soft segments [37]. The ESEM morphology of LPU, LPUSi and LPUSiT films is shown in Figure 4.…”

Section: Morphology Analysismentioning

confidence: 99%

Phase behavior, interaction and properties of acetic acid lignin-containing polyurethane films coupled with aminopropyltriethoxy silane

Wang¹,

Mou²,

Ni³

et al. 2013

Express Polym. Lett.

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Abstract.A series of novel acetic acid lignin-containing polyurethane (LPU) films coupled with aminopropyltriethoxy silane (APTS) (LPUSi) or the mixture of APTS and trimethylol propane (TMP) (LPUSiT) were prepared. With 2% APTS addition, the crosslinking density increased, and the resultant films were endowed with good mechanical properties and water resistance. It was also found that the hydrogen bonding interaction between -NH and -C=O of urethane was destroyed, and new hydrogen bonds between APTS and LPU were formed. However, when APTS content was greater than 4%, significant phase aggregation were detected, resulting in poor mechanical properties and water resistance. In contrast, the crosslinking density, tensile strength and water resistance can be further improved with TMP addition at 2% APTS. The simultaneous addition of APTS and TMP was beneficial for phase mixing and the formation of uniform network. And the surface morphology of LPUSiT films became smoother and more homogeneous.

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Section: Morphology Analysismentioning

confidence: 99%

Phase behavior, interaction and properties of acetic acid lignin-containing polyurethane films coupled with aminopropyltriethoxy silane

Wang¹,

Mou²,

Ni³

et al. 2013

Express Polym. Lett.

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“…16 Biodegradable PUs containing starch have been synthesized and characterized in our laboratory. 17 The sorption kinetics of various PUs has also been studied by us in the past. 18 As a further development, we synthesized biodegradable PUs using a series of carbohydrate like glucose (monosachharide), sucrose (disachharide), and starch (polysachharide) as crosslinkers by varying the NCO : OH and diol : triol ratios.…”

Section: Introductionmentioning

confidence: 99%

Sorption behavior of biodegradable polyurethanes with carbohydrate crosslinkers

Lalwani

Desai

2009

J of Applied Polymer Sci

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Polyether-polyurethanes (PUs) with a series of carbohydrate crosslinkers: monosaccharide (glucose), disaccharide (fructose) and polysaccharide (starch), were synthesized. The kinetics of swelling was studied in industrially important solvents like toluene, xylene and chlorobenzene. The R value and diol / triol ratio were varied to study the effect on crosslink density and sorption. It was observed that the swelling extent increased with increasing concentration of crosslinker in the polymer. Interestingly the effect of diisocyanate concentration on extent of sorption varied with the type of carbohydrate used for crosslinking. Considering the effect of diisocyanate concentration, the PUs containing disaccharide sucrose showed greater solvent uptake. Though the sorption behaviours were different, the solubility parameters of all PUs were the same irrespective of the type and concentration of the crosslinkers. All the PUs were observed to be biodegradable with glucose containing PUs exhibiting highest weight loss. Scanning electron microscope revealed absence of phase segregation in all the PU systems.

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“…Se han realizado modificaciones en la estructura de los segmentos de los poliuretanos para mejorar la degradación. Se ha evaluado la incorporación de componentes naturales a la matriz de poliuretano tales como colágeno, elastina entre otros para la obtención de biomateriales Estas investigaciones se han centrado principalmente en la comprensión de los efectos de los cambios estructurales en las propiedades físicas, sin embargo, el efecto sobre la degradación invitro de los poliuretanos ha sido poco investigado [4][5][6][7][8] .…”

Section: Introductionunclassified

Degradación In-Vitro de Mezclas de Poliuretano Termoplástico Y Almidón Modificado

Valero¹

2013

Polímeros

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Resumen: La estructura química del almidón de yuca se modificó mediante una reacción de acilación. El almidón de yuca modificado se mezcló con un prepolímero de uretano obtenido a partir de aceite de ricino modificado por transesterificación (MCO) y diisocianato de isoforona (IPDI) con el fin de preparar mezclas de almidón-poliuretano termoplástico. Los poliuretanos fueron expuestos a degradación in-vitro durante un período de 365 días y se evaluó la pérdida de masa y el cambio de las propiedades mecánicas y térmicas. El objetivo de este estudio fue examinar el efecto de la incorporación de almidón modificado por acilación en el poliuretano sobre las propiedades mecánicas, térmicas y la velocidad de degradación. Palabras Clave: Almidón modificado, degradación in-vitro, relación estructura-propiedades. In-vitro Degradation of Thermplastic Polyurethane and Starch ModifiedAbstract: The chemical structure of the cassava starch was modified by acylation. Cassava starch modified was mixed with urethane prepolymer based on castor oil modified by transesterification (MCO) and isophorone diisocyanate (IPDI) in order to prepare starch-blended thermoplastic polyurethanes. Polyurethanes were exposed to in-vitro degradation then monitored for changes in mass and mechanical and thermal properties over a period of 365 days. The effect of starch modified content on the thermal and physical properties of the resulting materials was detailed investigated by dynamic mechanical thermal analysis (DMTA) and measurements of mechanical properties. The aim of this study was to examine the effect of introducing starch modified into the polyurethane on the properties and in-vitro degradation.

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Structure‐property relationship in polyurethane elastomers containing starch as a crosslinker

Cited by 53 publications

References 32 publications

Phase behavior, interaction and properties of acetic acid lignin-containing polyurethane films coupled with aminopropyltriethoxy silane

Phase behavior, interaction and properties of acetic acid lignin-containing polyurethane films coupled with aminopropyltriethoxy silane

Sorption behavior of biodegradable polyurethanes with carbohydrate crosslinkers

Degradación In-Vitro de Mezclas de Poliuretano Termoplástico Y Almidón Modificado

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