Phase Behaviors of PU/SPI Green Composites Using SAXS Profiles

Madhukar, B. S.; Gowda, D. G. Bhadre; Annadurai, V.; Somashekar, R.; Siddaramaiah,

doi:10.1002/adv.21526

Cited by 5 publications

(9 citation statements)

References 37 publications

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“…Compared to ester bonds, the absorption peaks of the urethane linkages overlapped at 1,724 cm −1 , 1,526 cm −1 , and 1,172 cm −1 , and resulted in unclear assignment of the three peaks for S50P50 and S45P45PUP10 samples. Further, comparing with the peak at 1,526 cm −1 for PUP, the peak at 1,526 cm −1 for S45P45PUP10 became stronger and wider, suggesting the existence of new urethane linkages . The new urethane linkages were formed from the reaction of the OH or NH groups of SPI and the NCO groups of PUP, which was in agreement with the results obtained by Chen et al and Deng et al .…”

Section: Resultssupporting

confidence: 91%

Properties of Compatible Soy Protein Isolate/Polycaprolactone Composite with Special Interface Structure

Liu

et al. 2017

Polymer Composites

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It is important to improve the compatibility and ultimately the properties of biobased polymer materials as alternative materials for non-degradable polymer materials. In this study, polyurethane prepolymer (PUP) was synthesized from PCL diols, and the PUP with special structure was used as a compatibilizer to improve the compatibility between hydrophilic soy protein isolate (SPI) and hydrophobic PCL composites. The structure and properties of the soy protein isolatepolycaprolactone (SPI-PCL) composites were investigated. The results showed that the mechanical properties such as the tensile strength, impact strength, and bending strength of the modified composites were increased as compared to un-modified composites, respectively. Also, the SEM results showed that the interfacial adhesion between the hydrophobic PCL and hydrophilic SPI was also enhanced because of the existence of compatible PU interfacial layer in the composites. Clearly, the strong urethane linkage interaction between the PU interfacial layer and the SPI particles, and the PCL-PCL crystallinity interactions between the PU interfacial layer and PCL matrix were responsible for the improved compatibility in the SPI-PCL composites. Therefore, the addition of the PUP with the special structure improved the compatibility and the properties of the SPI-PCL composites significantly. POLYM. COMPOS., 00:000-000,

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Section: Resultssupporting

confidence: 91%

Properties of Compatible Soy Protein Isolate/Polycaprolactone Composite with Special Interface Structure

Liu

et al. 2017

Polymer Composites

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“…[7] Furthermore, using a bio-based and/ or biodegradable polymer as the material matrix can additionally increase the green credentials of the WPCs. [8,9] Green composites are a specific class of WPCs, in which the matrix is a biopolymer. [10] In this regard, the use of NFs such as jute, sisal, flax, hemp, and bamboo fibers on biopolymers has been recently intensified.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of compression‐molded green composite sheets made of poly(3‐hydroxybutyrate) reinforced with long pita fibers

et al. 2016

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Novel green composites were successfully prepared from bacterial poly(3hydroxybutyrate) (PHB) and pita fibers derived from the agave plant (Agave americana). Various weight contents (10, 20, 30, and 40 wt.-%) of pita fibers at different lengths (5, 15, and 20 mm) were successfully incorporated into PHB by compression molding. The newly prepared PHB/pita fibers composite sheets were characterized in terms of their mechanical and thermomechanical properties and then related to their morphology after fracture. Attained results indicated that the mechanical stiffness of PHB significantly improved with both the content and length of pita fibers, although ductile properties were reduced. In particular, the elastic modulus of the 40 wt.-% PHB composite sheets containing 20-mm-long pita fibers was approximately 55% higher than the unfilled PHB sheet. Shore D hardness also improved, achieving the shortest pita fibers the highest improvement. Pita fibers with lengths of 15 and 20 mm also increased the Vicat softening point and heat deflection temperature (HDT) by 38 and 21°C, respectively. Due to their optimal shape, it is concluded that pita fibers with lengths above 15 mm can potentially reinforce and improve the performance of PHB biopolymer. In addition, the compression-molding methodology described in this research work represents a cost-effective pathway to feasibly prepare long-fiberreinforced thermoplastics (LFRTs) fully based on renewable raw materials. Resultant green composite sheets can be of interest for the development of sustainable parts in the automotive industry and other advanced applications in polymer technology. K E Y W O R D S automotive parts, compression molding, green composites, pita fibers, polyhydroxyalkanoates F I G U R E 6 Thermomechanical properties of the poly(3-hydroxybutyrate) (PHB) composite sheets as function of the pita fiber content in weight (wt.-%) at different lengths in terms of (a) Vicat softening point; (b) heat deflection temperature (HDT)

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“…The DSC thermograms indicate that as the SPI content increases the T g of the green composites are slightly increases up to 8 wt% of SPI filler loading. The improvement in T g values of the PU/SPI green composites can be ascribed to (i) the dispersed SPI filler in PU matrix, which restrict the free motion of the polymer chains, and (ii) there is strong hydrogen bonding between –OH groups of SPI and urethane groups of PUs, which can also retard the motion of polymer chains …”

Section: Resultsmentioning

confidence: 99%

“…TGA thermograms are recorded for SPI, PU and their composites under nitrogen gas purge to investigate the thermal stability and thermal degradation behaviors . TGA thermogram of SPI (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…TGA thermograms are recorded for SPI, PU and their composites under nitrogen gas purge to investigate the thermal stability and thermal degradation behaviors. 24 TGA thermogram of SPI (Fig. 4f) indicates that 3-4% weight loss takes place around 100°C, 4-5% weight loss takes place around 200°C, 20-21% weight loss takes place around 300°C, 51-52% weight loss takes place around 400°C, 59-60% weight loss takes place around 500°C, 67-68% weight loss takes place around 600°C, and around 94-95% weight loss takes place around 800°C.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

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Polyurethane/Soya Protein Isolate Green Composites: Spectral, Microstructural, Thermal, Swelling, and Biodegradation Behaviors

et al. 2016

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A series of polyurethane (PU) green composites were synthesized with varying amounts, viz. 0, 2, 4, 8, and 12 wt% of soya protein isolate (SPI). Formation of the urethane linkage in the prepared green composites is revealed by infrared spectroscopy. The glass transition temperature (T g ) of the fabricated PU/SPI composites has been evaluated by differential scanning calorimeter. Thermal stability and degradation analysis of the PU/SPI composites have been performed using a thermogravimetric analyzer (TGA). TGA thermograms clearly revealed that the fabricated composites were thermally stable upto 181°C and show a three-step of thermal degradation. The water uptake behaviors of PU/SPI systems have been studied at different chemical environments such as distilled water, salt solution, acidic and alkaline solutions. The microcrystalline parameters such as crystallite size ( N ) and surface weighted crystal size (D s ) have been evaluated from wide-angle X-ray scattering profiles using two different asymmetric distribution functions. PU/SPI green composites were subjected to biodegradation in the presence of Aspergillus niger. The structure-property response of the PU/SPI green composites has been established on the basis of these parameters. C 2016 Wiley Periodicals, Inc. Adv Polym Technol 201 , , 21679; View this article online at wileyonlinelibrary.com.

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Phase Behaviors of PU/SPI Green Composites Using SAXS Profiles

Cited by 5 publications

References 37 publications

Properties of Compatible Soy Protein Isolate/Polycaprolactone Composite with Special Interface Structure

Properties of Compatible Soy Protein Isolate/Polycaprolactone Composite with Special Interface Structure

Preparation and characterization of compression‐molded green composite sheets made of poly(3‐hydroxybutyrate) reinforced with long pita fibers

Polyurethane/Soya Protein Isolate Green Composites: Spectral, Microstructural, Thermal, Swelling, and Biodegradation Behaviors

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