The mechanism of reinforcement of polyurethane foam by high-modulus chopped fibres

Cotgreave, T.; Shortall, J. B.

doi:10.1007/bf00548161

Cited by 46 publications

(23 citation statements)

References 11 publications

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“…31 However, due to the agglomeration of llers during processing, these composites oen show a poor exibility at high llers concentrations. In the study by Cotgreave et al, 27 a similar elongation decrease in the composites of PU/high-modulus chopped bres was noticed. In the study by Cotgreave et al, 27 a similar elongation decrease in the composites of PU/high-modulus chopped bres was noticed.…”

Section: Introductionsupporting

confidence: 62%

Largely reinforced polyurethane via simultaneous incorporation of poly(lactic acid) and multiwalled carbon nanotubes

et al. 2015

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In this study, we simultaneously introduced both poly(lactic acid) (PLA) and multiwalled carbon nanotubes (CNTs) into the polyurethane (PU) matrix via melt blending, to achieve balanced mechanical properties and good conductivity. Different contents of PLA (0-30 wt%) and CNTs (0-3.0 wt%) were used in this work. A significant improvement in tensile strength at 300% strain and Young's modulus were observed, which could not be obtained by incorporating either PLA or CNTs with PU separately. Particularly, the ternary composites containing a large amount of PLA (30 wt%), 70PU/30PLA/CNTs composites, exhibit superior mechanical properties compared to other composites with less PLA content but the same amounts of CNTs. Moreover, the ternary composites showed better electrical conductivity compared with the binary counterpart. SEM observations demonstrated that PLA particles and CNTs are separately dispersed in the PU matrix. It was found that PLA particles remain spherical and their size increases with increasing PLA content up to 30 wt%, while a network structure of CNTs is formed with increasing its content, which was also confirmed via dynamic rheological analysis. Interestingly, some CNTs were seen to be located in the interfaces between PLA particles and the PU matrix for 70PU/30PLA/CNTs composites, namely, some CNTs exhibit a nano-bridge effect between PU and PLA. We hypothesized that the nano-bridge structure of CNTs in the composites could mainly contribute to the observed enhancement of mechanical properties and electrical conductivity.

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Section: Introductionsupporting

confidence: 62%

Largely reinforced polyurethane via simultaneous incorporation of poly(lactic acid) and multiwalled carbon nanotubes

et al. 2015

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“…In the last years, several studies have reported the results of cellular materials reinforced or filled with different types of fibers, which lead to changes in the polymer matrix behavior, such as the heat released during the polymerization reaction, the stiffness of the foams, the capacity of energy absorption, and their density among others …”

Section: Introductionmentioning

confidence: 99%

Rapeseed oil‐based polyurethane foams modified with glycerol and cellulose micro/nanocrystals

Mosiewicki

Rojek

Michałowski

et al. 2014

J of Applied Polymer Sci

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A rapeseed oil-based polyol (ROPO) was synthesized using chemical modification of the rapeseed oil (RO) by epoxidation reaction followed by oxirane ring-opening with diethylene glycol. The ROPO was used in the formulation of low-density green polyurethane (PU) foams. The use of glycerol as hydroxyl component, water as a reactive blowing agent and micro/nanocellulose (MNC) as a reinforcement increases the content of natural components in the formulations with important effects on the final foam properties. The ROPO and their intermediate products are characterized by analytical techniques and FTIR spectroscopy, while the final PU foams are characterized by morphological and mechanical analysis. The results show that the addition of glycerol increases the modulus and yield stress. The incorporation of MNC in small amounts is enough to increase the modulus at low temperatures. Both modifiers cause an increase in water absorption and the fragility of the cell walls, reflected in the micrographs of the foams. V C 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41602.

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“…Numerous studies have reported improvements in the mechanical properties of polymer foams 79 reinforced with short fibers [9,10,11,12,13], particles [14,15,16,17,18], and nano-particles 80 [19,20,21,22], but relatively few have made use of cellular models to interpret the results of 81 mechanical tests and to develop predictive tools. Barma et al [15] related the foam stiffness (E f ) 82 to the solid stiffness (E s ) and cell size in particle-reinforced foams at the same density.…”

Section: Introduction 19mentioning

confidence: 99%

Evaluation of the anisotropic mechanical properties of reinforced polyurethane foams

Hamilton

Thomsen

Madaleno

et al. 2013

Composites Science and Technology

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The mechanism of reinforcement of polyurethane foam by high-modulus chopped fibres

Cited by 46 publications

References 11 publications

Largely reinforced polyurethane via simultaneous incorporation of poly(lactic acid) and multiwalled carbon nanotubes

Largely reinforced polyurethane via simultaneous incorporation of poly(lactic acid) and multiwalled carbon nanotubes

Rapeseed oil‐based polyurethane foams modified with glycerol and cellulose micro/nanocrystals

Evaluation of the anisotropic mechanical properties of reinforced polyurethane foams

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