Reinforcement of biodegradable poly(ester-urethane) with fillers

Hiljanen-Vainio, M.; Heino, M.; Seppälä, Jukka

doi:10.1016/s0032-3861(97)00345-5

Cited by 39 publications

(25 citation statements)

References 3 publications

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“…In the conventional microcomposites the addition of fibers improves the modulus. Besides, higher strength can also be observed in systems with good interfacial interactions, while deformation at break decreases significantly [8,[20][21][22]. In general, the reason for the failure of microcomposites at low strains is the initiation of the failure by interfacial debonding at multiple sites, which is followed by the coalescence of the cracks and final catastrophic crack growth [9,23,24].…”

Section: Mechanical Properties and Mathematical Validationmentioning

confidence: 99%

High‐strength composites based on tung oil polyurethane and wood flour: Effect of the filler concentration on the mechanical properties

Casado

Marcovich

Aranguren

et al. 2009

Polymer Engineering & Sci

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New composite materials with a high percentage of their composition based on renewable resources, matrix and reinforcement, were prepared. The excellent compatibility of the main phases lead to an unusual outstanding composite behavior as follows: higher modulus and strength, but also higher deformability and fracture resistance than the neat polymer. A bio‐based polyol was obtained by chemical modification of tung oil to be used in the production of polyurethane composites reinforced with pine wood flour (WF). The mechanical behavior as a function of wood flour content was evaluated through tensile and impact tests. Increasing the filler content induced an increase in tensile modulus and strength as well as in impact strength. Composites containing 10 and 15 wt% of wood flour presented higher tensile ultimate strain than that of the unfilled polyurethane. These results were explained by a strong interfacial adhesion (physical and chemical bonding), which was also supported by SEM micrography and strength modeling. POLYM. ENG. SCI., 2009. © 2009 Society of Plastics Engineers

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Section: Mechanical Properties and Mathematical Validationmentioning

confidence: 99%

High‐strength composites based on tung oil polyurethane and wood flour: Effect of the filler concentration on the mechanical properties

Casado

Marcovich

Aranguren

et al. 2009

Polymer Engineering & Sci

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“…It has been previously reported that the tensile strength of filled polymers may increase or decrease with increased filler content. 10,11,13,15,17,23 Figure 1 shows that the tensile strength provided by talc increases with increasing filler content, whereas that provided by wollastonite and gypsum decreases once the filler content reaches a certain amount. In the gypsum case, the reduction in strength may be caused by agglomeration of gypsum particles, which increases at high filler loadings.…”

Section: Tensile and Flexural Propertiesmentioning

confidence: 99%

“…Still other researchers noted that mechanical properties are independent of particle size. [15][16][17] Fillers are often coated with coupling agents to enhance chemical bonding between filler particles and the polymer matrix. The selection of an appropriate coupling agent involves identification of a suitable group of agents that is compatible with the targeted polymers.…”

Section: Introductionmentioning

confidence: 99%

Mineral filler reinforcement for commingled recycled‐plastic materials

Putra

Ngothai

Ozbakkaloglu

et al. 2009

J of Applied Polymer Sci

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Three types of mineral fillers, gypsum, wollastonite, and talc, were investigated for their ability to modify the mechanical properties of commingled recycled-plastic composites containing 0.07-0.26 v/v of filler. Mechanical test results showed that the talc reinforced composites were significantly better in mechanical properties when compared with the gypsum and wollastonite composites. Scanning electron microscopy (SEM) showed that gypsum formed large agglomerates in the matrix. Interfacial adhesion between filler and matrix was evaluated using simple empirical models. To enhance the adhesion, talc, and wollastonite were pretreated with silane coupling agents, 3-methacryloxypropyltrimethoxy silane (c-MPS) and 3-aminopropyltriethoxy silane (c-APS). This did not result in any significant improvement to the material properties. The c-APS treatment, however, increased the tensile properties of the composites by $ 5% when compared with the c-MPS treatment. The SEM investigations showed that the c-APS treatment provided better adhesion of filler particles and hence voids were less likely to form in the matrix when compared with the c-MPS composites.

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“…[1][2][3][4][5] Fillers can be used to improve modulus, impact strength, and thermal resistance; to control the color; to improve biodegradability; and to decrease the cost of the product. 6 Both inorganic (e.g., glass, CaCO 3 , talc, mica) and organic (e.g., wood flour, jute, flax, etc.)…”

Section: Introductionmentioning

confidence: 99%

Filamentous green algae additions to isocyanate based foams

Johnson

Shivkumar

2004

J of Applied Polymer Sci

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ABSTRACT:Filamentous green algae, Cladophora glomerata, obtained from rivers and streams in California was used as a filler in isocyanate-based foams. Up to 40 wt % dried and chopped algal fibers were added to the isocyanate-polyol mix. The algal fibers and foam samples were examined by scanning electron microscopy. The effective hydroxyl number of the algae and the tensile and compressive properties of the composite foam were measured. The results indicate that foams with a uniform cell size were obtained for algal fiber lengths between 500 and 600 m. Peak mechanical properties were obtained for algae concentrations between 5 and 10 wt %. The elastic modulus of the foam follows a power law relationship with density, with an exponent of 1.6. The overall hydroxyl number for the algae is around 300. The hydroxyl groups in the algae can serve as efficient sites for reactions with isocyanate and hence algae fibers can act as reinforcing fillers.

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Reinforcement of biodegradable poly(ester-urethane) with fillers

Cited by 39 publications

References 3 publications

High‐strength composites based on tung oil polyurethane and wood flour: Effect of the filler concentration on the mechanical properties

High‐strength composites based on tung oil polyurethane and wood flour: Effect of the filler concentration on the mechanical properties

Mineral filler reinforcement for commingled recycled‐plastic materials

Filamentous green algae additions to isocyanate based foams

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