Wood based PLA and PP composites: Effect of fibre type and matrix polymer on fibre morphology, dispersion and composite properties

Peltola, Heidi; Pääkkönen, Elina; Jetsu, Petri; Heinemann, Sabine

doi:10.1016/j.compositesa.2014.02.002

Cited by 138 publications

(132 citation statements)

References 16 publications

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“…Assuming that both the fiber length and the interfacial adhesion were at a sufficient level, it is possible that a reinforcing effect would be achieved by further increasing the fiber content to 30 to 40 wt.% (Migneault et al 2009;Peltola et al 2014). Peltola et al (2014) reported a notable increase in tensile strength (77 MPa vs. 61.5 MPa for neat PLA) for 30 wt.% H2O2-bleached TMP with an average length of 0.43 mm. According to Koljonen et al (2003), peroxide bleaching has only a very limited influence on the surface lignin of TMP fibers.…”

Section: Mechanical Properties and Fracture Mechanismmentioning

confidence: 99%

“…It is well known that extrusion causes damage to natural fibers (Le Baillif and Oksman 2009;Peltola et al 2014). Thus, optical analysis was carried out with a commercial Kajaani FiberLab (Metso Automation, Finland) device, yielding information on the fiber length and width distributions before and after melt compounding (Table 1, Fig.…”

Section: Characterization Of Fiber Morphologymentioning

confidence: 99%

“…To the best of our knowledge, this is the first study to cover the thermal, mechanical, and water absorption properties of meltcompounded injection molded HT-TMP/PLA composites. Previous studies, such as those of Peltola et al (2011Peltola et al ( , 2014, have described the use of conventional TMP and other woodderived fibers.…”

Section: Introductionmentioning

confidence: 99%

“…The weak interfiber bonding that is characteristic of these HT-TMPs (Roffael et al 2001;Widsten et al 2001Widsten et al , 2004Gustafsson et al 2003) is considered a drawback in papermaking, where a strong fiber network is desired, but it may even be an advantage in composite applications, where uneven fiber dispersion in the matrix is a common obstacle. It has also been proposed that the abundance of lignin in TMPs enhances their adhesion to hydrophobic matrices (Peltola et al 2014;Solala et al 2014).…”

Section: Introductionmentioning

confidence: 99%

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Composites of High-Temperature Thermomechanical Pulps and Polylactic Acid

Solala¹,

Koistinen²,

Siljander³

et al. 2015

BioResources

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a High-temperature thermomechanical pulps (HT-TMP, defibrated at 150 to 170 °C) were compared to a reference TMP (defibrated at 130 °C) as a reinforcement for polylactic acid (PLA). Composites were prepared by melt compounding, followed by injection molding, gradually increasing the used fiber content from 0 to 20 wt.%. The injection-molded specimens were characterized by tensile and impact strength tests, scanning electron microscopy, water absorption tests, and differential scanning calorimetry. The TMP fiber damage was also characterized before and after melt compounding by optical analysis. At 20% fiber content, the Young's modulus increased significantly, while the tensile strength remained unchanged and the impact strength decreased slightly. All fibers suffered damage during melt compounding, but the tensile strength remained about the same as in pure PLA. All types of TMP were able to increase the PLA rate of crystallization. The HT-TMP fibers were dispersed more evenly in PLA than the 130 °C TMP. The 170 °C TMP produced composites of lower water absorption than the other two TMP types, probably because of its lower hemicellulose content and its higher surface coverage by lignin.

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Section: Mechanical Properties and Fracture Mechanismmentioning

confidence: 99%

Section: Characterization Of Fiber Morphologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Composites of High-Temperature Thermomechanical Pulps and Polylactic Acid

Solala¹,

Koistinen²,

Siljander³

et al. 2015

BioResources

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“…In most cases, positive relationship between the wood flour content and moisture absorption is observed [6], but a correlation between moisture content and fiber dispersion can also be found [27]. It has been suggested, that water can be transferred into a composite by means of diffusion through microvoids in the polymeric phase or through spaces on the interface between the filler and the matrix, which could act as capillaries [6,27,28]. An increase in water absorption can be observed even if the fibers are not highly hydrophilic [28].…”

Section: Water Absorptionmentioning

confidence: 99%

Influence of Water on Tribological Properties of Wood-Polymer Composites

Mysiukiewicz

Sterzyński

2017

Archives of Mechanical Technology and Materials

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A B S T R A C TUtilization of ecological materials for appliances and products is one of the ways to achieve the goal of sustainability. Wood-polymer composites as a cheap, lightweight, durable and esthetic material has gained attention of scientists, engineers and consumers alike. Different kinds of polymeric matrices, plants used as the fillers, chemical of physical modifiers and processing technologies have already been widely studied. Nonetheless, surprisingly few information on WoodPolymer Composites' tribology can be found. This paper is an attempt to fill this gap. Polypropylene-and poly(lactic acid)-based composites with varying wood flour content have been analyzed. The Brinell's hardness and coefficient of friction of the samples have been determined. In order to evaluate the influence of the moisture content on the tribological and mechanical properties of the composites, the samples have also been aged in water. The investigation revealed that polymeric composites filled with wood flour can present favorable coefficient of friction, compared to the neat resins. The results of our study can establish a good starting point for further investigation. K E Y W O R D SWood-Polymer Composites tribology, hardness water uptake

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