Moisture uptake and hygroexpansion of wood fiber composite materials with polylactide and polypropylene matrix materials

Almgren, Karin; Gamstedt, E. Kristofer; Berthold, Fredrik; Lindström, Mikael

doi:10.1002/pc.20753

Cited by 40 publications

(29 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…From the results, it can be concluded that the PP/hemp had higher moisture absorption compared with PLA/hemp. It could be explained by the lower interfacial compatibility between hemp fiber and PP matrix, which can result in incomplete wetting resulting in microcracks, offering channels for better moisture transport . The PLA‐PP/hemp composite showed higher moisture absorption than PLA‐hemp composite.…”

Section: Resultsmentioning

confidence: 99%

Mechanical and thermal characterization of compression moulded polylactic acid natural fiber composites reinforced with hemp and lyocell fibers

Baghaei

Skrifvars

Rissanen

et al. 2014

J of Applied Polymer Sci

View full text Add to dashboard Cite

This research evaluates the effects of PLA/PP blend ratio and Lyocell/hemp mixture ratio on the morphology, water absorption, mechanical and thermal properties of PLA‐based composites. The composites were fabricated with 30 mass % hemp using compression moulding. As a reference composites made from PP were also studied. Combining of hemp and Lyocell in PLA composite leads to the reduction of moisture absorption and can improve the impact, tensile, flexural properties when compared with PLA/hemp. Composite based on the PLA/PP blend‐matrix could not improve the tensile and flexural properties compared with PLA/hemp, however; the lighter composite with better impact properties was obtained. The crystallization temperature of the PLA‐PP/hemp increased compared with pure PLA. This result was also confirmed by the SEM micrographs. The moisture absorption of PLA‐PP/hemp was higher than PLA/hemp. Based on theoretical analysis of DMTA data, there was favorable adhesion in all composites. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40534.

show abstract

Section: Resultsmentioning

confidence: 99%

Mechanical and thermal characterization of compression moulded polylactic acid natural fiber composites reinforced with hemp and lyocell fibers

Baghaei

Skrifvars

Rissanen

et al. 2014

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…However, in order to better understand how diffusion mechanism influences mechanical properties it is of interest to have a comparison between different types of cellulose fiber composites .…”

Section: Resultsmentioning

confidence: 99%

Moisture uptake and resulting mechanical response of bio‐based composites. II. composites

2014

View full text Add to dashboard Cite

The durability of entirely bio‐based composites with respect to the exposure to elevated humidity was evaluated. Different combinations of bio‐based resins (Tribest, EpoBioX, Envirez) and cellulosic fibers (flax and regenerated cellulose fiber rovings and fabrics) were used to manufacture unidirectional and cross‐ply composite laminates. Water absorption experiments were performed at various humidity levels (41%, 70%, and 98%) to measure apparent diffusion coefficient and moisture content at saturation. Effect of chemical treatment (alkali and silane) of fibers as protection against moisture was also studied. However, fiber treatment did not show any significant improvement and in some cases the performance of the composites with treated fibers was lower than those with untreated reinforcement. The comparison of results for neat resins and composites showed that moisture uptake in the studied composites is primarily due to cellulosic reinforcement. Tensile properties of composites as received (RH = 24%) and conditioned (RH = 41%, 70%, and 98%) were measured in order to estimate the influence of humidity on behavior of these materials. Results were compared with data for glass fiber reinforced composite, as a reference material. Previous results from study of unreinforced polymers showed that resins were resistant to moisture uptake. Knowing that moisture sorption is primarily dominated by natural fibers, the results showed that some of the composites with bio‐based resins performed very well and have comparable properties with composites of synthetic epoxy, even at elevated humidity. POLYM. COMPOS., 36:1510–1519, 2015. © 2014 Society of Plastics Engineers

show abstract

“…Some holes are observed, mainly around the fibre bundles, explaining the non-reversibility of the damage. As underlined in the literature (Almgren et al, 2009), the swelling of plant fibre composites depends on the consolidation and on the available free volume fraction. Thus, the lack of cohesion and the swelling should be favoured by the presence of fibre bundles (Fig.…”

Section: Evolution Of the Biocomposite Damage Processmentioning

confidence: 98%

Long term immersion in natural seawater of Flax/PLA biocomposite

Duigou¹,

Bourmaud²,

Davies³

et al. 2014

Ocean Engineering

108

View full text Add to dashboard Cite

International audienceInnovation in sailing yacht design must include current environmental concerns such as resource depletion and waste management. Indeed most of the materials used today are petro-based and cannot offer viable end of life treatment. Fully biodegradable natural fibre reinforced biopolymers are being increasingly studied as they offer high specific stiffness and low environmental footprint. However, their ageing mechanisms are still not well understood.The present article gives information on 2 years natural seawater aging effect on injection-molded Flax/PLA biocomposite. Biocomposites suffer from relatively high moisture absorption which is controlled by the vegetal fibres. Simple rules of mixtures allow the determination of weight gain for flax fibres which is around 12%. Bundles of fibres and especially middle lamellae influence water uptake. Water alters flax fibres and their biocomposites, since their mechanical properties (Young’s modulus and tensile strength) are reduced with aging. A linear relationship is observed between water uptake and loss of mechanical properties. Load–unload cycles highlight damage occuring earlier than unaged biocomposites. This damage can be induced by fibre degradation and washing out of soluble components especially the fibre bundles cement, and by debonding of fibre bundles linked to their swelling

show abstract

Moisture uptake and hygroexpansion of wood fiber composite materials with polylactide and polypropylene matrix materials

Cited by 40 publications

References 23 publications

Mechanical and thermal characterization of compression moulded polylactic acid natural fiber composites reinforced with hemp and lyocell fibers

Mechanical and thermal characterization of compression moulded polylactic acid natural fiber composites reinforced with hemp and lyocell fibers

Moisture uptake and resulting mechanical response of bio‐based composites. II. composites

Long term immersion in natural seawater of Flax/PLA biocomposite

Contact Info

Product

Resources

About