Thermal Properties of Wood-Plastic Composites with Different Compositions

Guo, Yong; Zhu, Shiliu; Chen, Yuxia; Li, Dagang

doi:10.3390/ma12060881

Cited by 60 publications

(29 citation statements)

References 39 publications

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“…It was suggested that the addition of NCC impeded the movement of the molecular chain of the composites, thus reducing the regular arrangement. The presence of NCC caused the molecular chain to be less likely to diffuse into the crystal nucleus, and lowered the crystal growth rate that subsequently decreased the crystallinity [ 61 ]. Instead of being the sufficient nucleating agent, the surface of NCC was partially attached to the sulfate group as a by-product of the acid hydrolysis process, and limited the nucleation of the PP matrix, which decreased the crystallinity of the nanocomposites.…”

Section: Resultsmentioning

confidence: 99%

The Effects of Unbleached and Bleached Nanocellulose on the Thermal and Flammability of Polypropylene-Reinforced Kenaf Core Hybrid Polymer Bionanocomposites

et al. 2020

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The thermal, thermo-mechanical and flammability properties of kenaf core hybrid polymer nanocomposites reinforced with unbleached and bleached nanocrystalline cellulose (NCC) were studied. The studied chemical composition found that unbleached NCC (NCC-UB) had 90% more lignin content compared to bleached NCC (NCC-B). Nanocelluloses were incorporated within polypropylene (PP) as the matrix, together with kenaf core as a main reinforcement and maleic anhydride grafted polypropylene (MAPP) as a coupling agent via a melt mixing compounding process. The result showed that the thermal stability of the nanocomposites was generally affected by the presence of lignin in NCC-UB and sulfate group on the surface of NCC-B. The residual lignin in NCC-UB appeared to overcome the poor thermal stability of the composites that was caused by sulfation during the hydrolysis process. The lignin helped to promote the late degradation of the nanocomposites, with the melting temperature occurring at a relatively higher temperature of 219.1 °C for PP/NCC-UB, compared to 185.9 °C for PP/NCC-B. Between the two types of nanocomposites, PP/NCC-B had notably lower thermo-mechanical properties, which can be attributed to the poor bonding and dispersion properties of the NCC-B in the nanocomposites blend. The PP/NCC-UB showed better thermal properties due to the effect of residual lignin, which acted as a compatibilizer between NCC-UB and polymer matrix, thus improved the bonding properties. The residual lignin in PP/NCC-UB helped to promote char formation and slowed down the burning process, thus increasing the flame resistance of the nanocomposites. Overall, the residual lignin on the surface of NCC-UB appeared to aid better stability on the thermal and flammability properties of the nanocomposites.

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Section: Resultsmentioning

confidence: 99%

The Effects of Unbleached and Bleached Nanocellulose on the Thermal and Flammability of Polypropylene-Reinforced Kenaf Core Hybrid Polymer Bionanocomposites

et al. 2020

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“…This reduction in the melting enthalpy can be correlated with the dilution effect of the SiC particles within the PBS matrix. In addition, the incorporation of SiC limits the movement of the PBS molecular chain and the released melting enthalpy is reduced, leading to changes in the crystalline properties of the PBS composites [28]. The degrees of crystallinity of the semi crystalline PBS composites were calculated using Equation (2):…”

Section: Resultsmentioning

confidence: 99%

Thermomechanical Properties of SiC-Filled Polybutylene Succinate Composite Fabricated via Melt Extrusion

2020

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Polybutylene succinate (PBS) composites filled with various mass fractions of silicon carbide (SiC) particles were fabricated via slow melt extrusion. The morphological analysis revealed that the fabrication technique assisted in achieving a good adhesion between the PBS and SiC, along with excellent filler dispersion throughout the PBS matrix. The inclusion of 40 wt.% SiC in the PBS composite afforded a 10 • C increase in the thermal degradation temperature and a 160% enhancement in the thermal conductivity relative to the neat PBS. The crystallization temperature also increased with the inclusion of SiC particles, thus making the composites easier to process. Furthermore, the improvement in the Young's modulus of the PBS composites increased their rigidity and stiffness relative to the neat PBS.

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“…This is also visible in the shape of the melting peaks presented in Figure 8c,d, where the peaks of the WPC are smaller but also rather wider than those of the nanocomposites (full thermograms can be found in Figures S3 and S4). The reason can be attributed to the significant increase in the viscosity of the polymer at such high content of reinforcements, which can restrict the movement of the polymer chains obstructing them from diffusion to the crystal nuclei [33]. However, the experimental scatter is rather high, and more specimens have to be tested to exclude possible influence of material inhomogeneity.…”

Section: Differential Scanning Calorimetrymentioning

confidence: 99%

Characterization of Wood and Graphene Nanoplatelets (GNPs) Reinforced Polymer Composites

Al-Maqdasi

Gong²,

Nyström³

et al. 2020

Materials

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This paper investigates the utilization of commercial masterbatches of graphene nanoplatelets to improve the properties of neat polymer and wood fiber composites manufactured by conventional processing methods. The effect of aspect ratio of the graphene platelets (represented by the different number of layers in the nanoplatelet) on the properties of high-density polyethylene (HDPE) is discussed. The composites were characterized for their mechanical properties (tensile, flexural, impact) and physical characteristics (morphology, crystallization, and thermal stability). The effect of the addition of nanoplatelets on the thermal conductivity and diffusivity of the reinforced polymer with different contents of reinforcement was also investigated. In general, the mechanical performance of the polymer was enhanced at the presence of either of the reinforcements (graphene or wood fiber). The improvement in mechanical properties of the nanocomposite was notable considering that no compatibilizer was used in the manufacturing. The use of a masterbatch can promote utilization of nano-modified polymer composites on an industrial scale without modification of the currently employed processing methods and facilities.

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Thermal Properties of Wood-Plastic Composites with Different Compositions

Cited by 60 publications

References 39 publications

The Effects of Unbleached and Bleached Nanocellulose on the Thermal and Flammability of Polypropylene-Reinforced Kenaf Core Hybrid Polymer Bionanocomposites

The Effects of Unbleached and Bleached Nanocellulose on the Thermal and Flammability of Polypropylene-Reinforced Kenaf Core Hybrid Polymer Bionanocomposites

Thermomechanical Properties of SiC-Filled Polybutylene Succinate Composite Fabricated via Melt Extrusion

Characterization of Wood and Graphene Nanoplatelets (GNPs) Reinforced Polymer Composites

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