Maleated wood-fiber/high-density-polyethylene composites: Coupling mechanisms and interfacial characterization

Lu, John Z.; Negulescu, Ioan I.; Wu, Qinglin

doi:10.1163/1568554053542133

Cited by 93 publications

(68 citation statements)

References 12 publications

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“…The evaluation of primary results did not offer an unambiguous explanation for these observations, thus we need further analysis in order to resolve these questions. Papers published in the literature showed that strong interaction, in most cases chemical bonds form between the active -OH groups of cellulose and the functionalized polymer [24,26]. However, the number of available groups depends on the size of the wood particles, which is relatively large compared to usual mineral fillers.…”

Section: Deformation and Failure Mechanism; Other Aspectsmentioning

confidence: 99%

“…Various techniques are used or at least tried for the improvement of 4 interfacial adhesion including the treatment of the wood with sodium hydroxide [4,19,20], coupling with functional silanes [4], or the coating of wood flour with stearic acid [21,22]. However, polymers functionalized with maleic anhydride (MA) or acrylic acid (AA) are introduced the most often into polyolefin composites [2][3][4]17,[19][20][21][22][23][24][25][26][27][28][29][30]. The functional groups of these polymers were shown to interact strongly or even react chemically with the surface of wood [17,24,26], while the long alkyl chains diffuse into the matrix making stress transfer possible.…”

Section: Introductionmentioning

confidence: 99%

“…However, polymers functionalized with maleic anhydride (MA) or acrylic acid (AA) are introduced the most often into polyolefin composites [2][3][4]17,[19][20][21][22][23][24][25][26][27][28][29][30]. The functional groups of these polymers were shown to interact strongly or even react chemically with the surface of wood [17,24,26], while the long alkyl chains diffuse into the matrix making stress transfer possible. The stiffness of the composites is not influenced significantly by the presence of the functionalized polymer [3,17,27], but strength usually increases considerably [2,3,17,19,27,28].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Wood flour filled PP composites: Compatibilization and adhesion

Dányádi

Janecska²,

Szabó³

et al. 2007

Composites Science and Technology

198

104

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Section: Deformation and Failure Mechanism; Other Aspectsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Wood flour filled PP composites: Compatibilization and adhesion

Dányádi

Janecska²,

Szabó³

et al. 2007

Composites Science and Technology

198

104

View full text Add to dashboard Cite

“…In the latter, the wood particles were embedded in the polymer matrix, and those protruding from it had scabs or fibrils (encircled in red), evidence of improved adhesion to the matrix. Lu et al (2005) reported similar results when a coupling agent was used in the preparation of WPCs. Fig.…”

Section: Scanning Electron Microscopymentioning

confidence: 53%

Interfacial Shear Strength Evaluation of Pinewood Residue/High-Density Polyethylene Composites Exposed to UV Radiation and Moisture Absorption-Desorption Cycles

et al. 2016

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In outdoor applications, the mechanical performance of wood-plastic composites (WPCs) is affected by UV radiation, facilitating moisture intake and damaging the wood-polymer interfacial region. The purpose of this study was to evaluate the effect of moisture absorption-desorption cycles (MADCs), and the exposure to UV radiation on the interfacial shear strength (IFSS) of WPCs with 40% pinewood residue and 60% highdensity polyethylene. One of the WPCs incorporated 5% coupling agent (CA) with respect to wood content. The IFSS was evaluated following the Iosipescu test method. The specimens were exposed to UV radiation using an accelerated weathering test device and subsequently subjected to four MADCs. Characterization was also performed by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The absorption and desorption of moisture was slower in non-UVirradiated WPCs, particularly in those with the CA. The UV radiation did not significantly contribute to the loss of the IFSS. Statistically, the CA had a favorable effect on the IFSS. Exposure of the samples to MADCs contributed to reduce the IFSS. The FTIR showed lignin degradation and the occurrence of hydrolysis reactions after exposure to MADCs. SEM confirmed that UV radiation did not significantly affect the IFSS.

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“…It could be inferred that the monomers had become grafted onto the powder PE or onto the melting PE wax. Since WF is a lignocellulosic fiber, it has many hydroxyl groups that easily form chemical bonds with anhydride groups or isocyanate groups and form physical interactions with polar groups (Kazayawoko et al 1999;Li and Matuana 2003;Lu et al 2005). For this research, the suggested interfacial interaction mechanism of GPE to rPE/WF composites was that GPE afforded strong interfacial interactions between rPE and wood flour by chemically bonding with MAH or physically interacting with MMA and BA at the interfaces (Bledzki and Gassan 1999;Hong et al 2014), as shown in Fig.…”

Section: Interfacial Interaction Mechanism Of Rpe/wf Compositesmentioning

confidence: 94%

Blossom Morphology and Correlative Performance Improvement of Recycled Polyethylene/Wood Flour Composites with Steam-Activated Interfaces

Hong¹,

Líu²,

Zhang³

et al. 2015

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Interfacial compatibility plays a key role in the performances of natural fiber-reinforced composites. The measures commonly used to improve the interfacial compatibility focus more on the addition of various compatibilizers than on the structural modification of the natural fiber. In this paper, an attempt was made to enlarge the interfacial interaction areas of the recycled polyethylene (rPE)/wood flour (WF) composites by steaming the WF. Multi-monomer graft copolymers of polyethylene (GPE) were used as compatibilizers for the composites. How the enlarged interfaces affected the morphology, mechanical properties, water resistance, thermal stability, and dynamic rheological properties of the rPE/WF composites was investigated. The steaming process was able to enlarge the voids of the WF and therefore activate more interfaces for interactions. It was found that the interfacial morphology of the composites was affected by the degree of interfacial compatibility of the composites and so was characterized by various distinctive blossom shapes having a variation of compositions. With the help of GPE, the steaming process was able to significantly improve the interfacial compatibility of the composites and therefore improve the mechanical properties, water resistance, thermal stability, and dynamic rheological properties of the composites.

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Maleated wood-fiber/high-density-polyethylene composites: Coupling mechanisms and interfacial characterization

Cited by 93 publications

References 12 publications

Wood flour filled PP composites: Compatibilization and adhesion

Wood flour filled PP composites: Compatibilization and adhesion

Interfacial Shear Strength Evaluation of Pinewood Residue/High-Density Polyethylene Composites Exposed to UV Radiation and Moisture Absorption-Desorption Cycles

Blossom Morphology and Correlative Performance Improvement of Recycled Polyethylene/Wood Flour Composites with Steam-Activated Interfaces

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