Mechanical Properties and Dimensional Stabilities of Wood-Polypropylene Composites Prepared using Mechanochemically Acetylated Japanese Cedar (Cryptomeria japonica) Wood Meal

Kusumoto, Norihisa; Takata, Kanenori; Kurimoto, Yasuji

doi:10.15376/biores.11.2.3825-3839

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…Additionally, our group has developed a mechanochemical technique using a vibration rod mill to supply acetylated wood meals for WPC production and reported the characteristics of those wood meals and polypropylene composites. , In many cases, including the above examples, weight percent gain (WPG) and titration have been useful in determining the degree of acetylation, and the progress of the reactions has been confirmed by FT-IR spectroscopy. However, detailed information about the mechanochemical acetylation behavior of wood is still unavailable.…”

Section: Introductionmentioning

confidence: 99%

Pulverization and Chemical Modification of Wood in One Pod: Acetylation Behavior of Wood by Mechanochemical Processing with Rod-Milling Treatment

Ando

Kurimoto

Takata

2022

ACS Sustainable Chem. Eng.

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The acetylation behavior of wood during mechanochemical processing, which is a solvent-free treatment involving simultaneous grinding and chemical modification in a pod, was monitored by heteronuclear single quantum coherence-nuclear magnetic resonance (HSQC-NMR). In this research, acetylated wood powders (AcWPs) with different weight percent gain (WPG) values were prepared via mechanochemical processing and monitored. First, the primary hydroxyl groups of polysaccharides and lignin were acetylated during the initial reaction process. At this stage, a small portion of the benzyl hydroxyl groups in lignin were also acetylated despite their low reactivity. Subsequently, as the WPG increased, the secondary hydroxyl groups of the polysaccharides began to be acetylated. In this middle stage, almost all primary hydroxyl groups in most of the polysaccharides and lignin, except for a small fraction of those in cellulose, were acetylated. In the final stage, almost all hydroxyl groups in the polysaccharides and lignin were acetylated, although a few hydroxyl groups in cellulose and a few secondary hydroxyl groups in xylan and lignin remained. Then, we investigated the effect of mechanochemical acetylation on thermal resistance by using thermogravimetric analysis. Overall, mechanochemical acetylation markedly improved the thermal resistance of the obtained AcWPs.

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Section: Introductionmentioning

confidence: 99%

Pulverization and Chemical Modification of Wood in One Pod: Acetylation Behavior of Wood by Mechanochemical Processing with Rod-Milling Treatment

Ando

Kurimoto

Takata

2022

ACS Sustainable Chem. Eng.

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“…Khanjanzadeh et al analyzed the dimensional stability of replacing raw PP with recycled PP in the manufacturing of wood-plastic composites [32]. De Carvalho et al also reported the influence of mold material on the dimensional stability [33]; and Norihisa et al analyzed the dimensional stability of different PP wood composites [34]. Dimensional stability has also been increased through assisted-injection molding processes such as gas assisted injection molding [35,36].…”

Section: Introductionmentioning

confidence: 99%

Dimensional Stability and Process Capability of an Industrial Component Injected with Recycled Polypropylene

et al. 2019

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The usage of recycled polymers for industrial purposes arises as one of the most promising methods of reducing environmental impact and costs associated with scrapping parts. This paper presents a systematic study of the dimensional stability of a raw and 100% recycled polypropylene subjected to realistic environmental conditions occurring along its working life. The component studied is an internal part of an induction hob assembly. Industrial samples manufactured with both materials, in the same mold, and in the same injection machine, are subjected to ejection conditions, storage conditions (50 °C), and extreme performance conditions (80 °C). Induced dimensional changes are registered and analyzed using a coordinate measuring machine, and a tactile sensing probe. To verify the process capability of the samples manufacturing, Cp and Cpk values are calculated to evaluate the suitability of the recycled material as an alternative. Results conclude that, although the use of recycled material implies slight differences in terms of dimensional stability due to the changes induced in the polymer structure, these differences are not significant enough to affect the injection process capability. Therefore, recycling arises as one effective method to reduce both overruns associated with the consumption of raw polypropylene material and its environmental impact.

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Effect of Adhesive Content and Modification Method on Physical and Mechanical Properties of Eucalyptus Veneer–Poly-β-Hydroxybutyrate Film Composites

Chen¹,

Wang²,

Cao³

et al. 2018

Forest Products Journal

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Formaldehyde-based resin and petroleum-based plastic are often used as an adhesive in plywood manufacturing, which has an adverse effect on people's health and the global environment. We have investigated the plywoodlike composite with wood veneer (WV) and poly-β-hydroxybutyrate film (PHBF) as a novel formaldehyde-free and environmentally friendly composite (WV-PHBF). The composite was prepared with three veneers, and the PHBF placed between adjacent veneers varied from 22.5 to 112.5 g/m2. The composite was hot pressed at 170°C for 70 s/mm under a pressure of 1.0 MPa. Furthermore, the WV-PHBF with an adhesive dosage at 67.5 g/m2 was modified with three modification methods: silane coupling agent (KH-550), alkaline solution (NaOH), and polydiphenylmethane diisocyanate (p-MDI). Results showed the following: (1) under the untreated condition, a composite with more than 67.5 g/m2 adhesive will meet the Chinese National Standard (GB/T) 9846-2015 of bonding and bending strength requirements, and 90.0 g/m2 was the best; (2) the KH-550 and p-MDI treatment had a positive effect on WV-PHBF, but NaOH mainly had an adverse effect; (3) the physical–mechanical properties of the composite with 67.5 g/m2 adhesive content being processed by 1 percent by weight (wt%) KH-550 or 2 wt% p-MDI was better than WV-PHBF with 90 g/m2 adhesive content, especially in bonding strength; (4) statistical analysis shows that 1.0 wt% KH-550 significantly improved the bonding strength properties of WV-PHBF, and water-resistance properties were significantly improved by 2.0 wt% of p-MDI also; and (5) morphological observation shows that KH-550 and p-MDI treatments increase the interfacial compatibility between WV and PHBF of the composites.

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Mechanical Properties and Dimensional Stabilities of Wood-Polypropylene Composites Prepared using Mechanochemically Acetylated Japanese Cedar (Cryptomeria japonica) Wood Meal

Cited by 3 publications

References 16 publications

Pulverization and Chemical Modification of Wood in One Pod: Acetylation Behavior of Wood by Mechanochemical Processing with Rod-Milling Treatment

Pulverization and Chemical Modification of Wood in One Pod: Acetylation Behavior of Wood by Mechanochemical Processing with Rod-Milling Treatment

Dimensional Stability and Process Capability of an Industrial Component Injected with Recycled Polypropylene

Effect of Adhesive Content and Modification Method on Physical and Mechanical Properties of Eucalyptus Veneer–Poly-β-Hydroxybutyrate Film Composites

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