Enhanced thermal and mechanical properties of epoxy composites by addition of hyperbranched polyglycerol grown on cellulose fibers

Xiao, Xiane; Lu, Shaorong; Pan, Leilei; Zeng, Cen; He, Zihai; Gao, Jian; Yu, Jinhong

doi:10.1007/s10965-016-0964-y

Cited by 10 publications

(6 citation statements)

References 62 publications

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“…38,39 The high crystalline nature of cellulose has been reported to improve mechanical properties of fiber-reinforced plastics. 40,41 Lignins and hemicelluloses have no free hydroxyl groups to react with the PP chains which leads to lower interfacial adhesion between fibers and matrices when the contents of lignin and hemicellulose are higher. 28 Therefore, low hemicellulose contents are desirable.…”

Section: Resultsmentioning

confidence: 99%

Development of fiber-reinforced polypropylene with NaOH pretreated rice and coffee husks as fillers: Mechanical and thermal properties

Yiga

Pagel

Lubwama

et al. 2019

Journal of Thermoplastic Composite Materials

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Incorporation of agricultural wastes as fillers in fiber-reinforced plastics is gaining momentum in plastics engineering research. In this study, fiber-reinforced polypropylene (PP) with rice and coffee husks as filler material were developed. The effect of alkali (sodium hydroxide) pretreatment of the husks on mechanical and thermal properties of developed PP biocomposites was observed. Filler material loading was varied from 0% to 20% for rice husks and 0% to 10% for coffee husks. A twin-screw extruder was used for compounding the PP matrix with rice and coffee husk filler materials. Tensile strengths and percentage elongation results varied from 27.4 to 37.4 MPa and 2.4% to 70.3% (unmodified coffee husks), 31.1 to 37.4 MPa and 5% to 70.3% (unmodified rice husks), 30.7 to 37.4 MPa and 5.3% to 70.3% (modified coffee husks), and 30.7 to 37.4 MPa and 4.8% to 70.3% (modified rice husks). Young’s modulus ranged between 1656 and 2247.8 MPa for biocomposite PP samples with unmodified filler material. Young’s modulus ranged between 1740 and 2160 MPa after alkali treatment of the filler material. Charpy impact strengths ranged from 1.2 to 4 kJ/m2 and 3.1 to 19.6 kJ/m2 for samples containing unmodified and modified filler material, respectively. Thermogravimetric analysis showed that an increase in filler content resulted into delayed weight loss at high degradation temperatures. The results suggest that these developed fiber-reinforced plastics can be used in applications requiring high thermal stability and good mechanical properties.

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Section: Resultsmentioning

confidence: 99%

Development of fiber-reinforced polypropylene with NaOH pretreated rice and coffee husks as fillers: Mechanical and thermal properties

Yiga

Pagel

Lubwama

et al. 2019

Journal of Thermoplastic Composite Materials

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“…In most cases, another treatment was combined, seeking synergy between them. Xiao et al (2016) treated sisal fibers using NaOH, Na 2 S, NaClO 2 , CH 3 COOH and ClCH 2 COOH producing (SCF-g-COOH). Once treated, hyperbranched polyglycerol (HPG) was grafted onto SCF-g-COOH producing SCF-g-HPG.…”

Section: Grafting Of Hyperbranched Polymersmentioning

confidence: 99%

Recent studies on modified cellulose/nanocellulose epoxy composites: A systematic review

Neves

Ornaghi

Zattera

et al. 2021

Carbohydrate Polymers

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Cellulose and its derivatives are widely explored for films and thickening of pharmaceutical solutions, in paints, as reinforcement in composites, among others. This versatility is due to advantages such as renewability, low cost, and environmental friendliness. When used in polymer composites, due to the hydrophilic character of the cellulose, surface chemical modification is highly recommended to improve its compatibility with the polymeric matrix. Hence, this paper presents a systematic review of chemically modified cellulose/epoxy resin composites focusing on the last five years. The investigation followed the PRISMA protocol that delivers a meticulous summary of all available primary research in response to a research question. After including/excluding steps, thirty-six studies were included in the review. The results were presented focusing on thermal, mechanical and dynamic-mechanical properties of the composites. In brief, this methodology helped identifying the main gaps in knowledge in that field.

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“…Nanosized NC contribute in influencing mechanical properties due to the larger surface area interact with matrix in the composites . Furthermore, NC possess multiple hydroxyl groups that are encouraging the chemical and physical interaction between NC and matrices result in increasing mechanical properties especially strength.…”

Section: Reinforcement In Composites Systemmentioning

confidence: 99%

“…Nanosized NC contribute in influencing mechanical properties due to the larger surface area interact with matrix in the composites. 107 Furthermore, NC possess multiple hydroxyl groups that are encouraging the chemical and physical interaction between NC and matrices result in increasing mechanical properties especially strength. By forming chemical and physical bonds in NC and matrix network composites, the molecular movements are constraint during stress was introduced due to the bonding that are holding the molecule together.…”

Section: Principle and Theorymentioning

confidence: 99%

Nanocellulose reinforced as green agent in polymer matrix composites applications

Rashid

Julkapli

Yehye

2018

Polymers for Advanced Techs

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Owing to their abundance, high strength and stiffness, and low weight and biodegradability, nanocellulose (NC) is regarded as a promising candidate for the preparation of green composites. The high reinforcing effect assigned to the mechanical percolation phenomenon of NC is due to the stiff continuous networks of cellulosic nanoparticles linked via hydrogen bonding. Compared to nanocrystalline cellulose, NC fibers result in more significant improvement to the modulus, stiffness, and strength as aspect ratio NC fiber is higher compared to NC crystal. Indeed, in the case of biopolymer composites, the reinforcement effect of NC is attributed to the NC‐polymer interactions and the reinforcing effect occurring through effective stress transfer at the NC‐polymer interface. The NC‐reinforced composites tend to become more brittle as the concentration of the reinforcing particles increase up to the saturated level, due to the reduction in surface adhesion between filler and matrix. Due to its promising mechanical and structural stability, NC composites have been used widely in many industrial applications such as food packaging, electronic applications, and tissue engineering.

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Enhanced thermal and mechanical properties of epoxy composites by addition of hyperbranched polyglycerol grown on cellulose fibers

Cited by 10 publications

References 62 publications

Development of fiber-reinforced polypropylene with NaOH pretreated rice and coffee husks as fillers: Mechanical and thermal properties

Development of fiber-reinforced polypropylene with NaOH pretreated rice and coffee husks as fillers: Mechanical and thermal properties

Recent studies on modified cellulose/nanocellulose epoxy composites: A systematic review

Nanocellulose reinforced as green agent in polymer matrix composites applications

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