Mechanical Properties and VOC Emission of Hemp Fibre Reinforced Polypropylene Composites: Natural Freezing-mechanical Treatment and Interface Modification

Li, Zhigang; Wei, Xinpei; Liu, Junhui; Han, Hongjiang; Jia, Hongjie; Song, Jiawang

doi:10.1007/s12221-021-0052-8

Cited by 7 publications

(7 citation statements)

References 25 publications

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“…However, at the same time, the inclusion of carbon fibers to some extent restricts the movement of PVC molecular chains, enhances the thermal stability of the foaming material, and delays aging and thermal decomposition under hightemperature conditions, thereby reducing the total VOC emissions. Similar results were also observed in hemp-fiber-reinforced polypropylene composites, where the VOC emissions reduction was attributed to the thermal stability enhancement through fiber reinforcement, as evidenced by the differential thermal analysis (DTA) and thermogravimetric analysis (TGA) [39]. Gu et al [40] clearly showed that PU composite foam had improved cell size and higher glass transition temperature (T g ) due to the presence of wood fiber characterized by thermal gravimetric analysis (TGA) and differential scanning calorimetry (DSC) results.…”

Section: Voc Emissions Evaluationsupporting

confidence: 74%

Innovative CF/PVC Foam Applicated for Automotive Synthetic Leather with High-Performance and Reduced VOC Emissions

Li,

Wu,

et al. 2024

Materials

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Polyvinyl chloride (PVC) foam, valued for its mechanical and thermal properties along with cost-effectiveness, is extensively utilized across diverse industries. However, its high volatile organic compound (VOC) emissions hinder its adoption in eco-friendly synthetic leather. This study proposes a solution by optimizing the formulation design and foaming processes and achieving mechanical property enhancement via carbon-fiber-reinforced PVC composite foam (CF/PVC). The aim is to reduce PVC usage via enhancing its intrinsic properties. Systematic investigations were carried out on the impact of foaming raw materials, foaming processes, fiber content, and fiber length on the foaming performance, mechanical properties, and VOC emissions. The material formulation and process parameters were successfully optimized. Further assessment of various indicators such as the density, mechanical properties, and tear resistance of synthetic leather samples confirmed that the innovative CF/PVC foam developed in this study meets the requirements for automotive interior applications. Notably, the tensile strength and tear resistance of CF/PVC composite synthetic leather increased by 50% and 29%, respectively, compared to pure PVC, while VOC emissions decreased by 28%. It is anticipated that a more pronounced reduction in VOC emissions will be achieved in practical automotive interior leather applications when further considering the reinforcing effect of fibers, which leads to a reduction in PVC usage. The findings present a technical reference for innovative applications, aiming to enhance PVC foam performance and minimize emissions.

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Section: Voc Emissions Evaluationsupporting

confidence: 74%

Innovative CF/PVC Foam Applicated for Automotive Synthetic Leather with High-Performance and Reduced VOC Emissions

Li,

Wu,

et al. 2024

Materials

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“…The band centered at 1332 cm −1 is due to CH bending of cellulose and hemicellulose. band at 1430 cm −1 is from the bending vibrations of hemicellulose COH and lignin CH 2 40 . The band centered at 1735 cm −1 corresponds to the stretching vibrations of acetyl CO in hemicellulose.…”

Section: Resultsmentioning

confidence: 99%

“…band at 1430 cm À1 is from the bending vibrations of hemicellulose C OH and lignin CH 2 . 40 The band centered at 1735 cm À1 corresponds to the stretching vibrations of acetyl C O in hemicellulose. The band centered at 1640 cm À1 from lignin C O stretching vibrations.…”

Section: Ft-ir Spectroscopy Analysismentioning

confidence: 99%

Study on the mechanical properties of ramie fiber/polypropylene composites prepared by hot pressing after the carding machine mixing

Jin,

Huang,

Guo

et al. 2024

Polymer Composites

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A growing variety of composites utilize natural plant fibers with naturally occurring veins structured hierarchically in an effort to reduce dependence on petroleum‐based materials. In this article, ramie fibers were extracted by alkaline delignification. Then, ramie fibers and PP matrix, were prepared in filament form and an amino‐silane coupling agent KH550, and maleic anhydride grafted polypropylene were added to improve interfacial compatibility. Ramie fiber/polypropylene fiber‐reinforced polymer composites (FRC) were prepared by hot pressing after using a carding machine. This method preserves the structure and length of ramie fibers to a large extent, thus greatly improving the mechanical properties of the material. After optimization, the FRC prepared from plant fibers of 2 cm length and 60% content had a density of 0.95 g/cm3, showed an increase in tensile and flexural strength of 276% and 339%, respectively, compared to the pure PP matrix. The specific strength of the FRC in the work was higher than galore FRC prepared from talc, carbon fiber, other plant fibers, and so forth. The FRC has a wide range of potential applications due to its own low‐cost, lightweight, and high‐performance, and is highly feasible in replacing the current polymers in the preparation of numerous everyday items.Highlights The preparation method of FRC resulted in a more complete fiber length and structure. The mechanism to improve the interfacial compatibility of RF and PP is discussed. The effect of varying fiber length on the FRC mechanical properties was investigated.

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“…Surface development of GTR particles during thermomechanical treatment facilitates VOC emissions from filler but simultaneously may provide additional interactions with the PU matrix, including covalent bonding between isocyanates and hydroxyl groups present on the surface of rubber particles. It leads to the strengthening of interfacial interactions with the PU matrix and better encapsulation of GTR particles by the PU matrix, hindering VOC emissions from the final composite (Li et al 2021 ).…”

Section: Resultsmentioning

confidence: 99%

Management of ground tire rubber waste by incorporation into polyurethane-based composite foams

Hejna

Kosmela

Olszewski

et al. 2023

Environ Sci Pollut Res

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Rapid economic growth implicated the developing multiple industry sectors, including the automotive branch, increasing waste generation since recycling and utilization methods have not been established simultaneously. A very severe threat is the generation of enormous amounts of post-consumer tires considered burdensome waste, e.g., due to the substantial emissions of volatile organic compounds (VOCs). Therefore, it is essential to develop novel, environmentally friendly methods for their utilization, which would hinder their environmental impacts. One of the most promising approaches is shredding, resulting in the generation of ground tire rubber (GTR), which can be introduced into polymeric materials as filler. The presented work is related to the thermomechanical treatment of GTR in a twin-screw extruder with zinc borate, whose incorporation is aimed to enhance shear forces within the extruder barrel. Modified GTR was introduced into flexible polyurethane (PU) foams, and the impact of modification parameters on the cellular structure, static and dynamic mechanical performance, thermal stability, as well as thermal insulation, and acoustic properties was investigated. Emissions of VOCs from applied fillers and prepared composites were monitored and evaluated. Depending on the treatment parameters, beneficial changes in foams’ cellular structure were noted, which enhanced their thermal insulation performance, mechanical strength, and thermal stability. It was proven that the proposed method of GTR thermomechanical treatment assisted by zinc borate particles might benefit the performance of flexible PU foamed composites and hinder VOC emissions, which could broaden the application range of GTR and provide novel ways for its efficient utilization.

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Mechanical Properties and VOC Emission of Hemp Fibre Reinforced Polypropylene Composites: Natural Freezing-mechanical Treatment and Interface Modification

Cited by 7 publications

References 25 publications

Innovative CF/PVC Foam Applicated for Automotive Synthetic Leather with High-Performance and Reduced VOC Emissions

Innovative CF/PVC Foam Applicated for Automotive Synthetic Leather with High-Performance and Reduced VOC Emissions

Study on the mechanical properties of ramie fiber/polypropylene composites prepared by hot pressing after the carding machine mixing

Management of ground tire rubber waste by incorporation into polyurethane-based composite foams

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