Effect of fiber volume fraction on the thermal and mechanical behavior of polylactide‐based composites incorporating bamboo fibers

Wang, Fang; Yang, Mengqing; Zhou, Shujue; Ran, Siyan; Zhang, Junqian

doi:10.1002/app.46148

Cited by 31 publications

(28 citation statements)

References 45 publications

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“…More importantly, natural fiber composites always exhibit weak interfacial compatibility between these combined constituents, which is explained by the fact that hydroxyl groups on the fiber surface absorb water molecules and form hydrogen bonds, impeding an intimate intermolecular contact with a hydrophobic polymer matrix [9,10]. As a result, bamboo fibers cannot be easily penetrated into the matrix during the process of composite fabrication, resulting in fiber non-uniform dispersion within the matrix [11,12]. The poor interaction between fibers with matrix reduces the composite interfacial compatibility, leading to ineffective load transfer from the matrix to neighboring fibers.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fiber Surface Modification on the Interfacial Adhesion and Thermo-Mechanical Performance of Unidirectional Epoxy-Based Composites Reinforced with Bamboo Fibers

et al. 2019

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In this work, bamboo fibers are chemically modified with NaOH solution of 1, 4, and 7 wt% concentrations at room temperature, respectively, and subsequently the untreated and treated fibers are prepared with epoxy resin for unidirectional composites by hot pressing molding technique. Tensile and micro-bond tests are conducted on the composite specimens to obtain mechanical properties, such as tensile strength and modulus, elongation at break, and interfacial strength. Besides, scanning electron microscopy (SEM) is employed to perform morphological observations for constituent damages. In addition, the influence of alkali concentration on the thermal performance of epoxy-based composites is examined by using differential scanning calorimetry (DSC) and thermogravimetric (TG) analysis. It is found that composite tensile strength reaches the maximum when the alkali concentration is 4%, increased by 45.24% compared with untreated composites. The composite elongation at break increases on increasing the concentration. Inversely, the composite modulus decreases as the concentration increases. Besides, the results demonstrate that the chemical treatment on the fiber surface could improve interface adhesion, as observed from its topography by SEM. Micro-bond test reveals that there is maximum interfacial shear strength when the alkali concentration is 4%, which increases by 100.30% in comparison with the untreated samples. In case of thermal properties, the DSC analysis indicates that the glass transition temperature is maximized at 4% alkali concentration, which is increased by 12.95%, compared to those from unmodified fibers. In addition, TG results show that the 4% concentration also facilitates thermal stability improvement, indicative of superior interfacial bonding.

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Section: Introductionmentioning

confidence: 99%

Effect of Fiber Surface Modification on the Interfacial Adhesion and Thermo-Mechanical Performance of Unidirectional Epoxy-Based Composites Reinforced with Bamboo Fibers

et al. 2019

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“…The approach was analogous even for polar polymers . Composites with continuous bamboo fibers were also processed and specific attention was paid to their tensile strength and impact resistance . Nevertheless, the interest in mechanical analysis in the linear region like dynamic mechanical analyses (DMAs) was emphasized …”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of continuous bamboo fiber‐reinforced biobased polyamide 11 composites

Haddou

Dandurand

Dantras

et al. 2019

J of Applied Polymer Sci

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This study is devoted to the analysis of the properties of continuous bamboo fiber (BF)-reinforced polyamide 11 (PA 11) composites. The SEM observations highlighted continuity between BFs and the polymeric matrix showing a high density of hydrogen bonds. The comparative calorimetric study of the matrix and its composites showed that the crystallinity of PA 11 was not modified by the presence of bamboo fibers. The physical aging observed in PA 11 is no more observed in composites due to physical interactions between PA 11 and BFs. The mechanical properties were investigated by tensile strength and dynamic mechanical analysis. The introduction of BFs enhanced Young's modulus of the matrix by a factor of 10. The presence of BFs also improved the storage shear modulus G 0 over the whole temperature range.

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“…Figure a illustrates that there is a remarkable difference in the thermal behavior between the epoxy resin and composites in the first heating run. In fact, the thermal behavior is always affected by the moisture, additives, induced inner stress and other factors . For example, the stress relaxation peaks are observed in the region of glass transition, which affects the thermal transition estimation.…”

Section: Resultsmentioning

confidence: 99%

“…When the temperature increases to 360.2°C, the depolymerization and degradation of hemicellulose and cellulose in bamboo fibers contribute to the weight loss . Hemicellulose begins to decompose at about 270–300°C and subsequently cellulose decomposes at 300–390°C . Additionally, the decomposition peaks of various composites are shifted to a higher temperature with increasing the fiber volume fraction, which are 338.2, 342.3, and 347.4°C, respectively, exhibiting a difference between the composites and resin (331.3°C).…”

Section: Resultsmentioning

confidence: 99%

“…There is a maximum value with V f = 50%, which is about five times higher than that of neat resin. Thus, the addition of bamboo fibers could improve the composite mechanical properties, which is expected as a result of the sufficient effect of fibers that has a relatively higher stiffness than that of epoxy . In addition, loads are allowed to efficiently transfer from matrix to fibers when the fiber content increases, leading to an enhancement of composite mechanical performance.…”

Section: Resultsmentioning

confidence: 99%

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Thermal and mechanical performance of unidirectional composites from bamboo fibers with varying volume fractions

et al. 2019

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In this work, a simple hand lay-up technique was employed to fabricate bamboo fiber reinforced epoxy resin composites, and subsequently composites with different fiber volume fractions (0%, 30%, 50%, and 70%) were prepared. To investigate the composite thermal properties, differential scanning calorimetry (DSC), thermogravimetric (TG) analysis, and dynamic mechanical analysis (DMA) were used. DSC demonstrates a decrease of glass transition temperature when fibers are incorporated into epoxy resin. TG results reveal that the degradation temperature increases with increasing the fiber content, and then a better thermal stability is achieved. The thermal results indicate that bamboo fibers provide a good resistance for heat insulation, suppressing the epoxy thermal decomposition. DMA shows that both storage modulus and loss modulus increase with increasing the fiber volume fraction in the temperature range of 30-200 C. Tensile tests and scanning electron microscopy (SEM) were also conducted on the specimens to investigate the material mechanical behavior. Compared with epoxy resin, the composites incorporated with bamboo fibers exhibit an improved tensile strength and modulus. The detailed analysis reveals that bamboo fibers have a positive effect on the thermo-mechanical properties of epoxy resin, providing a feasibility to using natural composites in a specific construction. POLYM. COMPOS., 40:3929-3937, 2019.

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Effect of fiber volume fraction on the thermal and mechanical behavior of polylactide‐based composites incorporating bamboo fibers

Cited by 31 publications

References 45 publications

Effect of Fiber Surface Modification on the Interfacial Adhesion and Thermo-Mechanical Performance of Unidirectional Epoxy-Based Composites Reinforced with Bamboo Fibers

Effect of Fiber Surface Modification on the Interfacial Adhesion and Thermo-Mechanical Performance of Unidirectional Epoxy-Based Composites Reinforced with Bamboo Fibers

Mechanical properties of continuous bamboo fiber‐reinforced biobased polyamide 11 composites

Thermal and mechanical performance of unidirectional composites from bamboo fibers with varying volume fractions

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