Silkworm silk/poly(lactic acid) biocomposites: Dynamic mechanical, thermal and biodegradable properties

Zhang, Yongqing; Cheung, Hoi-Yan; Lau, Kin-tak; Xu, Cai-Ling; Zhao, Dandan; Li, Hu‐Lin

doi:10.1016/j.polymdegradstab.2010.07.015

Cited by 69 publications

(49 citation statements)

References 42 publications

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“…This increase in E 0 is attributed to the increase of structure stiffness due to cold crystallization during DMA measurements. A similar increase in storage modulus after T g around 85°C was obtained for PLA and PLA/silk worm silk composites by Zhao et al [34]. Talc filled composites showed high storage modulus values at the glassy region.…”

Section: Dma Analysissupporting

confidence: 81%

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Studies on Melt Processable Biocomposites of Polylactic Acid

2014

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Melt processable microcrystalline cellulose (MCC)/poly(lactic acid) (PLA) composites were successfully prepared by twin-screw extrusion. Several characterization techniques were used to investigate the effect of MCC on rheological behavior, morphology, crystallization and melting behavior of the PLA and structure-property correlation of the MCC/PLA composites has been established. Rheological measurements showed that the addition of MCC has a dramatic influence on the low frequency relaxations of PLA chains and above 5 % of MCC, it forms percolated network structure. Differential scanning calorimeter analysis showed that MCC acted as nucleating agent enhancing crystallization below the percolation concentration. Properties of MCC/PLA composites have been compared with that of talc and CaCO 3 filled composites. Talc is found to be more effective in crystallizing PLA than MCC and CaCO 3 . MCC/PLA composites are found be melt processable like that of talc and CaCO 3 filled PLA composites.

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Section: Dma Analysissupporting

confidence: 81%

“…But in 10 % MCC composite, the (DH f ) value is lower, even lower than that of neat PLA indicating that MCC content above percolation threshold is retarding the crystallization of PLA. The crystallinity of PLA X c = (DH m /DH o ) where DH o is the enthalpy of fusion of 100 % crystalline PLA [34].…”

Section: Melt Rheologymentioning

confidence: 99%

Studies on Melt Processable Biocomposites of Polylactic Acid

2014

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“…The increase in additional MA content gradually decreases the melting temperature. This bimodal melting peak is induced during slow DSC scan while the less perfect crystals have enough time to be melted and reorganized into crystals with higher structural perfection, and re-melted at higher temperature [36,37]. Low-melting-temperature crystals have similar structure with high-melting-temperature ones, but with smaller lamellar thickness.…”

Section: Differential Scanning Calorimetrymentioning

confidence: 99%

Modification of poly(lactic acid)/poly(propylene carbonate) blends through melt compounding with maleic anhydride

Yao¹,

Deng²,

Mai³

et al. 2011

Express Polym. Lett.

104

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Maleic anhydride (MA) is incorporated into poly(lactic acid) (PLA)/poly(propylene carbonate) (PPC) blends to modify its properties through melt compounding. It is interesting to note that the toughness of PLA/PPC blends can be improved by 1355% while the strength is almost kept constant by adding very low content (as low as 0.9%) of MA into the blends. However, higher MA content in the blends leads to decrease in strength and further increase in toughness indicating an obvious plasticizing effect, while MA is shown to have no effect on the toughness of neat PLA. Rheological, scanning electron microscopy (SEM) and dynamic mechanical analysis (DMA) studies have been carried out to understand the above results. It is believed that the improvement in mechanical performance originated from the largely retained molecular weight of PPC and improved interfacial interaction after processing. And relative large amount of MA in the blends is shown to mainly plasticize the PPC phase rather than the PLA phase. Such an effective method could provide PLA based biodegradable polymer blends with novel properties for industrial applications

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“…While the increasing of the soil pH was due to higher soil water content, determined by moisture meter, which has neutralized the acidity of the soil. In addition, the degradation products of PLA were carbon dioxide, water and humus [11,13]. Soil water content for October 2013 till March 2014 was 99%, 98%, 95%, 90%, 43% and 77% respectively.…”

Section: Characterizationmentioning

confidence: 99%

Biodegradation Properties of Poly (Lactic) Acid Reinforced by Kenaf Fibers

et al. 2016

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This study was conducted to study the degradation of poly (lactic acid) and its composites under natural landfill burial. Composites reinforced with natural fibres were expected to degrade faster than polymer itself. PLA was compounded with kenaf bast fibre (KBC) and kenaf core fibre (KCC) with twin screw extrusion at temperature range 150-160• C and being compression moulded at 170• C for 8 minutes. Samples were then cut prior to testing by burying under composting area in UiTM Shah Alam, Selangor, Malaysia for 6 month period. Samples were measured and observed monthly for the degradation of composites by weight loss and microscopic observation. As expected weight loss for kenaf bast composite (KBC) and kenaf core composite (KCC) was found to be higher, 15.9% and 17.1% respectively, than that of pure PLA of only 4.14%. Microscopic observation confirms degradation has occurred on surface of composites by making cracks, holes, and black spots on all samples, however degradation was more obvious on composites. FTIR analysis shows that spectra of exposed composites were reduced compared to those of unexposed composites.

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Silkworm silk/poly(lactic acid) biocomposites: Dynamic mechanical, thermal and biodegradable properties

Cited by 69 publications

References 42 publications

Studies on Melt Processable Biocomposites of Polylactic Acid

Studies on Melt Processable Biocomposites of Polylactic Acid

Modification of poly(lactic acid)/poly(propylene carbonate) blends through melt compounding with maleic anhydride

Biodegradation Properties of Poly (Lactic) Acid Reinforced by Kenaf Fibers

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