Effect of wood flour as nucleating agent on the isothermal crystallization of poly(lactic acid)

Wu, Wei; Wu, Guangfeng; Zhang, Huixuan

doi:10.1002/pat.3881

Cited by 31 publications

(27 citation statements)

References 38 publications

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“…9 that the MFR increases with increasing of the MgPA concentration, and the MFR of PLLA/5%MgPA sample is considerably enhanced up to, at least, 16 times with respect to the primary PLLA, implying that the MgPA can improve significantly the fluidity of the PLLA. In addition, the mechanical properties of semicrystalline polymers are related to the crystallinity [28]. through aforementioned non-isothermal crystallization analysis, it is a fact that MgPA can accelerate the crystallization of PLLA.…”

Section: Fluidity and Mechanical Propertiesmentioning

confidence: 99%

Poly(L-lactic acid) Modified by Magnesium Phenylmalonate: Thermal Behavior, Processing Fluidity, and Mechanical Properties

Tian¹,

Cai²

2018

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This study presents the role of the magnesium phenylmalonate (MgPA) in the thermal behavior, fluidity, and mechanical properties of Poly(L-lactic acid) (PLLA). The results from non-isothermal crystallization investigation showed that the presence of MgPA as a heterogeneous nucleating agent facilitated the crystallization of PLLA in cooling. Additionally, the non-isothermal crystallization behavior of PLLA/MgPA was affected significantly by MgPA concentration, the cooling rate, and the final melting temperature. Melting behavior of PLLA/MgPA under different testing conditions further confirmed the crystallization accelerating effect of MgPA for PLLA, and the double melting peaks of PLLA/MgPA system mainly assigned to the melting-recrystallization mechanism. A decrease of the onset decomposition temperature indicated that the incorporation of MgPA reduced the thermal stability of PLLA, but the effect of MgPA on the thermal decomposition profile of PLLA is negligible. Compared to the primary PLLA, the addition of MgPA could improve significantly the fluidity of the PLLA, and the fluidity became better with increasing of MgPA concentration in PLLA matrix. MgPA of 0.2 wt.% to 2 wt.% could make the tensile strength of PLLA increase, however, a continuous drop in elongation at break was also observed.

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Section: Fluidity and Mechanical Propertiesmentioning

confidence: 99%

Poly(L-lactic acid) Modified by Magnesium Phenylmalonate: Thermal Behavior, Processing Fluidity, and Mechanical Properties

Tian¹,

Cai²

2018

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“…However, inorganic nucleating agents and PLA exhibit poor compatibility, negatively affecting the mechanical properties and biodegradability of PLA 24,25 . By contrast, natural organic fibers have gained increasing attention because of their biological friendliness and natural renewability 26‐28 . Lignin, the second most abundant natural polymer after cellulose, exhibits numerous properties, such as biodegradability, biocompatibility, high thermal stability, and good nucleation effects 29,30 .…”

Section: Introductionmentioning

confidence: 99%

Increased expansion ratio, cell density, and compression strength of microcellular poly(lactic acid) foams via lignin graft poly(lactic acid) as a biobased nucleating agent

Zong

Chai

et al. 2020

Polymers for Advanced Techs

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Green and renewable foaming poly(lactic acid) (PLA) represents one of the promising developments in PLA materials. This study is the first to use the lignin graft PLA copolymer (LG‐g‐PLA) to improve the foamability of PLA as a biobased nucleating agent. This agent was synthesized via ring‐opening polymerization of lignin and lactide. The effects of LG‐g‐PLA on cell nucleation induced by the crystallization, rheological behavior, and foamability of PLA were evaluated. Results indicated that LG‐g‐PLA can improve the crystallization rate and crystallinity of PLA, and play a significant nucleation role in the microcellular foam processing of PLA. LG‐g‐PLA improved the foam morphology of PLA, obtaining a reduced and uniform cell size as well as increased expansion ratio and cell density. With the addition of 3 wt% LG‐g‐PLA content, the PLA/LG‐g‐PLA foams increased the compressive strength 1.6 times than that of neat PLA foams. The improved foaming properties of PLA via a biobased nucleating agent show potential for the production and application of green biodegradable foams.

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“…For example, it is bio‐based since the PLLA can be obtained from sources such as starch, corn and cassava. In addition, it is biodegradable and biocompatible, catering to the consideration for environmental protection . Furthermore, the material can be readily processed and the product is transparent.…”

Section: Introductionmentioning

confidence: 99%

“…To address this compatibility issue, organic materials such as starch, wood flour and natural fibers have been used in PLLA as nucleating agents; however, most of these organic materials have poor heat resistance properties, causing deterioration of the overall material property when the final product is subjected to elevated temperatures …”

Section: Introductionmentioning

confidence: 99%

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Effects of divinylbenzene‐maleic anhydride copolymer hollow microspheres on crystallization behaviors, mechanical properties and heat resistance of poly(l‐lactide acid)

Qiao

Wang

et al. 2019

Polymers for Advanced Techs

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Divinylbenzene‐maleic anhydride copolymer hollow microspheres (DMs) were used as novel organic nucleating agents to promote crystallization of poly(l‐lactide acid) (PLLA). The effects of these DMs on crystal behaviors of the PLLA were investigated by differential scanning calorimeter (DSC), polarizing optical microscopy (POM), and wide angle X‐ray diffraction (WAXD). Both isothermal and non‐isothermal processes in DSC demonstrated that the DMs significantly altered the crystal behaviors of PLLA as both crystallization velocity and degree of crystallinity increased with increasing DM loadings from 0 to 3%. Our POM results also indicated that as nucleating agents, the DMs promoted nucleating densities and decreased spherulitic sizes. In addition, WAXD suggeted that the addition of DMs did not induce new types of crystals. Finally, our results showed that the ductility of the PLLA was enhanced by a small amount of DMs during the PLLA crystallization process since 0.5% DMs added to the PLLA resulted in 1.4‐fold increase in the elongation at break in comparision with the neat PLLA.

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Effect of wood flour as nucleating agent on the isothermal crystallization of poly(lactic acid)

Cited by 31 publications

References 38 publications

Poly(L-lactic acid) Modified by Magnesium Phenylmalonate: Thermal Behavior, Processing Fluidity, and Mechanical Properties

Poly(L-lactic acid) Modified by Magnesium Phenylmalonate: Thermal Behavior, Processing Fluidity, and Mechanical Properties

Increased expansion ratio, cell density, and compression strength of microcellular poly(lactic acid) foams via lignin graft poly(lactic acid) as a biobased nucleating agent

Effects of divinylbenzene‐maleic anhydride copolymer hollow microspheres on crystallization behaviors, mechanical properties and heat resistance of poly(l‐lactide acid)

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