Degradation behaviors and crystallization of rapidly degradable polylactic acid prepared by melting through coordination complexation reaction

Xu, Mengxia; Xia, Xiaosong; Luo, Zhu; Liao, Jingshun; He, Ruhui; Yang, Shenglong; Yang, Le

doi:10.1016/j.mtcomm.2023.107789

Materials Today Communications

2024

DOI: 10.1016/j.mtcomm.2023.107789

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Degradation behaviors and crystallization of rapidly degradable polylactic acid prepared by melting through coordination complexation reaction

Mengxia Xu,

Xiaosong Xia,

Zhu Luo

et al.

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2024

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Cited by 2 publications

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Study of polypropylene/polyethylene terephthalate blends compatibilized with polypropylene double‐grafted maleic anhydride and epoxy resin

Xu,

Liao,

Luo

et al. 2024

J of Applied Polymer Sci

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Polypropylene double‐grafted maleic anhydride and bisphenol A epoxy resin (PP‐g‐M‐E) was successfully prepared by a single‐step method and characterized by Fourier‐transform infrared spectroscopy. Subsequently, it was employed as a compatibilizer to fabricate polypropylene (PP)/polyethylene terephthalate (PET) blends via melt extrusion. The content of the PET dispersed phase in the composite varied from 0 to 30 phr. The microstructure and morphology of the composites were characterized using scanning electron microscopy and Raman spectroscopy. The addition of PP‐g‐M‐E increased the interfacial interaction between the two phases and improved the compatibility and thermal stability of the system. In the presence of the compatibilizer, the crystallinity of the matrix phase (PP) increased, while that of the dispersed phase (PET) decreased owing to the heterogeneous nucleation effect of uniformly distributed PET. Double grafting of the PP‐g‐M‐E compatibilizer considerably enhanced the mechanical performance of the PP/PET blend system. The elongation at break of the modified sample exceeded that of the PP/PET blends by 117.55%, and the flexural and impact properties also showed considerable improvement.

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Study of polypropylene/polyethylene terephthalate blends compatibilized with polypropylene double‐grafted maleic anhydride and epoxy resin

Xu,

Liao,

Luo

et al. 2024

J of Applied Polymer Sci

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Hydrogen Peroxide-Induced Controlled Degradation of Poly(lactic acid) for Melt-Blown Nonwovens

Binley,

Jubinville,

Prince

et al. 2024

ACS Appl. Polym. Mater.

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This study aimed to increase the melt flow index (MFI) of poly(lactic acid) (PLA) through aqueous hydrogen peroxide (H 2 O 2 )-induced degradation. From this work, the impacts of hydrogen peroxide concentration and processing time were examined with samples that were prepared through reactive melt batch mixing. The hydrogen peroxide treatment and change in processing times were shown to decrease molar mass (M W ) to various degrees, up to 70%. Overall crystallinity was only decreased with lower peroxide concentrations, while the glass transition temperature was reduced by 4 to 11% among all treated samples. Results confirm degradation via random chain scission with additional contributions from heat, hydrolysis, and potential alcoholysis. All results concur with the finding that lower peroxide concentrations paired with longer processing times result in the most effective degradation, while higher peroxide concentrations begin to favor cross-linking as processing time continues, resulting in increased M W . Therefore, lower peroxide concentrations are recommended for greater control over the extent of degradation. The resulting high MFI PLA can have applications that require low viscosity, such as melt-blown nonwoven materials where the treated sample was shown to produce finer, more uniform fibers at lower operating temperatures compared to raw PLA.

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Degradation behaviors and crystallization of rapidly degradable polylactic acid prepared by melting through coordination complexation reaction

Cited by 2 publications

References 48 publications

Study of polypropylene/polyethylene terephthalate blends compatibilized with polypropylene double‐grafted maleic anhydride and epoxy resin

Study of polypropylene/polyethylene terephthalate blends compatibilized with polypropylene double‐grafted maleic anhydride and epoxy resin

Hydrogen Peroxide-Induced Controlled Degradation of Poly(lactic acid) for Melt-Blown Nonwovens

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