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Related Concept Videos

Bioplastics01:27

Bioplastics

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Bioplastics derived from microbial processes present a sustainable alternative to conventional petroleum-based plastics. Among these, polyhydroxyalkanoates (PHAs), particularly polyhydroxybutyrates (PHBs), have emerged as prominent candidates due to their biodegradability and biocompatibility. These polymers are synthesized by a variety of bacteria, such as Cupriavidus necator and Pseudomonas putida, which naturally accumulate PHAs as intracellular carbon and energy reserves, especially under...
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Polyethylene terephthalate (PET) is a synthetic polymer widely utilized in the packaging industry, particularly for bottles and containers. Due to its chemical stability and durability, PET accumulates in the environment, contributing significantly to plastic pollution. It comprises repeating units of terephthalic acid and ethylene glycol, resulting in a semi-crystalline structure that is resistant to natural degradation processes.A notable breakthrough in plastic biodegradation came with the...
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Mechanically Recycled PLA Films Reinforced with Rice Husk and Carbonized Rice Husk Particles.

Sergio Gonzalez-Serrud1,2,3, Ana Cristina González-Valoys2,4,5,6, Marina P Arrieta3,7,8

  • 1Departamento de Ciencias e Ingeniería de los Materiales, Facultad de Ingeniería Mecánica, Universidad Tecnológica de Panamá, Panama City 0819-07289, Panama.

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Summary
This summary is machine-generated.

Mechanically reprocessed poly(lactic acid) (rPLA) films with rice husk (RH) and rice husk biochar (RHB) show promising processing and functional properties. All composite films achieved complete disintegration within 21 days under composting conditions, supporting their use in the circular economy.

Keywords:
biocharbiocompositesmechanically reprocessed PLArice husk waste

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Area of Science:

  • Materials Science
  • Polymer Science
  • Sustainable Materials

Background:

  • Mechanical reprocessing of poly(lactic acid) (PLA) aims to valorize industrial waste.
  • Rice husk (RH) and rice husk biochar (RHB) are agro-industrial residues with potential as reinforcing fillers.
  • Understanding the impact of these fillers on rPLA properties is crucial for developing sustainable materials.

Purpose of the Study:

  • To investigate the processing behavior, functional properties, and disintegration of mechanically reprocessed PLA (rPLA) films reinforced with RH and RHB.
  • To evaluate the effects of RH and RHB incorporation on the melt flow, surface properties, and mechanical performance of rPLA.
  • To assess the compostability of the developed rPLA composite films.

Main Methods:

  • rPLA was prepared via mechanical reprocessing.
  • Composites with 1 and 3 wt.% RH or RHB (500 µm) were manufactured using melt extrusion and compression molding.
  • Processing behavior, intrinsic viscosity, molecular weight, surface properties (hydrophilicity/hydrophobicity), crystallinity, tensile properties, and disintegration under composting conditions were evaluated.

Main Results:

  • Mechanical reprocessing led to chain scission in rPLA.
  • RH increased surface hydrophilicity, while RHB increased hydrophobicity at low concentrations.
  • Both fillers acted as nucleating agents, with RHB increasing crystallinity. Tensile strength and stiffness were maintained, but ductility decreased.
  • All formulations demonstrated complete disintegration within 21 days in laboratory-scale composting.

Conclusions:

  • RH and RHB are viable fillers for valorizing agro-industrial residues in rPLA films.
  • The incorporation of RH and RHB allows tuning of structure-property relationships in rPLA.
  • The developed composite films are compostable, offering a sustainable alternative within the circular economy framework.