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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Forming Micro-and Nano-Plastics from Agricultural Plastic Films for Employment in Fundamental Research Studies
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From Film Processing to Microphase Orientation: Structure-Property Relationships in Commercial PBSA/PLA Blend Films.

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Summary

Poly(butylene succinate-co-adipate) (PBSA) and poly(lactic acid) (PLA) blends were processed into films. Their properties were analyzed, showing versatile mechanical strength and flexibility suitable for various applications.

Keywords:
bioplasticblendconfocal Raman microscopyflexible filmprocessing

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Area of Science:

  • Polymer Science
  • Materials Science
  • Biomaterials

Background:

  • Poly(butylene succinate-co-adipate) (PBSA) is a biodegradable, biobased copolyester with growing commercial interest.
  • Understanding its processing and film properties is crucial for applications, especially in flexible films, either alone or in blends.

Purpose of the Study:

  • To investigate the processing, morphology, and mechanical properties of poly(butylene succinate-co-adipate) (PBSA) and poly(lactic acid) (PLA) blends.
  • To compare the characteristics of flat films and blown films made from these materials.

Main Methods:

  • Materials: PBSA, PLA, and three blend compositions.
  • Processing: Flat film extrusion and film blowing.
  • Characterization: X-ray diffraction (XRD), Confocal Raman Microscopy (CRM), Scanning Electron Microscopy (SEM), Tensile Testing, Differential Scanning Calorimetry (DSC), Dynamic Mechanical Analysis (DMA).

Main Results:

  • PBSA exhibited semicrystalline order, while PLA remained amorphous after processing.
  • CRM revealed lamellar-like domains in flat films due to stretching and cooling; blown films showed less orientation.
  • Tensile tests indicated a wide range of mechanical strength and flexibility for PBSA and its blends, exceeding polyolefins in some aspects but with reduced ductility.

Conclusions:

  • PBSA and its blends offer tunable mechanical properties for flexible film applications.
  • The processing method (flat vs. blown film) significantly influences material morphology and orientation.
  • Further research into thermal properties via DSC and DMA provides deeper material insights.