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Related Concept Videos

Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
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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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Bioplastics

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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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...

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Film Extrusion of Crambe abyssinica/Wheat Gluten Blends
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Film Extrusion of Crambe abyssinica/Wheat Gluten Blends

Published on: January 17, 2017

High performance polyethylene/thermoplastic starch blends through controlled emulsification phenomena.

Claire Cerclé1, Pierre Sarazin, Basil D Favis

  • 1CREPEC, Department of Chemical Engineering, Ecole Polytechnique de Montréal, 2900 Edouard Montpetit, PO 6079, Station Centre-Ville, Montréal, Qc, H3C 3A7, Canada.

Carbohydrate Polymers
|December 11, 2012
PubMed
Summary
This summary is machine-generated.

New compatibilizers significantly enhance polyethylene/thermoplastic starch blends, improving mechanical properties like elongation and impact strength. These advanced materials offer performance comparable to pure polyethylene.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Composite Materials

Background:

  • Polyethylene/thermoplastic starch (PE/TPS) blends are promising for various applications.
  • Improving the interfacial adhesion and mechanical properties of PE/TPS blends is crucial for their wider adoption.
  • Compatibilizers play a key role in achieving desired blend morphologies and performance.

Purpose of the Study:

  • To investigate the emulsification efficacy of various compatibilizers for PE/TPS blends.
  • To conduct a detailed morphological and mechanical analysis of the compatibilized blends.
  • To establish correlations between blend morphology, compatibilizer concentration, and mechanical properties.

Main Methods:

  • Synthesis and characterization of polyethylene-maleic anhydride terpolymers with elastomeric segments.
  • Preparation and morphological analysis (volume and number average diameter) of PE/TPS blends using different compatibilizers.
  • Mechanical testing, including elongation at break and notched impact strength, of the compatibilized blends.

Main Results:

  • Polyethylene-maleic anhydride terpolymers with elastomeric segments demonstrated excellent emulsification of PE/TPS blends.
  • The compatibilized blends exhibited a fine morphology with a volume diameter of 1.4 μm and number average diameter of 600 nm.
  • The blends showed a very high elongation at break (approx. 800%) and significantly improved notched impact strength, reaching performance levels equivalent to pure polyethylene.

Conclusions:

  • Compatibilizers, particularly polyethylene-maleic anhydride terpolymers with elastomeric segments, are highly effective in improving PE/TPS blend morphology and mechanical performance.
  • The study highlights the critical role of morphology in determining the mechanical properties of PE/TPS blends.
  • The developed compatibilized PE/TPS systems offer a promising route to high-performance, sustainable materials.