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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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Polymer Classification: Stereospecificity

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...
Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...

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Related Experiment Video

Updated: May 14, 2026

Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers
10:09

Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers

Published on: June 30, 2018

Designing Soft and Transparent Films Based on Multi-Phase Polypropylene Copolymers and Styrene Block Copolymers.

Markus Gahleitner1, Dietrich Gloger1, Katja Klimke1

  • 1Borealis Polyolefine GmbH, St. Peterstr. 25, 4021 Linz, Austria.

Polymers
|May 13, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed new polyolefin-based blends as alternatives to plasticized poly (vinyl chloride) (PVC) for medical packaging. These blends offer a promising combination of flexibility, durability, and transparency, addressing environmental and health concerns associated with PVC.

Keywords:
filmmechanicsmedical applicationsmorphologyopticspolypropylenestyrene elastomers

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Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications
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Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications

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Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications
09:22

Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications

Published on: August 28, 2015

Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomedical Engineering

Background:

  • Plasticized poly (vinyl chloride) (PVC) faces scrutiny due to environmental and health concerns, including plasticizer loss and microplastic formation.
  • A need exists for safer, alternative packaging materials in the medical and pharmaceutical sectors.
  • Polyolefin-based materials offer potential as substitutes for PVC in sensitive applications.

Purpose of the Study:

  • To investigate the potential of blending polypropylene-ethylene copolymers with styrene-ethylene/butylene-styrene block copolymer (SEBS) as an alternative to PVC.
  • To evaluate the mechanical properties, flexibility, durability, and transparency of these novel blends for medical packaging.
  • To determine the optimal SEBS content for achieving desired characteristics in different copolymer matrices.

Main Methods:

  • Blending of polypropylene-ethylene copolymers (RAHECO, RACO, HECO) with varying ethylene content and SEBS.
  • Injection molding of samples and casting of films for property evaluation.
  • Characterization of mechanical properties (flexural modulus), toughness, and optical properties (transparency).
  • Morphological analysis of film structures to understand phase behavior.

Main Results:

  • Blends of SEBS with random-heterophasic (RAHECO) copolymers achieved desired flexibility (150-250 MPa flexural modulus) with lower SEBS content (15-25 wt.-%) compared to single-phase random copolymers (RACO) (37 wt.-%).
  • RAHECO blends demonstrated superior toughness and excellent transparency.
  • Standard impact copolymers (HECO) required higher SEBS content (45 wt.-%) due to their more crystalline matrix.
  • Morphological studies revealed phase structure changes and potential phase inversion at high SEBS concentrations without compromising transparency.

Conclusions:

  • Polyolefin-based blends, particularly those using RAHECO copolymers with SEBS, present a viable alternative to plasticized PVC for soft medical packaging.
  • These materials offer a tunable balance of flexibility, toughness, and transparency essential for applications like infusion pouches and bottles.
  • The study highlights the importance of copolymer structure and SEBS content in tailoring material performance for specific medical packaging requirements.