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Related Concept Videos

Bioplastics01:27

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...
Microbial Bioremediation of Plastics01:28

Microbial Bioremediation of Plastics

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...
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...
Classification and Mechanical Properties of Synthetic Polymers01:28

Classification and Mechanical Properties of Synthetic Polymers

Synthetic polymers are classified as elastomers, fibers, or plastics based on their crystallinity. Crystallinity, the degree of long-range order in the solid state, influences the mechanical properties (stretching or contracting) of elastomers. Elastomers are flexible polymers that can expand or contract easily upon the application of an external force. They have numerous crosslinks that pull them back into their original shape when stress is removed. Silicones, for instance, are highly elastic...
Polymer Classification: Stereospecificity01:26

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...

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Published on: October 23, 2015

Spore-Based Biocomposite Thermoplastic Polyesters with Enhanced Toughness and Programmable Disintegration.

Han Sol Kim, Emily Fan, Arthi Chandra

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    This summary is machine-generated.

    This study integrates living bacterial spores into thermoplastic polyesters like PCL and PLA, creating advanced bio-based materials. These engineered living materials show enhanced mechanical properties and faster degradation, advancing sustainable polymer solutions.

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    Area of Science:

    • Materials Science
    • Biotechnology
    • Polymer Chemistry

    Background:

    • Thermoplastic polyesters are versatile materials with growing importance in sustainable applications.
    • Integrating biological components offers a novel approach to enhance polymer performance and end-of-life properties.
    • Engineered living materials (ELMs) represent a new frontier in smart and responsive materials.

    Purpose of the Study:

    • To generalize the embedded spore-based ELM concept to common thermoplastic polyesters.
    • To investigate the impact of incorporating heat-shock-tolerized Bacillus subtilis spores into polycaprolactone (PCL), polylactic acid (PLA), and poly(butylene adipate-co-terephthalate) (PBAT).
    • To evaluate the mechanical properties, spore viability, end-of-life behavior, and 3D printability of these novel biocomposite polyesters.

    Main Methods:

    • Compounding heat-shock-tolerized Bacillus subtilis spores with PCL, PLA, and PBAT using hot melt extrusion.
    • Assessing spore viability post-extrusion.
    • Evaluating mechanical performance, including toughness.
    • Conducting microbially-limited composting tests to determine degradation rates.
    • Demonstrating 3D printing capabilities using fused deposition modeling and direct ink writing.

    Main Results:

    • High spore viability (>90%) was maintained after hot melt extrusion in all tested polyesters.
    • Biocomposite polyesters exhibited improved mechanical properties, with up to a 41% increase in toughness.
    • Spore-containing PCL showed significantly accelerated degradation in composting, with nearly complete disintegration in five months (approx. 7-fold increase).
    • Successful 3D printing of biocomposite PCL was achieved.

    Conclusions:

    • The embedded spore-based ELM concept is successfully extended to multiple thermoplastic polyesters (PCL, PLA, PBAT).
    • These biocomposite materials offer enhanced mechanical performance and improved biodegradability.
    • This research paves the way for developing next-generation sustainable and functional materials through bio-integration.