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Related Concept Videos

Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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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...
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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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Microbial Bioremediation of Plastics01:28

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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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Polymer Classification: Architecture01:14

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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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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Phosphodiester bond forms when a phosphoric acid molecule (H3PO4) links with two hydroxyl groups (–OH) of two other molecules, forming two ester bonds. Two water molecules are released in this process. The phosphodiester bond is commonly found in nucleic acids (DNA and RNA) and plays a critical role in their structure and function.
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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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Improving the miscibility of biodegradable polyester/polyphosphazene blends using cross-linkable polyphosphazene.

Dingying Shan1, Zhaohui Huang, Yuchen Zhao

  • 1Beijing Laboratory of Biomedical Materials, College of Material Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China.

Biomedical Materials (Bristol, England)
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Summary

This study developed novel biodegradable polyester/polyphosphazene composites for bone regeneration. Photo-crosslinking prevented phase separation, significantly improving mechanical properties for enhanced tissue engineering applications.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Tissue Engineering

Background:

  • Biodegradable polyesters and polyphosphazenes are key biomaterials for tissue regeneration.
  • Combining these materials offers enhanced biocompatibility and osteocompatibility.
  • Phase separation has limited the application of polyester/polyphosphazene composites.

Purpose of the Study:

  • To synthesize a cross-linkable polyphosphazene, PGHP.
  • To create and evaluate PLLA/PGHP and PLGA/PGHP composites.
  • To overcome phase separation issues in polyester/polyphosphazene blends for bone regeneration.

Main Methods:

  • Synthesized cross-linkable poly(glycine ethyl ester-co-hydroxyethyl methacrylate)phosphazene (PGHP).
  • Blended PGHP with poly(L-lactide) (PLLA) or poly(L-lactide-co-glycolide) (PLGA) using chloroform.
  • Photo-crosslinked the blends before solvent removal.

Main Results:

  • The crosslinked PLLA/PGHP and PLGA/PGHP composites exhibited no significant phase separation.
  • The crosslinked PGHP network restricted phase separation.
  • Mechanical properties of the crosslinked composites were significantly improved compared to uncrosslinked blends.

Conclusions:

  • The developed crosslinked composites effectively prevent phase separation.
  • These materials show great potential for bone regeneration applications.
  • The improved mechanical properties are crucial for successful tissue engineering scaffolds.