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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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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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Photopatternable Biodegradable Aliphatic Polyester with Pendent Benzophenone Groups.

Dayong Chen1, Chia-Chih Chang1, Beth Cooper1

  • 1Department of Polymer Science and Engineering, University of Massachusetts Amherst , 120 Governors Drive, Amherst, Massachusetts 01003, United States.

Biomacromolecules
|September 24, 2015
PubMed
Summary
This summary is machine-generated.

Researchers developed a photopatternable biodegradable polyester for creating self-folding biomaterials. This material enables UV-induced cross-linking and degradation-triggered unfolding, offering potential for advanced tissue engineering scaffolds.

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Tissue Engineering

Background:

  • Photo-cross-linking reactions are crucial for advanced biomaterial applications.
  • Biodegradable polymers with tunable properties are needed for medical devices and regenerative medicine.

Purpose of the Study:

  • To synthesize a photopatternable biodegradable aliphatic polyester.
  • To investigate its UV-induced cross-linking capabilities.
  • To fabricate and characterize self-folding structures for potential biomedical applications.

Main Methods:

  • Synthesis of a benzophenone-functionalized aliphatic polyester via copper-catalyzed alkyne-azide cycloaddition.
  • Photopatterning of the synthesized polyester using UV irradiation.
  • Fabrication of polyester/hydrogel bilayer structures for self-folding behavior.
  • Enzyme-catalyzed degradation studies using lipase.

Main Results:

  • Successfully synthesized a photopatternable biodegradable polyester.
  • Demonstrated UV-induced cross-linking to form stable photopatterned films.
  • Fabricated a multilayer construct that self-folds into a triangular tube upon hydrogel swelling.
  • Observed controlled unfolding of the structure via lipase-catalyzed polyester degradation.

Conclusions:

  • The developed photopatternable polyester allows for precise structural control in biomaterials.
  • The self-folding and unfolding capabilities highlight potential for dynamic 2D and 3D tissue engineering scaffolds.
  • This approach offers a versatile platform for designing responsive biomaterials for medical applications.