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Bulk Modulus01:21

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The bulk modulus is a scientific term used to describe a material's resistance to uniform compression. It is the proportionality constant that links a change in pressure to the resulting relative volume change.
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Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
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Zwitterionic Polyurethanes with Tunable Surface and Bulk Properties.

Huifeng Wang1, Yang Hu1, Dylan Lynch1

  • 1Department of Chemical Engineering , University of Illinois at Chicago , Chicago , Illinois 60607 , United States.

ACS Applied Materials & Interfaces
|October 19, 2018
PubMed
Summary
This summary is machine-generated.

A new zwitterionic poly(carboxybetaine urethane) (PCBHU) was developed to improve polyurethane (PU) blood compatibility. This novel material exhibits excellent antifouling properties and tunable mechanical characteristics for advanced biomedical uses.

Keywords:
antifouling surfacecarboxybetainedual functionelastomerpolyurethanezwitterionic

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Surface Chemistry

Background:

  • Polyurethanes (PUs) often lack sufficient blood compatibility and antifouling properties for biomedical applications.
  • Existing PUs can be limited by issues like calcification and poor surface performance.

Purpose of the Study:

  • To develop a novel zwitterionic poly(carboxybetaine urethane) (PCBHU) platform.
  • To enhance antifouling properties and achieve tunable mechanical characteristics in PUs.
  • To provide a potential replacement for current PUs in demanding biomedical applications.

Main Methods:

  • Synthesis of PCBHU via condensation polymerization of diisocyanate with carboxybetaine (CB)-based triols.
  • Postpolymerization hydrolysis to generate zwitterionic CB functional groups at the interface.
  • Characterization using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC).

Main Results:

  • PCBHU demonstrated high thermal stability with degradation temperatures up to 305 °C.
  • Zwitterionic CB groups provided superior antifouling properties due to enhanced hydration.
  • Mechanical properties and water uptake were tunable by adjusting CB-based triol cross-linkers.

Conclusions:

  • PCBHU offers a promising strategy for incorporating zwitterionic functionalities into PUs.
  • The material exhibits superior antifouling properties compared to existing PUs.
  • PCBHU shows potential for challenging biomedical applications due to its balanced properties and cost-effectiveness.