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Related Concept Videos

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
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Related Experiment Video

Updated: Jun 18, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Published on: September 26, 2016

Spectroscopic study on water diffusion in poly(ester urethane) block copolymer matrix.

Wei Wang1, Ying Jin, Zhaohui Su

  • 1State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, and Graduate School of Chinese Academy of Sciences, Chinese Academy of Sciences, Changchun, 130022, PR China.

The Journal of Physical Chemistry. B
|November 10, 2009
PubMed
Summary
This summary is machine-generated.

Water diffusion in biodegradable poly(ester urethane) shape-memory polymers was studied. Water preferentially interacts with soft poly(epsilon-caprolactone) segments before binding to hard urethane domains.

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Area of Science:

  • Polymer Science
  • Materials Science
  • Physical Chemistry

Background:

  • Biodegradable poly(ester urethane) shape-memory polymers are advanced materials with tunable properties.
  • Understanding water diffusion is crucial for predicting polymer performance and degradation in biological environments.

Purpose of the Study:

  • To investigate the diffusion pathways and hydrogen bonding interactions of water within a phase-separated biodegradable poly(ester urethane) shape-memory polymer.
  • To elucidate the sequential interaction of water with soft (poly(epsilon-caprolactone)) and hard (urethane) segments.

Main Methods:

  • Time-resolved FTIR-ATR spectroscopy was employed to monitor water diffusion in real-time.
  • Spectral band fitting and two-dimensional correlation analyses were used to interpret water-polymer interactions.

Main Results:

  • The broad water band (3800-2800 cm(-1)) was deconvoluted into four distinct bands, indicating different hydrogen bonding environments.
  • Water initially diffuses into the poly(epsilon-caprolactone) soft segments, forming hydrogen bonds with C=O groups.
  • Subsequently, water interacts with urethane hard segments, forming bridge and double hydrogen bonds.

Conclusions:

  • Water diffusion in these polymers is a multi-step process involving sequential interactions with different polymer phases.
  • The specific hydrogen bonding patterns provide insights into the polymer's response to moisture and its potential applications.