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Updated: May 12, 2026

Shape Memory Polymers for Active Cell Culture

Shape Memory Polymers for Active Cell Culture

Published on: July 4, 2011

Toughened polylactide-based shape memory materials fabricated via reactive blending.

Haochen Li¹, Xiang Zhang², Jingjing Wang²

¹School of Light industry Science and Engineering, Beijing Technology and Business University, Beijing 100048, PR China; National Engineering Research Center for Synthesis of Novel Rubber and Plastic Materials, SINOPEC (Beijing) Research Institute of Chemical Industry Co., Ltd. Yanshan Branch, Beijing, 102500, PR China.

International Journal of Biological Macromolecules

|October 22, 2025

Summary

Reactive blending of polylactide (PLA) and poly(ε-caprolactone) (PCL) using hexamethylene diisocyanate (HDI) and bis(2-hydroxyethyl) amino-tris(hydroxymethyl)methane (BTM) improved mechanical properties and shape memory behavior.

Keywords:

Poly(ε-caprolactone)Polylactide Reactive blending

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Area of Science:

Polymer Science
Materials Science
Biomaterials Engineering

Background:

Polylactide (PLA) and poly(ε-caprolactone) (PCL) are biodegradable polymers with complementary properties but poor miscibility.
Enhancing their compatibility is crucial for developing advanced materials with improved performance.

Purpose of the Study:

To improve the compatibility and mechanical properties of PLA/PCL blends through reactive blending.
To investigate the effects of hexamethylene diisocyanate (HDI) and bis(2-hydroxyethyl) amino-tris(hydroxymethyl)methane (BTM) on blend morphology and properties.
To explore the potential for shape memory behavior in the modified blends.

Main Methods:

Reactive blending of PLA and PCL in the presence of HDI and BTM.
Characterization of blend morphology using techniques like gel content analysis.
Evaluation of mechanical properties including tensile strength and elongation at break.
Assessment of shape memory behavior.

Main Results:

Reactive blending formed chain-extended polymers and PLA-co-PCL copolymers, creating a crosslinked network.
A sea-island morphology with PCL dispersed in a PLA matrix was observed.
Despite reduced crystallization, mechanical properties significantly improved, with one blend showing 441% elongation at break.
The blend with 2.0 wt% BTM exhibited an 85.4% shape recovery rate, indicating excellent shape memory.

Conclusions:

Reactive blending is an effective strategy to compatibilize PLA and PCL.
The addition of BTM promotes crosslinking and enhances mechanical properties and shape memory.
These high-performance PLA-based materials offer improved toughness and functionality for various applications.