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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold

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Published on: October 23, 2015

Bio-based, biodegradable and amorphous polyurethanes with shape memory behavior at body temperature.

Hui-Min Dou^1,2, Ji-Heng Ding², Hao Chen²

¹College of Materials Science and Engineering, Shanghai University Shanghai 200072 China.

|May 6, 2022

Summary

This summary is machine-generated.

New bio-based shape memory polyurethanes (bio-PUs) were developed using polylactide and polycaprolactone diols. These materials exhibit tunable properties and excellent shape recovery near body temperature, making them suitable for biomedical devices.

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Published on: April 16, 2018

Area of Science:

Polymer Chemistry
Biomaterials Science
Materials Engineering

Background:

Shape memory polymers (SMPs) offer dynamic shape-changing capabilities.
Bio-based and biodegradable polymers are increasingly sought for sustainable applications.
Developing SMPs with properties tailored for biomedical applications remains a key challenge.

Purpose of the Study:

To synthesize and characterize novel bio-based, biodegradable, amorphous shape memory polyurethanes (bio-PUs).
To investigate the influence of polylactide (PLA) to polycaprolactone (PCL) diol ratios on the thermal and mechanical properties of the synthesized bio-PUs.
To evaluate the shape memory performance of these bio-PUs, particularly at body temperature, for potential biomedical applications.

Main Methods:

Two-step pre-polymerization synthesis using PLA diol, PCL diol, and diphenylmethane diisocyanate-50 (MDI-50).
Adjustment of PLA/PCL diol ratios to tune material properties.
Characterization of thermal properties (glass transition temperature, T_g) and mechanical properties (tensile strength, elongation).
Shape memory behavior testing at body temperature (37 °C).

Main Results:

Synthesized amorphous bio-PUs with tunable glass transition temperatures (T_g) ranging from -10.7 °C to 32.5 °C, adjustable near body temperature.
Achieved tunable tensile strength (1.7–12.9 MPa) and elongation (767.5%–1345.7%).
Demonstrated excellent shape memory behavior at body temperature, with one formulation (2:1 PLA/PCL ratio) showing over 98% shape recovery in 15 seconds at 37 °C.

Conclusions:

The developed bio-based shape memory polyurethanes possess tunable thermal and mechanical properties.
These bio-PUs exhibit promising shape memory performance, especially near body temperature.
The synthesized materials are highly suitable for advanced applications in smart biomedical devices.