A Facile Strategy to Fabricate Multishape Memory Polymers with Controllable Mechanical Properties

Area of Science:

• Materials Science
• Polymer Chemistry
• Nanotechnology

Background:

• Multishape memory polymers (SMPs) offer advanced functionalities but often require complex fabrication.
• Existing methods for multi-SMPs can be intricate and costly, limiting their widespread adoption.

Purpose of the Study:

• To develop a facile and cost-effective strategy for fabricating multishape memory polymers (SMPs).
• To achieve quadruple shape memory effects using a single type of phase transition material.
• To demonstrate the tunability of mechanical and rheological properties in the fabricated SMPs.

Main Methods:

• Blending physically crosslinked polymers, specifically olefin block copolymer (OBC) and styrene-b-(ethylene-co-butylene)-b-styrene (SEBS), with crystalline paraffin.
• Investigating the phase behavior and melting transitions of paraffin within different polymer matrices.
• Characterizing the shape memory performance and mechanical properties of the resulting composites.

Main Results:

• Paraffin exhibited distinct melting transitions within OBC and SEBS matrices due to varied polymer-paraffin interactions.
• Composites containing paraffin within OBC showed dual melting transitions, enabling enhanced shape memory effects.
• A quadruple shape memory effect was achieved, utilizing up to three distinct melting transitions.
• Mechanical and rheological properties were effectively tuned by adjusting polymer composition.

Conclusions:

• A simple and controllable blending strategy can produce multishape memory polymers (SMPs) with multiple shape memory effects.
• This method utilizes inexpensive raw materials and offers a scalable approach for industrial applications.
• The findings pave the way for the broader application of multi-SMPs in diverse fields.