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pH-Programmable Sequential Dissolution of Multilayer Stacks of Hydrogen-Bonded Polymers.

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¹Department of Chemical Engineering and ‡Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

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|May 24, 2022

Summary

The stacking order of polymer layers in hydrogen-bonded films controls polymer diffusion and release. This allows for sequential pH-programmed release and the creation of freestanding films with tunable thickness.

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Area of Science:

Polymer Science
Materials Science
Nanotechnology

Background:

Hydrogen-bonded multilayer films offer tunable properties for advanced applications.
Controlling interlayer diffusion is crucial for designing functional thin films.
Understanding polymer chain dynamics in heterostructures is key to material design.

Purpose of the Study:

To investigate the influence of stacking order on polymer chain diffusion in heterostructured hydrogen-bonded multilayer films.
To demonstrate pH-programmed sequential release by controlling film architecture.
To generate multifunctional freestanding films with tunable thickness.

Main Methods:

Fabrication of heterostructured hydrogen-bonded multilayer films with varying stacking sequences.
Analysis of interlayer polymer diffusion based on pH stability of polymer pairs.
Tuning film release from substrate via stacking sequence manipulation.
Generation of freestanding films through thermal cross-linking.

Main Results:

Polymer diffusion is significantly influenced by the stacking order, with higher diffusion observed when high pH stability polymers are layered on top of low pH stability polymers.
Sequential pH-programmed release of the multilayer film can be achieved by precisely controlling the stacking sequence.
Multifunctional freestanding films with adjustable thickness were successfully generated via controlled stacking and thermal cross-linking.

Conclusions:

The stacking order is a critical parameter for controlling polymer diffusion and release in hydrogen-bonded multilayer films.
This study presents a method for creating pH-responsive materials with sequential release capabilities.
The findings enable the development of advanced freestanding polymer films for diverse applications.