Preparation of Thermo- and pH-Responsive Microgels Based on Complementary Nucleobase Molecular Recognition

Area of Science:

• Biomimetic materials science
• Supramolecular chemistry
• Polymer science

Background:

• Nucleobase complementarity is crucial for biomolecular recognition.
• Integrating supramolecular noncovalent interactions into stimuli-responsive microgels remains a challenge.
• Biomimetic materials require advanced structural features for sophisticated functions.

Purpose of the Study:

• To develop novel stimuli-responsive microgels using nucleobase pairing.
• To investigate the self-assembly and responsive behaviors of these biomimetic microgels.
• To explore potential applications in controlled release and soft matter technologies.

Main Methods:

• Synthesis of bis-thymine end-decorated flexible poly(N-isopropyl acrylamide) (T-PNIPAM-T) via RAFT polymerization.
• Preparation of a rigid poly[1-(4-vinyl benzyl)] adenine (P_SA) backbone with pendant adenines.
• Construction of supramolecular cross-linked 3D networks through thymine-adenine base pairing.
• Self-assembly of networks into microgels influenced by hydrophilicity and block flexibility.

Main Results:

• Successfully formed supramolecular 3D networks and microgels via nucleobase pairing.
• Demonstrated volumetric shrinkage of microgels in varying water content.
• Observed stimuli-responsive assembly behavior under thermal and pH conditions.
• Highlighted the biomimetic approach for creating functional soft matter.

Conclusions:

• The study successfully demonstrates the creation of stimuli-responsive microgels using nucleobase complementarity.
• These biomimetic microgels exhibit tunable properties and responsive behaviors.
• The findings hold significant potential for advancing controlled release systems and soft matter applications.