Control of Properties through Hydrogen Bonding Interactions in Conjugated Polymers

Abstract

Molecular design is crucial for endowing conjugated polymers (CPs) with unique properties and enhanced electronic performance. Introducing Hydrogen‐bonding (H‐bonding) into CPs has been a broadly exploited, yet still emerging strategy capable of tuning a range of properties encompassing solubility, crystallinity, electronic properties, solid‐state morphology, and stability, as well as mechanical properties and self‐healing properties. Different H‐bonding groups can be utilized to tailor CPs properties based on the applications of interest. This review provides an overview of classes of H‐bonding CPs (assorted by the different H‐bond functional groups), the synthetic methods to introduce the corresponding H‐bond functional groups and the impact of H‐bonding in CPs on corresponding electronic and materials properties. Recent advances in addressing the trade‐off between electronic performance and mechanical durability are also highlighted. Furthermore, insights into future directions and prospects for H‐bonded CPs are discussed.

Hydrogen-bonded polyazomethines for efficient organic solar cells

“…These intramolecular hydrogen bonds which occur in a six-membered, π-conjugated ring (NC–CC–N–H) are typical resonance assisted hydrogen bonds (RAHBs). 36–41 With the influence of the π-electron delocalization, the RAHBs are stronger than normal hydrogen bonds and have partial covalent characters. The six membered quasi aromatic rings which formed by the RAHBs could lock thiophene rings and azomethine moieties into near coplanar conformations.…”

Position Matters: Pyridine Regioisomers Influence Secondary Structure and Micelle Morphology in Polymer-Homopolypeptide Micelles

“…The degree of crystallinity ( X c ) of the PEG block was calculated by comparing the enthalpy of crystallization (Δ H cryst ) of the copolymers to that of 100% crystalline PEG (Table S2). The PEG block was found to be significantly less crystalline in PEG- b -PBG ( X c = 38%) when compared to the PEG- b -PMG copolymers ( X c = 58–63%), which may result from the pyridyl groups eliciting stronger intermolecular interactions (i.e., H-bonds), leading to a more ordered structure that influences crystallization of the PEG component. , Alternatively, the higher DP of the polypeptide block in the PEG- b -PBG copolymer may act to depress the T cryst and X c of the PEG block as has been observed for other block copolymers . For example, PEG crystallization in PBG–PEG–PBG triblock copolymers is significantly influenced by the DP of the polypeptide block, with longer polypeptide blocks inhibiting PEG crystallization .…”

Preparation and application of rosin@apatite hybrid material with new natural surfactants based on in-situ reaction by sol-gel method

“…Figure 7 shows that DOX loading of (A) and (B) is 454 mg g −1 and 492 mg g −1 , respectively, and encapsulation efficiency is 94% and 92%, respectively, which is much higher than the maximum drug loading of DOX synthesized by hydrothermal method at high temperature (148.230 mg g −1 ) [16]. The reason for the results may be that in addition to the electrostatic and hydrogen bonding forces between the material and DOX, π-π conjugation can be formed between the benzene ring structure of rosin group and DOX [47]. And the organic content of (A) and (B) is 19.9% and 47.5% respectively at the medium and low temperature, which enhanced the π-π conjugation, and the DOX loading of the hybrid material is greatly increased.…”