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Polymers

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...

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Fully Conjugated Covalent Porous Polymers for Highly Efficient Solar-Thermal Conversion.

Liuliu Yang¹, Xianghong Niu^2,3, Shanshan Zhu¹

¹College of Chemistry, Jilin University, Changchun 130012, P.R. China.

|January 27, 2026

Summary

This summary is machine-generated.

New bipyranylidene-based microporous polymers offer efficient solar-thermal water evaporation. These durable photothermal materials achieve high water production rates from pure water and seawater using sunlight.

Keywords:

Bipyranylidene Photothermal Conversion Porous Organic Polymers Seawater Desalination Solar-Driven Water Evaporation

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Published on: September 12, 2014

Area of Science:

Materials Science
Chemical Engineering
Environmental Science

Background:

Solar-thermal water evaporation is a key technology for clean water production.
Developing efficient and stable photothermal conversion materials is crucial but challenging.

Purpose of the Study:

To synthesize and characterize novel bipyranylidene-based microporous polymers (DP-CMP1 and DP-CMP2) for solar-thermal water evaporation.
To evaluate the photothermal conversion efficiency, stability, and water production capabilities of these new materials.

Main Methods:

Synthesis of fully conjugated bipyranylidene-based microporous polymers (DP-CMP1 and DP-CMP2).
Photothermal performance testing using laser illumination and solar simulation.
Fabrication and testing of an interfacial heating evaporation system.
Spectroscopic and theoretical investigations to understand material properties.

Main Results:

DP-CMP1 exhibited rapid temperature increase from 29.1 to 174.7 °C under 660 nm laser illumination.
The evaporation system achieved high rates of 3.83 kg m^-2 h^-1 (pure water) and 3.77 kg m^-2 h^-1 (seawater) under 1 sun.
Excellent solar-to-vapor conversion efficiencies of 97.5% (pure water) and 96.6% (seawater) were recorded.
DP-CMP1 demonstrated broad light absorption, superior photothermal efficiency, and outstanding durability.

Conclusions:

DP-CMP1 and DP-CMP2 are effective photothermal materials for solar-thermal water evaporation.
The materials' performance is attributed to their small band gap, fast nonradiative recombination, large nonadiabatic coupling, and strong electron-phonon coupling.
These novel polymers represent a significant advancement in materials for clean water production via solar energy.