Optically active substituted polyacetylene@carbon nanotube hybrids: Preparation, characterization and infrared emissivity property study

2014 ◽  
Vol 216 ◽  
pp. 23-29 ◽  
Author(s):  
Xiaohai Bu ◽  
Yuming Zhou ◽  
Tao Zhang ◽  
Yongjuan Wang ◽  
Zewu Zhang ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Optically Active ◽  
Infrared Emissivity

Preparation and Infrared Emissivity Study of Optically Active Polyurethane/Multiwalled Carbon Nanotubes Nanocomposites

2012 ◽  
Vol 557-559 ◽  
pp. 362-365
Author(s):  
Jing Chen ◽  
Bing Xin Liu ◽  
Xiu Bi Chen ◽  
Li Xin Xue ◽  
Yu Ming Zhou
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
High Intensity ◽  
Optically Active ◽  
Interface Effect ◽  
Infrared Emissivity ◽  
High Intensity Ultrasound ◽  
Multiwalled Carbon ◽  
Sem And Tem

This paper described the preparation of optically active polyurethanes (BPUs)/multiwalled carbon nanotubes (MWCNTs) composites through the high-intensity ultrasound. SEM and TEM observations showed the homogeneous coating of MWCNTs by BPU. The infrared emissivity (8-14μm) study revealed that the composites possessed much lower infrared values compared with those of the polyurethanes and nanotubes, due to the special interface effect. The lowest infrared emissivity values of nanocomposites were S-BPU/MWCNTs εmin=0.461 and R-BPU/MWCNTs εmin=0.418, respectively.

Synthesis, helicity, and low infrared emissivity of optically active poly( N -propargylamide)s bearing stigmasteryl moieties

2017 ◽  
Vol 1142 ◽  
pp. 285-292 ◽  
Author(s):  
Wenlu Pan ◽  
Yuming Zhou ◽  
Man He ◽  
Xiaohai Bu ◽  
Binbin Ding ◽  
...  
Keyword(s):  
Optically Active ◽  
Infrared Emissivity

scholarly journals Preparation and Characterization of Optically Active Polyurethane from Rotatory Binaphthol Monomer and Polyurethane Prepolymer

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2986
Author(s):  
Ling Lin ◽  
Haiyan Mao ◽  
Ziyin Li ◽  
Wenyao Li ◽  
Chaoxia Wang
Keyword(s):  
Thermal Insulation ◽  
Waterborne Polyurethane ◽  
Structural Features ◽  
Optically Active ◽  
Structure Characterization ◽  
Optically Active Polymers ◽  
Infrared Emissivity ◽  
Monomer Content ◽  
Cooling Ability

Optically active polymers are promising multifunctional materials with great application potentials. Herein, environmentally friendly optically active polyurethanes (OPUs) were obtained by introducing rotatory binaphthol monomer to polyurethane. The influence of binaphthol monomer content on the structure, mechanical properties, infrared emissivity, and thermal insulation of OPUs was studied intensively. Structure characterization indicated that the optically active polyurethanes have been successfully synthesized. The OPU synthesized with BIMOL and BDO at the mole ratio of 1:1 presented better thermal resistance. In addition, OPUs showed enhanced tensile strength and stretchability with the increase of BINOL content to a certain extent due to its rigid structural features and high molecular weight. The optically active polyurethanes showed lower infrared emissivity values (8–14 μm) than waterborne polyurethane (WPU), and the infrared emissivity decreased from 0.850 to 0.572 as the content of the BINOL monomer increased. Moreover, OPU4 exhibited the best heat insulation and cooling ability with about a 7 °C temperature difference. The thus-synthesized optically active polyurethanes provide an effective solution for developing highly effective thermal insulation materials.

Preparation of Helical Monosubstituted Polyacetylene@CdSe Quantum Dots Composite and its Application for Low Infrared Emissivity

2014 ◽  
Vol 1044-1045 ◽  
pp. 88-91
Author(s):  
Xiao Hai Bu ◽  
Yu Ming Zhou ◽  
Man He ◽  
Tao Zhang ◽  
Hu Chuan Wang
Keyword(s):  
Quantum Dots ◽  
Optically Active ◽  
Helical Conformation ◽  
Cdse Quantum Dots ◽  
Infrared Emissivity ◽  
X Ray Diffraction ◽  
Cdse Qds ◽  
Transmission Electron ◽  
Ft Ir ◽  
Ester Linkage

Helical monosubstituted polyacetylene@CdSe quantum dots (HPA@CdSe QDs) nanocomposites were fabricated by grafting helical HPA polymers onto the surface of semiconductor QDs through ester linkage. Optically active HPA derived from chiral serine was polymerized by a rhodium zwitterion catalyst, and evidently proved to adopt a predominately single-handed helical conformation. The HPA@QDs nanocomposites were characterized by Fourier-transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). The results indicate that the HPA matrix exhibits an enhancement in thermal stability after hybridization with CdSe QDs, while the QDs can maintain their original crystalline structure during the grafting process. The infrared emissivity property of the HPA@QDs nanocomposites at 8-14 μm was further investigated. These data demonstrated that the HPA@QDs composite film with doped CdSe QDs possesses an infrared emissivity value of 0.393, which was much lower than pristine HPA and QDs. This might be attributed to the incorporation of optically active helical HPA and semiconductor QDs in a hybrid phase and their strengthened interfacial interaction.

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