scholarly journals One-step formation of infrared reflection microsheets via local photo-induced in situ polymerization

RSC Advances ◽  
2019 ◽  
Vol 9 (52) ◽  
pp. 30503-30508
Author(s):  
Jingxing Zhang ◽  
Zekun Guo ◽  
Yancong Feng ◽  
Yao Wang ◽  
Hao Li ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Energy Saving ◽  
Building Materials ◽  
In Situ Polymerization ◽  
Intelligent Building ◽  
Smart Windows ◽  
Infrared Reflection ◽  
One Step

Liquid crystal (LC) smart windows with adjustable reflectivity have been gradually applied in green and intelligent building materials for energy saving needs, but their applications are limited by their fundamental defects.

Self-Regulation of Infrared Using a Liquid Crystal Mixture Doped with Push–Pull Azobenzene for Energy-Saving Smart Windows

2021 ◽  
Vol 13 (4) ◽  
pp. 5028-5033
Author(s):  
Seung-Won Oh ◽  
Seung-Min Nam ◽  
Sang-Hyeok Kim ◽  
Tae-Hoon Yoon ◽  
Wook Sung Kim
Keyword(s):  
Liquid Crystal ◽  
Energy Saving ◽  
Self Regulation ◽  
Smart Windows ◽  
Crystal Mixture

scholarly journals Flame-Retardant and Smoke Suppression Properties of Nano MgAl-LDH Coating on Bamboo Prepared by an In Situ Reaction

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Xiaoling Yao ◽  
Chungui Du ◽  
Yating Hua ◽  
Jingjing Zhang ◽  
Rui Peng ◽  
...  
Keyword(s):  
Reaction Time ◽  
Flame Retardant ◽  
Building Materials ◽  
Reaction Times ◽  
Step Method ◽  
In Situ Reaction ◽  
One Step ◽  
Double Hydroxide ◽  
Optimal Reaction

In recent years, bamboo has been widely used for building materials and household goods. However, bamboo is flammable, so a flame-retardant treatment for bamboo is urgently needed. In this work, nano MgAl-layered double hydroxide (MgAl-LDH) coated on bamboo, which was called MgAl-LB, was synthesized by an in situ one-step method. To determine the optimal in situ time, the effects of different reaction times on LDH growth on the bamboo surface and the flame retardancy of the MgAl-LBs were investigated. The SEM observations show that LDH growth on the surface of bamboo was basically saturated when the in situ reaction time was 24 h. Abrasion experiments show that MgAl-LDH coating has good abrasion resistance. The fire performance of the MgAl-LBs was evaluated by cone calorimeter tests, which indicated that the THR and TSP of the MgAl-LBs were significantly lower than those of untreated bamboo. Taking into account the energy consumption problem, determining the reaction time of 24 h is the optimal reaction time. Compared with untreated bamboo, the THR and TSP of MgAl-LB prepared at 24 h decreased by 33.3% and 88.9%, respectively.

scholarly journals Functionality of TERGO Powders during the Synthesis of PANI-Based Composites for Electrical Devices

2019 ◽  
Vol 2019 ◽  
pp. 1-17
Author(s):  
M. A. Domínguez-Crespo ◽  
A. B. López-Oyama ◽  
A. M. Torres-Huerta ◽  
A. R. Hernández-Basilio ◽  
D. Palma-Ramírez ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Fine Particles ◽  
In Situ Polymerization ◽  
Hybrid Composites ◽  
Physical Interaction ◽  
Step Potential ◽  
Transmission Electron ◽  
Electrochemically Reduced Graphene Oxide ◽  
One Step

In this work, hybrid composites were prepared using polyaniline (PANI) and electrochemically reduced graphene oxide (ERGO) by in situ polymerization. ERGO powders were obtained by a two-way route, Hummer’s method, and one-step potential (−2 V) followed by annealing process at 400°C (TERGO powders): different quantities of TERGO fine particles (10, 20, and 30 wt%) were added to the in situ PANI polymerization in order to produce the hybrid composites. The morphology and structure of the PANI/TERGO compounds were characterized by Raman spectroscopy, ultraviolet-visible spectroscopy (UV-Vis), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Thermal treatment of ERGO powders pointed out high-defect surfaces with a wrinkle-type morphology (ID/IG ratio~0.90). The emeraldine phase of PANI was obtained with a maximum value of 61%, which decreases with the amount of TERGO powders. It is also seen that composites displayed a combined morphology between PANI matrix and TERGO powders, confirming a physical interaction between both morphologies. The amount of TERGO particles into the polymeric matrix also modifies the sample microstructure from a semispherical shape to extend sheets, where PANI is sandwiched between TERGO layers. Electrical conductivity of composites slightly increases independent of the TERGO amount (30 S/m and 39 S/m) due to the rough TERGO surface that conditioned the homogeneous nucleation of a large amount of polymer (PANI) reducing the area to move the electrical charge.

An editable shape-memory transparent wood for smart building materials

2020 ◽  
Author(s):  
Kaili Wang ◽  
Xiaorong Liu ◽  
Youming Dong ◽  
Zhe Ling ◽  
Jianzhang Li
Keyword(s):  
Shape Memory ◽  
Building Material ◽  
Building Materials ◽  
In Situ Polymerization ◽  
High Strength ◽  
Great Promise ◽  
Thermal Stimulus ◽  
Intelligent Building ◽  
Smart Building ◽  
Management Capability

Abstract Transparent wood (TW) with excellent optical and thermal management performance has been developed recently as a promising energy-efficient building material. Here, an editable shape-memory TW (ESMTW) is developed through in situ polymerization of epoxy vitrimers into a delignified wood scaffold. The ESMTW possesses high strength at low temperature and flexibility at high temperature, while it exhibits excellent shape-manipulation capability under thermal-stimulus. Meanwhile, the ESMTW shows unique light guiding and directional scattering effects. The light illuminance difference observed in our house model with a common glass ceiling is 81 times, whereas it is only 16 times with a ceiling made of the ESMTW. Most importantly, the transmitted light intensity distribution is tunable owing to its shape-management capability. Additionally, the resultant TW possesses great thermal insulation properties, mechanical strength, and high impact absorption ability. The combination of characteristics enables TW to exhibit great promise as an advanced functional and intelligent building material.

Preparation of Epoxy Resin/Montmorillonite Composites by Monomer Insert In Situ Polymerization

2010 ◽  
Vol 178 ◽  
pp. 236-241
Author(s):  
Jing Xie ◽  
Shang Yue Shen ◽  
Yu Xia Luo ◽  
Meng Meng Zhang ◽  
Ying Chen
Keyword(s):  
Tensile Strength ◽  
Glass Transition ◽  
Transition Temperature ◽  
Epoxy Resin ◽  
In Situ Polymerization ◽  
Raw Materials ◽  
One Step ◽  
Polymerization Method ◽  
Intercalative Polymerization

Epoxy resin/ montmorillonite (EP/MMT) composite was prepared via monomer insert in-situ polymerization. It was shown that the EP/MMT composites could be successfully synthesized from the raw materials only by one step, making it simpler than traditional in-situ intercalative polymerization method. The d001 spacing of montmorillonite was tested by XRD and increased to 4.30nm. The results showed that tensile strength and impact strength were improved by 98.11 and 93.69%, respectively. The glass transition temperature was increased by 17.3 °C.

A novel soft matter composite material for energy-saving smart windows: from preparation to device application

2015 ◽  
Vol 3 (20) ◽  
pp. 10738-10746 ◽  
Author(s):  
Yanzi Gao ◽  
Wenhuan Yao ◽  
Jian Sun ◽  
Huimin Zhang ◽  
Zhendong Wang ◽  
...  
Keyword(s):  
Composite Material ◽  
Liquid Crystal ◽  
Energy Conservation ◽  
Composite Film ◽  
Energy Saving ◽  
Vinyl Acetate ◽  
Soft Matter ◽  
Ethylene Vinyl Acetate ◽  
Smart Windows ◽  
Conservation Efficiency

A novel soft-matter composite film of ethylene-vinyl acetate and liquid crystal with an energy conservation efficiency of 40.4% is developed.

Application of the Intelligent Building Materials in the Green Energy-Saving Buildings

2014 ◽  
Vol 539 ◽  
pp. 721-725
Author(s):  
Yan Min Zhang ◽  
Zong Liang Yang
Keyword(s):  
Energy Saving ◽  
Building Materials ◽  
Green Energy ◽  
Intelligent Building ◽  
Intelligent Buildings

In this paper, the author points out the deficiency and a deviation of the construction of the present intelligent buildings, puts forward the extension and connotation of the intelligent buildings, further discusses the intelligent building materials as a means, and specifically summarizes the forms of a variety of intelligent building materials, such as the concrete, paint, glass and other aspects.

scholarly journals Modification of Leather Split by In Situ Polymerization of Acrylates

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Weixing Xu ◽  
Jianfei Zhou ◽  
Ya’nan Wang ◽  
Bi Shi
Keyword(s):  
In Situ Polymerization ◽  
Ester Group ◽  
Utility Value ◽  
Straight Chain ◽  
Elongation At Break ◽  
Structures And Properties ◽  
One Step ◽  
Mechanical Strengths ◽  
Chain Ester

Leather split, the byproduct of leather manufacture, possesses low utility value because it has loose weave of collagen fibers and weak mechanical strengths. Herein, a practical and convenient method for increasing strengths of leather split was developed by one-step in situ polymerization. The structures and properties of polyacrylate/leather split composites were systematically investigated. The results suggested the monomers with an α-methyl and a proper straight-chain ester group, such as nBMA, can effectively modify the leather split. For leather split with a thickness of 1.6 mm, the rational processes for preparation of polyacrylate/leather split composite are that monomer and split were stirred in a drum for 4 hours for full permeation and then the split was heated in anaerobic condition at 45°C for 30 min. The tensile strength, tear strength, and elongation at break of the optimized PnBMA/split composite were 18.72 MPa, 62.73 N/mm, and 46.02%, respectively. With these mechanical properties, the split after modification can be well used as leather for making shoes, bags, gloves, and clothing.

Chemical modification of banana starch by the in situ polymerization of ϵ-caprolactone in one step

2016 ◽  
Vol 69 (5-6) ◽  
pp. 1600197 ◽  
Author(s):  
Aurelio Ramírez-Hernández ◽  
Alejandro Aparicio-Saguilán ◽  
José L. Mata-Mata ◽  
Gerardo González-García ◽  
Héctor Hernández-Mendoza ◽  
...  
Keyword(s):  
Chemical Modification ◽  
In Situ Polymerization ◽  
One Step
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