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.

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.

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.

scholarly journals Synthesis and Properties of Polyimide Silica Nanocomposite Film with High Transparent and Radiation Resistance

Nanomaterials ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 562
Author(s):  
Jindong Huang ◽  
Guanglu Zhang ◽  
Beiping Dong ◽  
Juncheng Liu
Keyword(s):  
Composite Film ◽  
In Situ Polymerization ◽  
Wavelength Region ◽  
Film Structure ◽  
Sio2 Content ◽  
Light Transmittance ◽  
Elongation At Break ◽  
Thermal Stability Of ◽  
High Wavelength

In order to prepare flexible glass cover sheet materials suitable for space solar cells, fluorinated diamine 2,2’-bistrifluoromethyl benzidine (TFDB) and fluorinated dianhydride 4,4’ (hexafluoroisopropyl) diphthalic dianhydride (6FDA) as the monomer, polyimide (PI)/SiO2 composite film was synthesized by in situ polymerization, and the influence of coupling agent and SiO2 nanoparticle content on the film structure and properties was studied. The results show that PI synthesized from fluorine-containing monomers has better light transmittance, and the highest transmittance can reach 91.4%. The average visible light transmittance of the composite film decreases with the increase of SiO2 content, and the transmittance of the film decreases less in the high-wavelength region and greatly decreases in the low-wavelength region. The tensile strength and elastic modulus of PI/SiO2 composite film increase with the increase of SiO2 content, first increase and then decrease, reaching the maximum when the content is 10%; while the elongation at break of the composite film gradually increases with the increase of SiO2 content reduce. The thermal stability of PI/SiO2 composite film increases with the increase of SiO2 content. The doping of nano-SiO2 significantly suppresses the influence of irradiation on the mechanical properties of the film.

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

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.

scholarly journals Ultraflexible and Mechanically Strong Polymer/Polyaniline Conductive Interpenetrating Nanocomposite via In Situ Polymerization of Vinyl Monomer

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2159
Author(s):  
Haihua Wang ◽  
Xiaojing Wu ◽  
Xuan Qin ◽  
Guiqiang Fei ◽  
Liyu Sun ◽  
...  
Keyword(s):  
Tensile Strength ◽  
In Situ Polymerization ◽  
Conductive Polymer ◽  
High Strength ◽  
Polymer Nanocomposite ◽  
Vinyl Monomer ◽  
Elongation At Break ◽  
Conductive Polyaniline ◽  
High Flexibility

Simultaneous enhancement of conductivity and mechanical properties for polyaniline/polymer nanocomposite still remains a big challenge. Here, a reverse approach via in situ polymerization (RIP) of vinyl monomers in waterborne polyaniline dispersion was raised to prepare conductive polyaniline (GPANI)/polyacrylate (PMB) interpenetrating polymer (GPANI-PMB) nanocomposite. GPANI/PMB physical blend was simultaneously prepared as reference. The conductive GPANI-PMB nanocomposite film with compact pomegranate-shape morphology is homogeneous, ultraflexible and mechanically strong. With incorporating a considerable amount of PMB into GPANI via the RIP method, only a slight decrease from 3.21 to 2.80 S/cm was detected for the conductivity of GPANI-PMB, while the tensile strength significantly increased from 25 to 43.5 MPa, and the elongation at break increased from 40% to 234%. The water absorption of GPANI-PMB3 after 72 h immersion decreased from 24.68% to 10.35% in comparison with GPANI, which is also higher than that of GPANI/PMB. The conductivity and tensile strength of GPANI-PMB were also much higher than that of GPANI/PMB (0.006 S/cm vs. 5.59 MPa). Moreover, the conductivity of GPANI-PMB remained almost invariable after folding 200 times, while that of GPANI/PMB decreased by almost half. This RIP approach should be applicable for preparing conventional conductive polymer nanocomposite with high conductivity, high strength and high flexibility.

Ag–Loaded Polypyrrole/Carbon Nanotube: One-Step In Situ Polymerization and Improved Capacitance

2012 ◽  
Vol 531 ◽  
pp. 35-38 ◽  
Author(s):  
Hong Yu Mi ◽  
You Long Xu
Keyword(s):  
Carbon Nanotube ◽  
In Situ Polymerization ◽  
Conductive Polymer ◽  
Three Dimensional ◽  
High Specific Capacitance ◽  
Electrochemical Reversibility ◽  
Nanotube Composites ◽  
One Step ◽  
Carbon Nanotube Composites

Ternary composites of Ag–loaded polypyrrole/carbon nanotube (Ag–PPy/CNT) are prepared using a one–step in situ polymerization. Ag nanoparticles are uniformly decorated on the core–shell PPy/CNT networks. This approach provides a simple, easily accessible strategy for preparing three–dimensional noble metal–conductive polymer–carbon nanotube composites. Electrochemical properties of Ag–loaded composites are evaluated to understand the effect of Ag on the structure and kinetic process of the composite. Results indicate that the composites have good electrochemical reversibility and high specific capacitance. The specific capacitiance of Ag–PPy/CNT composites are enhanced greatly from 206.7 F g–1 of PPy/CNT composites to 528.6 F g–1 at 3 mA cm–2. This demonstrates that combining nano–sized Ag with supercapacitor materials is very effective in promoting electrochemical performance of materials.

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