In situ polymerization approach to cellulose–polyacrylamide interpenetrating network hydrogel with high strength and pH-responsive properties

Cellulose ◽  
2018 ◽  
Vol 26 (3) ◽  
pp. 1825-1839 ◽  
Author(s):  
Fengcai Lin ◽  
Xiangchao Lu ◽  
Zi Wang ◽  
Qilin Lu ◽  
Guanfeng Lin ◽  
...  
Keyword(s):  
In Situ Polymerization ◽  
High Strength ◽  
Ph Responsive ◽  
Interpenetrating Network

scholarly journals A New Route to Fabricate Multifunctional and Multistage Composite Nanoparticle

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Xin Wang ◽  
Pin Chen ◽  
Xiaohong Hu
Keyword(s):  
In Situ Polymerization ◽  
Response Property ◽  
Ph Responsive ◽  
Two Phase ◽  
Ph Response ◽  
Composite Nanoparticle ◽  
Multifunctional Nanoparticle ◽  
In Situ Processing ◽  
Mild Acid

The focus of nanoparticle research is on exploring its application in all kinds of field. Among these, multifunctional nanoparticle attracts increasing interest due to its fittest property and adjustable property. Herein, a multifunctional and multistage nanoparticle considering the advantage of both nanogel and pH-responsive property has been designed and synthesized in the research. The composite nanoparticle was obtained by in situ processing and polymerization technique using acetylated β-cyclodextrin and gelatin as materials. Gelatin was first encapsulated into Ac-β-CD nanoparticle in order to investigate optimal fabrication conditions of W/O/W technique. The results showed that the nanoparticle had monodisperse characteristic and coarse spherical morphology, which was influenced by factors such as PVA concentration and water/oil ratio. In further step, two-phase composite nanoparticle could be obtained by combined W/O/W technique and in situ polymerization using optimal preparative parameters of W/O/W technique. Two-phase structure could be confirmed by TEM images and DLS results. Fabrication temperature had no effect on the diameters of composite nanoparticle, but influenced the encapsulated efficiency of nanogel. Finally, composite nanoparticle showed quick pH response property at mild acid medium and no obvious cytotoxicity.

Conducting Polymeric Hydrogel Electrolyte Based on Carboxymethylcellulose and Polyacrylamide/Polyaniline for Supercapacitor Applications

2017 ◽  
Vol 17 (01n02) ◽  
pp. 1760003 ◽  
Author(s):  
N. Suganya ◽  
V. Jaisankar ◽  
E. K. T. Sivakumar
Keyword(s):  
Conducting Polymer ◽  
In Situ Polymerization ◽  
Electronic Devices ◽  
Solution Polymerization ◽  
The Novel ◽  
Interpenetrating Network ◽  
Polymer Hydrogels ◽  
Structure And Morphology ◽  
Supercapacitor Applications

Conducting polymer hydrogels represent a unique class of materials that possess enormous application in flexible electronic devices. In the present work, conducting carboxymethylcellulose (CMC)-co-polyacrylamide (PAAm)/polyaniline was synthesized by a two-step interpenetrating network solution polymerization technique. The synthesized CMC-co-PAAm/polyaniline with interpenetrating network structure was prepared by in situ polymerization of aniline to enhance conductivity. The molecular structure and morphology of the copolymer hydrogels were characterized by Fourier transform infrared spectroscopy and scanning electron microscopy. The novel conducting polymer hydrogels show good electrical and electrochemical behavior, which makes them potentially useful in electronic devices such as supercapacitors, biosensors, bioelectronics, solar cells and memory devices.

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.

scholarly journals High-Strength GO/PA66 Nanocomposite Fibers via In Situ Precipitation and Polymerization

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1688
Author(s):  
Ao Gu ◽  
Jian Wu ◽  
Liming Shen ◽  
Xiaoyan Zhang ◽  
Ningzhong Bao
Keyword(s):  
High Performance ◽  
Melt Spinning ◽  
In Situ Polymerization ◽  
High Strength ◽  
Interfacial Bonding ◽  
Polymerization Process ◽  
Precipitation Process ◽  
Uniform Dispersion ◽  
Nanocomposite Fibers

The uniform dispersion of graphene oxide (GO) and strong interfacial bonding are the key factors in achieving the high mechanical strength of GO/polymer composites. It is still challenging to prepare GO/PA66 composites with uniform GO dispersion by the in situ polymerization method. In this paper, we prepare GO/PA66 salt nanocomposite by in situ precipitating PA66 salt with GO in ethanol. The GO/PA66 nanocomposite fibers are then fabricated using the as-prepared GO/PA66 salt by in situ polymerizing and melt spinning. By tuning the GO content, the tensile strength and Young’s modulus of the GO/PA66 fibers are increased from 265 ± 18 to 710 ± 14 MPa (containing 0.3 wt% GO) and from 1.1 ± 0.08 to 3.8 ± 0.19 GPa (containing 0.5 wt% GO), respectively. The remarkable improvements are attributed to the uniform dispersion of GO in the GO/PA66 salt nanocomposite via ionic bonding and hydrogen bonding in the in situ precipitation process, and the covalent interfacial bonding between the GO and PA66 during the in situ polymerization process. This work sheds light on the easy fabrication of high-performance PA66-based nanocomposites.

In situ observation of the martensitic transformation in (Mg,Y)-PSZ

1986 ◽  
Vol 44 ◽  
pp. 500-501
Author(s):  
R-R. Lee
Keyword(s):  
Martensitic Transformation ◽  
High Strength ◽  
Nucleation And Growth ◽  
In Situ Observation ◽  
Considerable Potential ◽  
Transmission Electron ◽  
Structural Applications ◽  
Applied Stresses ◽  
Kinetics Of

Partially-stabilized ZrO2 (PSZ) ceramics have considerable potential for advanced structural applications because of their high strength and toughness. These properties derive from small tetragonal ZrO2 (t-ZrO2) precipitates in a cubic (c) ZrO2 matrix, which transform martensitically to monoclinic (m) symmetry under applied stresses. The kinetics of the martensitic transformation is believed to be nucleation controlled and the nucleation is always stress induced. In situ observation of the martensitic transformation using transmission electron microscopy provides considerable information about the nucleation and growth aspects of the transformation.

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