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.

Synthesis, Characterization and Corrosion Protection Properties of Polyaniline/TiO2 Nanocomposite

2011 ◽  
Vol 399-401 ◽  
pp. 2083-2086
Author(s):  
Lian Zhong ◽  
Yan Hua Wang ◽  
Yong Hong Lu
Keyword(s):  
Strong Interaction ◽  
In Situ Polymerization ◽  
Polymer Nanocomposite ◽  
Aniline Monomer ◽  
Nano Tio2 ◽  
Conductive Polyaniline ◽  
Anticorrosion Performance ◽  
Protective Performance ◽  
Epoxy Paint

In this study, conductive polyaniline (PANi)–titania (TiO2) nanocomposites with core–shell structure were prepared and their anticorrosion properties were investigated. PANi/nano-TiO2 composite were prepared by in situ polymerization of aniline monomer in the presence of TiO2 nanoparticles. The morphology and structure of the polymer nanocomposite was characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR), respectively. SEM and FTIR spectra measurements show that PANi and TiO2 nanoparticles are not simply blended or mixed up, and a strong interaction exists at the interface of nano-TiO2 and PANi. From the anticorrosion investigation in 3.5%NaCl, it is revealed that the protective performance of epoxy paint containing PANi/nano-TiO2 composite is significantly improved than PANi or a mixture of polyaniline and nano-TiO2. From the improved anticorrosion performance, it also indicate that PANi and TiO2 nanoparticles are not simply blended or mixed up, the strong interaction exists at the interface of PANi and nano-TiO2. It is the strong interaction that results in the coordinated effect and more excellent anticorrosion performance.

In Situ Polymerization Approach to Magnesium Hydroxide-Reinforced PA6 Composites

2011 ◽  
Vol 399-401 ◽  
pp. 457-460
Author(s):  
Li Li Xu ◽  
Yu Hao Deng ◽  
Ye Wang ◽  
Chang Hua Liu ◽  
Sheng Peng Liu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Tensile Strength ◽  
Magnesium Hydroxide ◽  
In Situ Polymerization ◽  
Polyamide 6 ◽  
Elongation At Break ◽  
Izod Impact ◽  
Scanning Electron

Polyamide 6 (PA6)/magnesium hydroxide (MH) nanoparticles composites have been prepared by in situ polymerization of ε-caprolactam in the presence of pristine MH and γ-aminopropyl-triethoxysilan ( KH550 ) grafted MHs (MMH). Compared with pure PA6, the tensile strength and elongation at break of PA6/MH and PA6/MMH composites shown obvious increasement and attain maximum at loading of 3 wt% MHs. The tensile strength and elongations at break of PA6/MMH composites exhibited notably enhancement contrast with that of PA6/MH composites. Comparing with PA6/MH composites, the izod impact strength of PA6/MMH composites were also improved. Scanning electron microscopy (SEM) shown that MMH particles were homogeneous dispersed in PA6 matrix due to the surface modification of grafting KH550.

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 On engineering of properties of wood-polypropylene composite

2006 ◽  
pp. 59-70 ◽  
Author(s):  
Milanka Djiporovic ◽  
Jovan Miljkovic ◽  
Eva Dingova
Keyword(s):  
Tensile Strength ◽  
Filler Content ◽  
Wood Flour ◽  
Beech Wood ◽  
Impact Resistance ◽  
High Strength ◽  
Polypropylene Composite ◽  
Elongation At Break ◽  
New Type ◽  
Polypropylene Matrix

New materials based on wood have the advantage in the sense that their properties can be engineered so as to correspond to user demands. The properties which can be engineered are those relating both to their utilisation and machining, in particular - the tensile strength, elongation at break, modulus of elasticity and impact resistance. The research at the Faculty of Forestry and "Hipol" Chemical Industry related to the new type of wood-polypropylene composite. The content of wood filler was varied in the range between 40% and 70% mass contents of beech wood flour. After the highest tensile strength at 50% of filler content was determined, the effect of the wood filler origin was also examined at this content value. Therefore, wood flour of beech, poplar, acetylated pine and the waste MDF was used. The influence of the composition of the wood filler (beech combined with MDF, poplar and acetylated pine) in comparison with pure polypropylene matrix was also examined, as well as the effect of the type of coupling agent. Hopefully, the results obtained in this study might serve as the initial data for production of easily machined high-strength composites.

scholarly journals Thermoplastic Elastomeric Composites Filled with Lignocellulose Bioadditives, Part 2: Flammability, Thermo-Oxidative Aging Resistance, Mechanical and Barrier Properties

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1608 ◽  
Author(s):  
Justyna Miedzianowska ◽  
Marcin Masłowski ◽  
Krzysztof Strzelec
Keyword(s):  
Tensile Strength ◽  
Natural Rubber ◽  
Ethylene Vinyl Acetate ◽  
Barrier Properties ◽  
Environmental Friendliness ◽  
Elongation At Break ◽  
Oxidative Aging ◽  
High Flexibility ◽  
Petroleum Derivatives ◽  
Properties Of Composites

The work covers the characteristics of the functional properties of composites bordering thermoplastics and elastomers. The research is a continuation of considerations on blends in the form of a mixture of natural rubber (NR) with an ethylene–vinyl acetate copolymer (EVA) and the addition of a lignocellulose biofiller (wheat straw). After describing the processing and rheology as well as examining the thermal properties and morphology of composites (Part 1), the second part focuses on the characteristics of their performance. The effect of both different ratios of mixed polymers and the amount of filler on tensile strength and elongation at break, resistance to thermo-oxidative aging, hardness, tear resistance, barrier and damping properties, as well as flammability were investigated. The increased EVA content has shown a positive effect on tensile strength, elongation at break, resistance to thermo-oxidative aging, hardness, relative damping, tear strength, barrier and burning delay. On the other hand, a larger amount of natural rubber provides high flexibility and promotes the creation of a reinforcing structure by the filler used. Moreover, a significant impact of the addition of cereal straw on the barrier, damping, strength and flammability properties of composites was also noted. The great advantage of the prepared compositions in relation to commercial plastics is their environmental friendliness, primarily by replacing some petroleum derivatives of plastics with natural rubber and straw fibers.

PLA-Based Biodegradable Copolyester Nanocomposites: Preparation, Characterization and Mechanical Properties

2011 ◽  
Vol 380 ◽  
pp. 290-293
Author(s):  
Bing Tao Wang ◽  
Ping Zhang ◽  
De Gao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Lactic Acid ◽  
Interfacial Adhesion ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Elongation At Break ◽  
Butylene Terephthalate ◽  
The Matrix ◽  
Different Characteristics

In situ melt copolycondensation was proposed to prepare biodegradable copolyester nanocomposites based on degradable components poly(L-lactic acid) (PLA), rigid segments poly(butylene terephthalate) (PBT), and nanoparticles polyhedral oligomeric silsesquioxanes (POSS). The morphologies and dispersions of two POSS nanoparticles (POSS-NH2 and POSS-PEG) in the copolyester PLABT matrix and their effects on the mechanical properties were investigated. The results demonstrated that the morphologies and dispersions of POSS-NH2 and POSS-PEG showed quite different characteristics. POSS-PEG took better dispersion in the PLABT, while POSS-NH2 had poor dispersions and formed crystalline microaggregates. Due to the good dispersion and strong interfacial adhesion of POSS-PEG with the matrix, the tensile strength and Young’s modulus were greatly improved from 6.4 and 9.6 MPa for neat PLABT up to 11.2 and 70.7 MPa for PLABT/POSS-PEG nanocomposite. Moreover, the incorporation of POSS-PEG could impart macromolecular chains good flexibility and improve the mobility of the chains, so the the elongation at break of PLABT/POSS-PEG nanocomposite dramatically increased from 190 to 350 % compared with neat PLABT.

Structural Characterization of Wood-Polymer Composite Prepared by In Situ Polymerization of Styrene

2011 ◽  
Vol 675-677 ◽  
pp. 491-494
Author(s):  
Yong Feng Li ◽  
Yi Xing Liu ◽  
Xiu Rong Li ◽  
Jian Li ◽  
Xiang Ming Wang
Keyword(s):  
Porous Structure ◽  
Polymer Composite ◽  
High Performance ◽  
In Situ Polymerization ◽  
Xrd Analysis ◽  
Vinyl Monomer ◽  
Environmental Characteristic ◽  
Wood Polymer ◽  
Wood Polymer Composite

A novel biomass composite, wood-polymer composite with potential good mechanical properties, durability and environmental characteristic capable of applying in fields of construction and traffic as structural material, was prepared by generating high-performance polymer from in situ polymerization of styrene in wood porous structure. The vinyl monomer, styrene, combing with 1wt% AIBN as an initiation, was first impregnated into wood porous structure under a vacuum/pressure condition, and then in situ polymerized through a thermal treatment. The structure of the resultant composite was characterized by SEM, FTIR and XRD. Results show that styrene polymerized into polystyrene through free radical polymerization, and the resultant polymer fully filled in wood porous structure in a column form, partly contacting wood matrix. FTIR analysis indicates that polystyrene generated into wood pores, indicating weak interaction between them. XRD analysis suggests that the polystyrene generated into wood pores mainly existed in an amorphous form.

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