Preparation and Thermal Properties of Novolac Resin/Graphite Nanosheet Composites

2011 ◽  
Vol 391-392 ◽  
pp. 209-213
Author(s):  
Peng Cao ◽  
Shu Hua Qi ◽  
Sha Sha Li
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
In Situ Polymerization ◽  
Expanded Graphite ◽  
Resin Matrix ◽  
Novolac Resin ◽  
Graphite Nanosheets ◽  
Graphite Nanosheet ◽  
Thermal Conducting

In this study, a high thermal conductivity novolac resin /graphite nanosheet composite have been prepared via in situ polymerization at the presence of sonicated expanded graphite. Graphite nanosheets prepared via powering the expanded graphite had a thickness ranging 10~100 nm and a diameter range 5~10μm and were excellent nanofiller for the fabrication of polymer/graphite nanocomposite. Scanning election microscopy was used to characterize the structure and dispersion of the graphite nanosheets and the composites. The results showed that the structure of the nanosheets played an important role in forming thermal conducting network in the novolac resin matrix.

Preparation and Characteristic of PSMA/EG Composite Materials

2010 ◽  
Vol 163-167 ◽  
pp. 1951-1954
Author(s):  
Gui Xiang Hou ◽  
Hai Ning Na ◽  
Xiao Ming Sang
Keyword(s):  
High Temperature Oxidation ◽  
In Situ Polymerization ◽  
Expanded Graphite ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
Temperature Oxidation ◽  
X Ray ◽  
Graphite Nanosheets ◽  
Composite Granules

Graphite nanosheets prepared through high-temperature oxidation via powdering the expanded graphite. After soaking the expanded graphite with styrene(S) and maleic anhydride(MA) monomers, the polymer (Poly(S-co-MA))/expanded graphite(EG) (PSMA/EG) composite granules were obtained by in situ polymerization. Light microscope，scanning electron microscope and X-ray diffraction characterization were performed. SEM analysis indicate that the expanded graphite was mostly tore to sheets with thickness of 50–80 nm and with diameter of 1μm. Optical micrographs showed that the distribution of graphite platelets is found to be nearly uniform.

Fabrication Polyurethane/Expanded Graphite Powder Composite Antistatic Sponge by In Situ Polymerization

2012 ◽  
Vol 479-481 ◽  
pp. 395-398
Author(s):  
Dan Qing Chen
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
In Situ Polymerization ◽  
Expanded Graphite ◽  
Graphite Powder ◽  
Polymeric Matrix ◽  
Powder Composite

This document explains and demonstrates how to prepare Polyurethane(PU)/Expanded Graphite powder(EGp) composite antistatic sponge by in situ polymerization. The morphology、mechanical、electrical and thermal properties of the PU/EGp composite antistatic sponge have been investigated. PU/ EGp composite sponge have better mechanical properties than that of CB composite. The resistivity of PU/EGp composite antistatic sponge can reach at about 108Ω•cm at the content around 5wt% of the EGp. EGp can stably exist in PU sponge and has little influence to the polymeric matrix while being heated.

Polyphenylene sulfide- expanded graphite nanocomposites

2016 ◽  
Vol 30 (12) ◽  
pp. 1603-1614 ◽  
Author(s):  
BTS Ramanujam ◽  
S Radhakrishnan ◽  
SD Deshpande
Keyword(s):  
Percolation Threshold ◽  
In Situ Polymerization ◽  
Expanded Graphite ◽  
Polyphenylene Sulfide ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Graphite Nanosheets ◽  
Electrical Percolation ◽  
Scanning Electron Microcopy

Polyphenylene sulfide (PPS)-expanded graphite (ExGr) conducting nanocomposites have been prepared by powder mixing and in situ polymerization routes after sonicating ExGr particles in acetone. Synthesized PPS has been used to make powder mixed composites. The powder mixed composites exhibit a percolation threshold of 3 wt% due to the formation of graphite nanosheets. When PPS-ExGr composites are prepared by in situ polymerization route, very low electrical percolation threshold less than 0.5 wt% ExGr is obtained. The low percolation threshold obtained is attributed to better dispersion of ExGr nanosheets in the polymer matrix when compared to powder mixed composites. The synthesized PPS has been characterized by X-ray diffraction, differential scanning calorimetry, and infrared spectroscopy. The formation of graphite nanosheets has been confirmed by transmission and scanning electron microcopy analysis.

Electrical Conducting Properties of Unsaturated Polyester/Graphite Nanosheet Composite under Electric Field

2012 ◽  
Vol 455-456 ◽  
pp. 520-523
Author(s):  
Hong Yan Zhang ◽  
Hai Quan Wang ◽  
Lin Tong Wang ◽  
Yi Min Feng
Keyword(s):  
Electric Field ◽  
Polyester Resin ◽  
In Situ Polymerization ◽  
Unsaturated Polyester ◽  
Graphite Nanosheets ◽  
Ac Electric Field ◽  
Graphite Nanosheet ◽  
Electrical Conducting ◽  
Scanning Electron

Unsaturated polyester resin/Graphite nanosheet composites were prepared using in situ polymerization under AC electric field which was applied during composite curing to induce orientation of graphite nanosheets. Scanning electron microscopy (SEM) has been applied to demonstrate the orientation of graphite nanosheets As a result, the percolation threshold was decreased to 0.25 wt% due to the orientation of the graphite nanosheets.

Activated Nitrogen-Enriched Carbon/Reduced Expanded Graphite Composites for Supercapacitors

2011 ◽  
Vol 211-212 ◽  
pp. 440-444 ◽  
Author(s):  
Shu Hui Tong ◽  
Chuan Li Qin ◽  
Zheng Jin ◽  
Xue Song Wang ◽  
Xu Duo Bai
Keyword(s):  
Electrode Material ◽  
In Situ Polymerization ◽  
Expanded Graphite ◽  
Mechanical Mixture ◽  
Electrochemical Measurements ◽  
Electrochemical Performances ◽  
Cycle Stability ◽  
Symmetric Supercapacitor ◽  
Graphite Composites

Activated nitrogen-enriched carbon/reduced expanded graphite composites (ANC/REG-c) with different composite ratio were prepared by in-situ polymerization, carbonization, activation and reduction of aniline and expanded graphite. These were characterized by XPS, SEM and electrochemical measurements. XPS shows that N atoms exist in the ANC and ANC/REG-c. Compared to mechanical mixture of ANC and REG(ANC/REG-m), ANC/REG-c shows lower resistance and higherCp1(185.4 F/g) vs 124.3 F/g of ANC/REG-m measured by CV due to the introduction of the composite sturcture. When the composite ratio of ANC/REG-c is 6:1, the ANC/REG-c shows the highestCp1(264.0 F/g) and its symmetric supercapacitor also shows the best synthetical electrochemical performances. The optimal supercapacitor presents good cycle stability. ANC/REG-c is a suitable electrode material for supercapacitors.

scholarly journals Influence of expanded graphite (EG) and graphene oxide (GO) on physical properties of PET based nanocomposites

2014 ◽  
Vol 16 (4) ◽  
pp. 45-50 ◽  
Author(s):  
Sandra Paszkiewicz ◽  
Małgorzata Nachman ◽  
Anna Szymczyk ◽  
Zdeno Špitalský ◽  
Jaroslav Mosnáček ◽  
...  
Keyword(s):  
Physical Properties ◽  
In Situ Polymerization ◽  
Crystallization Rate ◽  
Expanded Graphite ◽  
Exfoliated Graphene ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Agglomeration Of Nanoparticles ◽  
Graphite Sheets

Abstract This work is the continuation and refinement of already published communications based on PET/EG nanocomposites prepared by in situ polymerization1, 2. In this study, nanocomposites based on poly(ethylene terephthalate) with expanded graphite were compared to those with functionalized graphite sheets (GO). The results suggest that the degree of dispersion of nanoparticles in the PET matrix has important effect on the structure and physical properties of the nanocomposites. The existence of graphene sheets nanoparticles enhances the crystallization rate of PET. It has been confirmed that in situ polymerization is the effective method for preparation nanocomposites which can avoid the agglomeration of nanoparticles in polymer matrices and improve the interfacial interaction between nanofiller and polymer matrix. The obtained results have shown also that due to the presence of functional groups on GO surface the interactions with PET matrix can be stronger than in the case of exfoliated graphene (EG) and matrix.

Significantly enhanced and precisely modeled thermal conductivity in polyimide nanocomposites with chemically modified graphene via in situ polymerization and electrospinning-hot press technology

2018 ◽  
Vol 6 (12) ◽  
pp. 3004-3015 ◽  
Author(s):  
Yongqiang Guo ◽  
Genjiu Xu ◽  
Xutong Yang ◽  
Kunpeng Ruan ◽  
Tengbo Ma ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
In Situ Polymerization ◽  
Hot Press ◽  
Conductivity Model ◽  
Chemically Modified ◽  
Thermal Conductivity Model ◽  
Modified Graphene ◽  
Thermal Conductivities

Significantly improved thermal conductivities and a more accurate thermal conductivity model were achieved.

scholarly journals Structural, morphological and thermal properties of nanocomposites poly(GMA)/clay prepared by ultrasound and in-situ polymerization

2018 ◽  
Vol 48 ◽  
pp. 188-198 ◽  
Author(s):  
Zakaria Cherifi ◽  
Bouhadjar Boukoussa ◽  
Aniss Zaoui ◽  
Mohammed Belbachir ◽  
Rachid Meghabar
Keyword(s):  
Thermal Properties ◽  
In Situ Polymerization
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