Effect of POSS-Modified Montmorillonite on Thermal, Mechanical, and Electrical Properties of Unsaturated Polyester Nanocomposites

Montmorillonite (MMT) displays excellent cohesion with an unsaturated polyester (UP) matrix to generate a material which exhibits an extensive range of commercial applications. The organic modification of MMT using polyhedral oligomeric silsesquioxanes (POSS) and the effect of POSS-MMT on the thermal, mechanical, and electrical properties of UP are reported here. Transmission electron microscopy (TEM) images were used to characterize the modification of MMT using POSS. Modified MMT (POSS-MMT) was incorporated, at different wt.% (0.5, 1, 3, 5), into UP via in-situ polymerization. The presence of POSS-MMT enhanced the characteristic properties of UP as a consequence of good dispersion in the polymer matrix. Scanning electron microscopy (SEM) images support effective POSS-MMT dispersion leading to tensile strength enhancement of a UP/POSS-MMT nanocomposite (3 wt.% POSS-MMT) by 54.7% as compared to that for unmodified UP. TGA displays a 35 °C improvement of thermal stability (10% mass loss) at 5% POSS-MMT incorporation, while the electrical conductivity is improved by 108 S/m (3 wt.% POSS-MMT) in comparison to that for unmodified UP. The conventional obstacle of UP associated with shrinkage weight loss during curing seems to be moderated with POSS-MMT incorporation (3%) resulting in a 27.8% reduction in shrinkage weight loss. These fabricated nanocomposites expand the versatility of UP as a high-performance material owing to enhancements of properties.

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Novel Unsaturated Polyester Nanocomposites via Hybrid 3D POSS-Modified Graphene Oxide Reinforcement: Electro-Technical Application Perspective

Nanomaterials ◽

10.3390/nano10020260 ◽

2020 ◽

Vol 10 (2) ◽

pp. 260 ◽

Cited By ~ 4

Author(s):

Nidhin Divakaran ◽

Manoj B. Kale ◽

T. Senthil ◽

Suhail Mubarak ◽

Duraisami Dhamodharan ◽

...

Keyword(s):

Graphene Oxide ◽

High Performance ◽

Unsaturated Polyester ◽

Interactive Effect ◽

Functionalized Graphene ◽

Polyhedral Oligomeric Silsesquioxanes ◽

Functionalized Graphene Oxide ◽

Limiting Oxygen Index ◽

Modified Graphene Oxide ◽

Hybrid Framework

The latest trends in technologies has shifted the focus to developing innovative methods for comprehensive property enhancement of the polymer composites with facile and undemanding experimental techniques. This work reports an elementary technique to fabricate high-performance unsaturated polyester-based nanocomposites. It focuses on the interactive effect of polyhedral oligomeric silsesquioxanes (POSS)-functionalized graphene oxide (GO) within the unsaturated polymermatrix. The hybrid framework of POSS-functionalized graphene oxide has been configured via peptide bonding between the aminopropyl isobutyl POSS and graphene oxide. The synergistic effect of POSS and graphene oxide paved the way for a mechanism to inculcate a hybrid framework within the unsaturated polyester (UP) via in situ polymerization to develop UP/GO-POSS nanocomposites. The surface-appended POSS within the graphene oxide boosted its dispersion in the UP matrix, furnishing an enhancement in tensile strength of the UP/GO-POSS composites by 61.9%, thermal decomposition temperature (10% mass loss) by 69.8 °C and electrical conductivity by 108 S/m, in contrast to pure UP. In particular, the homogenous influence of the POSS-modified GO could be vindicated in the surging of the limiting oxygen index (%) in the as-prepared nanocomposites. The inclusive property amelioration vindicates the use of fabricated nanocomposites as high-performance nanomaterials in electrotechnical applications.

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Mechanical and electrical properties of mesoporous MCM-41/unsaturated polyester in situ composites

Materials Research Innovations ◽

10.1179/1432891715z.0000000001404 ◽

2015 ◽

Vol 19 (sup1) ◽

pp. S1-199-S1-202

Author(s):

J. Lv ◽

S. L. Hu ◽

H. S. Liu ◽

D. M. Zeng ◽

C. Wei ◽

...

Keyword(s):

Electrical Properties ◽

Unsaturated Polyester ◽

In Situ Composites ◽

Mechanical And Electrical Properties ◽

Mcm 41

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Superior mechanical and electrical properties of multiwall carbon nanotube reinforced acrylonitrile butadiene styrene high performance composites

Composites Part B Engineering ◽

10.1016/j.compositesb.2015.08.055 ◽

2015 ◽

Vol 83 ◽

pp. 58-65 ◽

Cited By ~ 77

Author(s):

Jeevan Jyoti ◽

Surita Basu ◽

Bhanu Pratap Singh ◽

S.R. Dhakate

Keyword(s):

Carbon Nanotube ◽

Electrical Properties ◽

High Performance ◽

Acrylonitrile Butadiene Styrene ◽

Multiwall Carbon Nanotube ◽

Mechanical And Electrical Properties ◽

Multiwall Carbon ◽

Butadiene Styrene

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A Critical Study of the Mechanical and Electrical Properties of the PHANToM Haptic Interface and Improvements for Highperformance Control

Presence Teleoperators & Virtual Environments ◽

10.1162/105474602321050695 ◽

2002 ◽

Vol 11 (6) ◽

pp. 555-568 ◽

Cited By ~ 159

Author(s):

Murat Cenk Çavuşoğlu ◽

David Feygin ◽

Frank Tendick

Keyword(s):

Electrical Properties ◽

High Performance ◽

Original System ◽

Low Noise ◽

Velocity Estimation ◽

Open Architecture ◽

Haptic Interface ◽

Critical Study ◽

Mechanical And Electrical Properties ◽

Wall Stiffness

This paper presents a critical study of the mechanical and electrical properties of the PHANToM haptic interface and improvements to overcome its limitations for applications requiring high-performance control. Target applications share the common requirements of low-noise/granularity/latency measurements, an accurate system model, high bandwidth, the need for an open architecture, and the ability to operate for long periods without interruption while exerting significant forces. To satisfy these requirements, the kinematics, dynamics, high-frequency dynamic response, and velocity estimation of the PHANToM system are studied. Furthermore, this paper presents the details of how the unknown subsystems of the stock PHANToM can be replaced with known, high-performance systems and how additional measurement electronics can be interfaced to compensate for some of the PHANToM's shortcomings. With these modifications, it is possible to increase the maximum achievable virtual wall stiffness by 35%, active viscous damping by 120%, and teleoperation loop gain by 50% over the original system. With the modified system, it is also possible to maintain higher forces for longer periods without causing motor overheating.

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Facile fabrication of MnO2-embedded 3-D porous polyaniline composite hydrogel for supercapacitor electrode with high loading

High Performance Polymers ◽

10.1177/0954008319860893 ◽

2019 ◽

Vol 32 (3) ◽

pp. 286-295 ◽

Cited By ~ 3

Author(s):

Huabo Huang ◽

Renpeng Chen ◽

Shuaiyi Yang ◽

Liang Li ◽

Yulan Liu ◽

...

Keyword(s):

Electron Microscopy ◽

Porous Structure ◽

High Performance ◽

Electrochemical Impedance ◽

In Situ Polymerization ◽

Composite Hydrogel ◽

High Loading ◽

Supercapacitor Electrode ◽

One Pot ◽

Charge Discharge

To obtain the promising pseudocapacitance of MnO2, the composite hydrogel of MnO2 and polyaniline (PANI) was fabricated using in situ polymerization of aniline hydrochloride in the aqueous solution containing commercial MnO2 nanoparticles and additives. Both scanning electron microscopy and transmission electron microscopy results indicated that the composite hydrogel exhibited a 3-D porous structure, within which MnO2 nanoparticles were uniformly embedded. The investigations of cyclic voltammetry, galvanostatic charge−discharge, and electrochemical impedance spectroscopy demonstrated superior supercapacitor (SC) performance of the hydrogel electrode even with high loading. The electrode with loading of 1.5 mg cm–2 showed a favorable specific capacitance (293 F g–1, 10 mV s–1), which only decreased to 258 F g–1 when the loading of the electrode was seven times higher (10.8 mg cm–2). Furthermore, the hydrogel electrode displayed good cycle stability in the acidic solution (81% capacitance retention after 1000 charge/discharge cycles). The favorable electrochemical performance of the composite hydrogel should be attributed to the fast electron/ion transport and good protection for MnO2 in the 3-D porous structure. Due to the facile one-pot synthesis and optimized nanostructure, it could be expected that MnO2-embedded 3-D porous PANI composite hydrogels have great application in the field of high-performance electrode with high loading for SCs.

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Synthesis and Characterization of Conducting PANDB/χ-Al2O3 Core-Shell Nanocomposites by In Situ Polymerization

Polymers ◽

10.3390/polym13162787 ◽

2021 ◽

Vol 13 (16) ◽

pp. 2787

Author(s):

Cheng-Ho Chen ◽

Ying-Chen Lin ◽

Fu-Su Yen

Keyword(s):

Electron Microscopy ◽

In Situ Polymerization ◽

Weight Ratio ◽

Core Shell ◽

Sem Images ◽

Dodecylbenzenesulfonic Acid ◽

Blend Film ◽

Transmission Electron

Polyaniline doped with dodecylbenzenesulfonic acid/χ-aluminum oxide (PANDB/χ-Al2O3) conducting core-shell nanocomposites was synthesized via an in situ polymerization method in this study. PANDB was synthesized in the presence of dodecylbenzenesulfonic acid (DBSA), which functioned as a dopant and surfactant. The electrical conductivity of the conducting PANDB/χ-Al2O3 core-shell nanocomposite was approximately 1.7 × 10−1 S/cm when the aniline/χ-Al2O3 (AN/χ-Al2O3) weight ratio was 1.5. The transmission electron microscopy (TEM) results indicated that the χ-Al2O3 nanoflakes were thoroughly coated by PANDB to form the core-shell (χ-Al2O3-PANDB) structure. The TEM and field-emission scanning electron microscopy (FE-SEM) images of the conducting PANDB/χ-Al2O3 core-shell nanocomposites also indicated that the thickness of the PANDB layer (shell) could be increased as the weight ratio of AN/χ-Al2O3 was increased. In this study, the optimum weight ratio of AN/χ-Al2O3 was identified as 1.5. The conducting PANDB/χ-Al2O3 core-shell nanocomposite was then blended with water-based polyurethane (WPU) to form a conducting WPU/PANDB/χ-Al2O3 blend film. The resulting blend film has promising antistatic and electrostatic discharge (ESD) properties.

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Preparation and Properties of Rigid Cross-Linked PVC Foam

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.311-313.1056 ◽

2011 ◽

Vol 311-313 ◽

pp. 1056-1060 ◽

Cited By ~ 4

Author(s):

Ai Hua Shi ◽

Guang Cheng Zhang ◽

Heng Tai Pan ◽

Zhong Lei Ma ◽

Chen Hui Zhao

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Weight Loss ◽

Cellular Structure ◽

High Performance ◽

Chemical Structure ◽

Molding Process ◽

Thermogravimetric Analyzer ◽

Infrared Spectrometer ◽

Scanning Electron

High performance rigid cross-linked PVC foam has been prepared by molding process and boiling foam process with the main materials including polyvinyl chloride paste resin (PVC), liquefied methylene bis-phenyl diisocyanate (MDI-L) and methylhexahydrophthalic anhydride (MHHPA). The chemical structure, cellular structure and thermal properties were respectively characterized by fourier transform infrared spectrometer (FTIR), scanning electron microscopy (SEM), thermomechanical analyzer (TMA) and thermogravimetric analyzer (TGA). Results showed that the foam had a uniform cellular structure, and cell size was about 760μm. The glass transition temperature (Tg) was 81°C and 5% weight loss temperature (T5d) was 252°C.

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A Parametric Study and Characterization of Porous, Non-Permeable, and Conductive PEGDA-HEMA Hydrogels

ASME 2010 Conference on Smart Materials, Adaptive Structures and Intelligent Systems, Volume 2 ◽

10.1115/smasis2010-3739 ◽

2010 ◽

Author(s):

Christine Chan ◽

Shannon Chang ◽

Hani E. Naguib

Keyword(s):

Electrical Properties ◽

Water Content ◽

Parametric Study ◽

In Situ Polymerization ◽

Decomposition Temperature ◽

Mechanical And Electrical Properties ◽

Conductive Hydrogels ◽

Further Development

This study involved the development and characterization of novel porous, non-permeable, and conductive hydrogels. The hydrogels were fabricated with HEMA and crosslinked with PEGDA through a complete parametric study of the synthesis parameters which included water content and crosslinking content. The hydrogels were fabricated using UV photopolymerization and in situ polymerization of PPy, and characterization was conducted with respect to their physical, thermal, mechanical, and electrical properties. The physical properties were analyzed with respect to their swelling ratio and equilibrium water content. The thermal properties were analyzed based on the decomposition temperature and residue weight. The mechanical properties examined the elastic modulus of the hydrogels, and the electrical properties investigated the conductivity of the hydrogels. The relationships observed between the processing, structure, and resulting properties provide the basis for further development and application of these porous, non-permeable, and conductive hydrogels.

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