scholarly journals Transparent Polyimide/Organoclay Nanocomposite Films Containing Different Diamine Monomers

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 135 ◽  
Author(s):  
Hyeon Il Shin ◽  
Jin-Hae Chang
Keyword(s):  
Mechanical Properties ◽  
Critical Concentration ◽  
Amic Acid ◽  
Optical Transparency ◽  
Nanocomposite Films ◽  
Hybrid Films ◽  
Solution Intercalation ◽  
Oh Groups ◽  
Cloisite 30B ◽  
Intercalation Polymerization

Poly (amic acid) s (PAAs) were synthesized using 4,4′-(hexafluoroisopropyl-idene) diphthalic anhydride (6FDA) and two types of diamines—bis(3-aminophenyl) sulfone (BAS) and bis(3-amino-4-hydroxyphenyl) sulfone (BAS-OH). Two series of transparent polyimide (PI) hybrid films were synthesized by solution intercalation polymerization and thermal imidization using various concentrations (from 0 to 1 wt%) of organically modified clay Cloisite 30B in PAA solution. The thermo-mechanical properties, morphology, and optical transparency of the hybrid films were observed. The transmission electronic microscopy (TEM) results showed that some of the clays were agglomerated, but most of them showed dispersed nanoscale clay. The effects of -OH groups on the properties of the two PI hybrids synthesized using BAS and BAS-OH monomers were compared. The BAS PI hybrids were superior to the BAS-OH PI hybrids in terms of thermal stability and optical transparency, but the BAS-OH PI hybrids exhibited higher glass transition temperatures (Tg) and mechanical properties. Analysis of the thermal properties and tensile strength showed that the highest critical concentration of organoclay was 0.50 wt%.

scholarly journals PVA/Gd2O3@Zno Nanocomposite Films as New Uv-Blockers: Structure and Optical Revealations

2021 ◽  
Author(s):  
H.S Vedhavathi ◽  
Divya U S ◽  
Madhukar B S ◽  
Pradeep Reddy Vanga ◽  
Kumara Swamy N
Keyword(s):  
Band Gap ◽  
Dopant Concentration ◽  
Combustion Method ◽  
Optical Characteristics ◽  
Nanocomposite Films ◽  
Solution Combustion ◽  
Scanning Calorimetry ◽  
Solution Intercalation ◽  
Oh Groups ◽  
Vis Spectroscopy

Abstract Herein we have synthesised Gadolinium oxide doped Zinc oxide (Gd 2 O 3 @ZnO) by solution combustion method and incorporated it as a nanofiller into Polyvinyl alcohol (PVA) polymer matrix using solution intercalation technique to get PVA/Gd 2 O 3 @ZnO nanocomposite film. The X-ray diffraction (XRD), Scanning electron microscopy (SEM), Differential scanning calorimetry (DSC) and UV-Vis spectroscopy were used to investigate the structural, morphological, glass transition temperature and optical properties of synthesized nanocomposites respectively. The optical propertiesof PVA/Gd 2 O 3 @ZnO film shows the interaction of –OH groups in PVA and dopant. From DSC, it is clear that Tg of prepared nano composites increases with increasing in dopant concentration. XRD analysis showed that the crystalline characteristics of the nanocomposites increases with increase in dopant concentration. The UV-Visible spectra reveals that there is decrease in indirect band gap of PVA from 4.94 eV to 3.12 eV and direct band gap from 4.90eV to 3.03 eV compared to pristine PVA Gd 2 O 3 @ZnO doped nanocomposite films showed multifold enhancement in optical characteristics such as refractive index of PVA doped nanocomposites compared pristine PVA, optical conductivity, finess coefficient, extinction coefficient on increasing in dopant concentration (0%, 2%, 4%, 6% and 8wt%). The optical characteristics of PVA/Gd 2 O 3 @ZnO nanocomposite films show excellent UV-blocking behaviour suggesting that, they are promising materials for optical devices.

Effect of Cloisite 30B nanoclay on the mechanical properties of HDPE nanocomposites

2017 ◽  
Vol 59 (4) ◽  
pp. 355-360 ◽  
Author(s):  
Natarajan Venkatesan ◽  
Govindasamy Bhavani Bhaskar ◽  
Sudhakar Rajesh ◽  
Kaliyaperumal Pazhanivel ◽  
Suresh Sagadevan
Keyword(s):  
Mechanical Properties ◽  
Cloisite 30B

Morphology and Mechanical Properties of Polyethylene Terephthalate/Ethylene Propylene Diene Monomer (PET/EPDM) in the Presence of Nanoclay

2020 ◽  
Vol 57 (3) ◽  
pp. 249-259
Author(s):  
Baifen Liu ◽  
Mohammad Mirjalili ◽  
Peiman Valipour ◽  
Sajad Porzal ◽  
shirin Nourbakhsh
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Thermal Destruction ◽  
Processing Temperature ◽  
Tem Analysis ◽  
Maximum Stiffness ◽  
Cloisite 30B ◽  
Nano Clay ◽  
The Matrix ◽  
Sample Maximum

This research deals with the mechanical properties, microstructure, and interrelations of triple nanocomposite based on PET/EPDM/Nanoclay. These properties were examined in different percentages of PET/EPDM blend with compatibilizer (Styrene-Ethylene/Butylene-Styrene)-G-(Maleic anhydrate) (SEBS-g-MAH). Results showed that the addition of 15% SEBS-g-MAH improved the toughness and impact strength of this nanocomposite. SEM micrographs indicated the most stable fuzzy microstructure in a 50/50 mixture of scattered phases of EPDM/SEBS-g-MAH. The effects of percentages of 1, 3, 5, 7 nanoclay Cloisite 30B (C30B) on the improvement of the properties were evaluated. With the addition of nano clay, the toughness and impact strength was reduced. Thermal destruction of nanoclay in processing temperature led to the decreasing dispersion of clay plates in the matrix and a reduction in the distances of nano clay plates in the composite compared to pure nano clay. XRD and TEM analysis was used to demonstrate the results. By adding 1% of nanoclay to the optimal sample, maximum stiffness, and Impact strength, among other nanocomposites, was achieved.

Research on Mechanical Properties of Modified Organic Montmorillonite Reinforced Nature Rubber(NR) Composites

2011 ◽  
Vol 239-242 ◽  
pp. 3231-3235
Author(s):  
Xiao Yu Zheng ◽  
Jin Cheng Wang ◽  
Ke Yang
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Natural Rubber ◽  
Oh Groups ◽  
Abrasion Loss ◽  
Organic Montmorillonite ◽  
Reinforcing Agent

In this paper, hyperbranched organic montmorillonite (H-OMMT) with hydroxyl (-OH) groups was prepared. The organic montmorillonite (OMMT) was used as a reinforcing agent in NR matrix. The H-OMMT modified natural rubber (NR) had good mechanical properties with the addition of the H-OMMT. Properties, such as tensile strength and abrasion loss, were researched and compared. Results showed that NR/H-OMMT-5% composite had the best tensile and were resistant properties.

scholarly journals Monitoring morphology and properties of hybrid organicinorganic materials from in situ polymerization of tetraethoxysilane in polyimide polymer: 1. Effect of the coupling agent on the microstructure and interfacial interaction

e-Polymers ◽  
2006 ◽  
Vol 6 (1) ◽  
Author(s):  
Hamid Kaddami ◽  
Carsten Becker-Willinger ◽  
Helmut Schmid
Keyword(s):  
Mechanical Properties ◽  
Hybrid Materials ◽  
Coupling Agent ◽  
In Situ Polymerization ◽  
Interfacial Interaction ◽  
Inorganic Materials ◽  
Hybrid Films ◽  
Morphological Transformation ◽  
Temperature Relaxation ◽  
Saxs Analysis

AbstractTransmission electron microscopy (TEM), small angle X-ray (SAXS) and dynamical mechanical thermal analysis (DMTA) were used to characterize the morphology and thermo-mechanical properties of hybrid organic inorganic materials. These materials were based on polyimide (PI) and tetraethoxysilane (TEOS). Polyimide polymer is prepared from 4,4’-oxydianiline (ODA) 2,2-Bis(3- amino-4-hydroxyphenyl) hexafluoro-propane (6F-OHDA) pyromellitic dianhydride (PMDA) polyamic polymer. In one family of hybrid materials 3- isocyanatopropyltriethoxysilane (ICTS) is used as coupling agent in order to enhance the interfacial interaction between polyimide and silica. It was possible to modulate the morphology as well as the optical and thermo-mechanical properties of these hybrid materials depending on the formulation used. TEM and SAXS analysis indicated that silica domains on the nanoscale level are obtained when coupling agent is used in the formulation. Additionally the TEM and SAXS analysis indicated that miscibility of the organic and the inorganic phases on the molecular scale is obtained in the hybrid films when ICTS as coupling agent is added to the polyamic acid. These techniques show a fractal structure of the hybrid materials with coupling agent. This was confirmed with DMTA analysis which shows very high temperature relaxation (more than 450°C). From this result it could be derived that the addition of ICTS causes a morphological transformation from discrete particulate microstructure to fine interpenetrated or co-continuous phases. The intimate miscibility of the phases is accompanied at the same time by the amelioration of thermo-mechanical properties of the hybrid films.

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