<p>MIT-World Peace University (MIT-WPU) is a top educational institute located in Pune, India. It is recognized within&nbsp;UGC under Government of Maharashtra Act No. XXXV 2017.&nbsp;</p>

<p>It is part of the MIT group of institutions (established in 1983) which covers 10+ campuses across India and has more than 50,000+ students enrolled across various disciplines at a given point of time. The institute houses 15 schools ranging from Engineering &amp; Technology, Design, Pharmacy, Commerce, Governance among others. It offers undergraduate, postgraduate and PhD programs among different disciplines.&nbsp;</p>

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MIT World Peace University

Engineering and Technology

Polypyrrole molecular composites were prepared by in situ deposition in poly(ethylene oxide) complexes with copper chloride blended with polystyrene. The electrical conductivity of these materials showed some peculiar features such as anisotropy, sharp change with temperature and nonlinear I-V characteristics which were enhanced at a particular composition or certain deposition condition. These various results have been explained on the basis of phase-segregated morphology and a Poole-Frenkel type of conduction process, and are confirmed by detailed studies of the I-V characteristics.

School of Polymer Engineering

World University root node

Synthetic Metals

Charge transport processes in polypyrrole nanoscale composites

The crystallization in polyethylene oxide/polymethyl methacrylate (PEO/PMMA) blends was investigated with respect to composition and different casting solvents. Sharp changes in the intensities of the major reflections (120 and 112/004 from PEO) were observed in their X-ray diffraction scans when these blends were cast from different solvents. Large deviations were noted in the crystallinity values as well as the intensities of the peaks from those expected from simple rules of mixture or dilution law. The various results could be explained on the basis of restricted growth of the PEO crystallites along certain directions in the presence of PMMA. Copyright © 1996 Elsevier Science Ltd.

Polymer

Effect of casting solvent on the crystallization in PEO/PMMA blends

A conducting polymer-based chemical sensor was fabricated by depositing a film containing polyaniline blended with polyethylene oxide and doped with copper chloride onto interdigitated electrodes in a surface cell configuration. It was found to be very sensitive to alcoholic vapours, especially methanol. Its characteristics such as response time (tr), recovery time (td), sensitivity factor (σmax/σ0), etc. have been studied with respect to film composition, chemical vapour dosage, etc. It was found that the sensitivity was maximum and tr minimum at a certain concentration of polyaniline in the film matrix. Although the response was quite fast (tr&lt; 10 s), the recovery was slow and in many cases followed a two-step process. The two components in the recovery were clearly delineated in log-log plots, from which one could be associated with diffusion and the other with selective residual adsorption of the chemical vapour by the conducting polymer moieties. These results have been discussed in the light of the charge transport mechanism and the formation of interfacial barriers between polyaniline domains.

Advanced Materials for Optics and Electronics

Conducting polymer-based chemical sensor: Characteristics and evaluation of polyaniline composite films

The electrical properties of poly(ethylene oxide) gels incorporated with CuCl2 and polypyrrole were investigated with respect to temperature, concentration of CuCl2 and the degree of crosslinking. Highly conducting gels were obtained even at low concentrations of CuCl2 and polypyrrole. The activation energy for conduction and effect of crosslinking and swelling in methanol on the electrical properties strongly indicate the hybrid nature of these materials. The conduction process was predominantly of the electronic semimetallic type with some contribution from ionic mobility. © 1995.

Polypyrrole in poly(ethylene oxide) gels with copper(ii) chloride: a hybrid conducting polymer

The crystallization behavior, modification of crystalline form, and orientation in polypropylene processed by blow film extrusion was studied as a function of processing parameters as well as different types of additives. The isothermal crystallization rate was greatly enhanced in the presence of certain additives, especially CaCO3. The crystalline form was predominantly α type in both compression molded or blow extruded films. However, there was an unusually large intensity of the α040 peak in the X‐ray diffraction of the latter case films. The variation of the peak intensities and the increase of birefringence with increase of take‐up speed has been explained on the basis of orientation induced by uniaxial stress in the machine direction. This orientation contained two components, namely the orientation of the b axis of the crystallites and the orientation of loosely bound polymer chains in the amorphous regions. © 1995 John Wiley &amp; Sons, Inc. Copyright © 1995 John Wiley &amp; Sons, Inc.

Journal of Applied Polymer Science

Structure development in processing of polypropylene films with additives

Dielectric and rheological measurements are reported for the cure in a series of mixtures of an epoxy‐acrylate with n‐butyl methacrylate. The level of the initiator and properties of the epoxy acrylate and n‐butyl methacrylate influence the cure characteristics and morphology of the film formed. Analysis of the rheological data indicates that during the curing process, microphase separation occurs within the mixture. The changes in the dielectric relaxation behavior with composition of the completely cured material is also consistent with microphase separation occurring in these resins while they are cured. Copyright © 1995 Society of Plastics Engineers

Polymer Engineering & Science

Investigation of cure in epoxy acrylate resins using rheological and dielectric measurements

The anisotropy of electrical conductivity has been studied in polypyrrole deposited on poly(ethylene oxide)-copper(II) chloride complex films deposited by the dip-coating technique. The preconditioning of these films has a strong influence on the anisotropy of conductivity and in many cases the conductivity is found to be higher in the perpendicular direction than parallel to the direction of pull. There is also a critical speed of the substrate used during dip coating at which the anisotropy is found to be a maximum. These various results have been explained on the basis of the morphology of the polypyrrole deposit which is influenced by the poly(ethylene oxide) complex and confirmed by deliberate modification of the same complex by blending it with other polymers. © 1995.

Thin Solid Films

Anisotropy of conductivity in polypyrrole deposited on crystalline poly(ethylene oxide)-copper(II) chloride complex and its blend

The changes in viscosity of epoxy–acrylate resins during the photocross‐linking process have been monitored continuously. The curing show change of shape and a distinct peak especially at high intensities. The intensity dependence of gel time follows a superlinear power law of the type tpαI−1.6 rather than the ½ power law. The dielectric relaxation studies on these photocross‐linked films having different compositions of epoxy and n‐butyl methacrylate reveal a particular composition range in which various dielectric parameters pass through critical values. These various findings have been explained on the basis of phase separation taking place during the UV curing process but at a submicron level leading to a very small domain size. © 1994 John Wiley &amp; Sons, Inc. Copyright © 1994 John Wiley &amp; Sons, Inc.

Continuous UV cure monitoring and dielectric properties of photocross‐linked epoxy–acrylate resins

<p>The structure, development, morphology, and dielectric relaxation have been investigated in poly(vinyl chloride)–thermoplastic elastomer (copolyester–ether) blends having different compositions. The changes in the intensities of dielectric relaxation peaks for the β and γ processes with respect to blend composition have been found to be associated with corresponding changes in crystalline structure and morphology of the elastomeric component. The critical composition for observing such modification of properties is about 50% of poly(vinyl chloride) above which the blend becomes almost amorphous. © 1994 John Wiley &amp; Sons, Inc.</p><h2>&nbsp;</h2>