@article { ISI:000250698400015, title = {Cholesterol-linked beta-cyclodextrin - a thermotropic liquid-crystalline derivative}, journal = {Bulletin of the Chemical Society of Japan }, volume = {80}, number = {10}, year = {2007}, month = {OCT}, pages = {1975-1980}, publisher = {CHEMICAL SOC JAPAN}, type = {Article}, address = {1-5 KANDA-SURUGADAI CHIYODA-KU, TOKYO, 101-8307, JAPAN}, abstract = {

Liquid-crystalline derivative of ss-cyclodextrin (BCD) was prepared by covalent linking of monocholesteryl succinate (ChMS) with ss-cyclodextrin. To the best of our knowledge, this was first ever attempt so far of its kind, in which BCD has been converted into its liquid-crystalline derivative through covalent linkage of a mesogen. The degree of substitution (DS) obtained was approximate to 2.00. The product was characterized by various techniques, such as FT-IR, NMR, DSC, hot-stage-coupled optical polarizing microscopy (OPM), microanalysis and chemical methods. Cholesterol-linked ss-cyclodextrin (CDCh) derivative was found to exhibit thermotropic liquid-crystalline behavior. The product exhibited birefringence during first heating above 130 degrees C, and it became isotropic at about 180 degrees C, whereas the parent compound BCD decomposed without melting above 250 degrees C. A comparison of CDCh derivative to similar liquid-crystalline polysaccharide derivatives is presented.

}, issn = {0009-2673}, doi = {10.1246/bcsj.80.1975}, author = {Shaikh, Vasi Ahmed Ebrahim and Lonikar, Shrikant Vitthal and Dhoble, Deepa Arun and Pawar, G. M.} } @article { ISI:000245141300021, title = {Controlled synthesis of low-molecular-weight polyethylene waxes by titanium-biphenolate-ethylaluminum sesquichloride based catalyst systems}, journal = {Journal of Applied Polymer Science}, volume = {104}, number = {3}, year = {2007}, month = {MAY}, pages = {1531-1539}, publisher = {JOHN WILEY \& SONS INC}, type = {Article}, address = {111 RIVER ST, HOBOKEN, NJ 07030 USA}, abstract = {

Soluble complexes of titanium(IV) bearing sterically hindered biphenols, such as biphenol, 1,1{\textquoteright}-methylene di-2-naphthol, 2,2{\textquoteright}-methylene bis(4-chlorophenol), 2,2{\textquoteright}-methylene bis(6-tert-butyl-4-ethyl phenol), and 2,2{\textquoteright} ethylidene bis(4,6-di-tert-butyl phenol), were prepared and characterized. These catalyst precursors, formulated as [Ti((OO)-O-boolean AND)X-2], were active in the polymerization of ethylene at high temperatures in combination with ethylaluminum sesquichloride as a cocatalyst. The ultra-low-molecular-weight polyethylenes (PEs) were linear and crystalline and displayed narrow polydispersities. The catalytic polymerization leading to PE waxes in this reaction exhibited unique properties that have potential applications in surface coatings and adhesive formulations. (c) 2007 Wiley Periodicals, Inc.

}, keywords = {Catalysts, polyethylene (PE), synthesis, Ziegler-Natta polymerization}, issn = {0021-8995}, doi = {10.1002/app.25525}, author = {Umare, Prashant S. and Rao, Karumanchi and Tembe, Gopal L. and Dhoble, Deepa Arun and Trivedi, Bhavna} } @article {64}, title = {Polyethylene waxes: catalytic synthesis by ti-biphenolates}, journal = {Journal of Macromolecular Science Part A-Pure and Applied Chemistry}, volume = {44}, number = {7-9}, year = {2007}, month = {JUL}, pages = {977-987}, publisher = {ACADEMIC PRESS INC ELSEVIER SCIENCE}, type = {Article}, address = {525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA}, abstract = {

{Soluble complexes of Ti (IV) bearing biphenol groups such as 1,1{\textquoteright}-binaphthelene 2, 2{\textquoteright} diol (Binol), 1, 1{\textquoteright}-methylene di-2-naphthol, biphenol were prepared and characterized. These catalyst precursors formulated as [

}, keywords = {fibers, Nanoparticles, Self-assembly}, issn = {0021-9797}, author = {Umare, Prashant S. and Rao, Karumanchi and Tembe, Gopal L. and Dhoble, Deepa Arun and Trivedi, Bhavna} } @article {42793, title = {Amino functionalized oligoimides telechelics}, number = {2922/DEL/2010 A}, year = {2010}, month = {AUG}, type = {India Patents}, abstract = {

This invention relates to a process for the preparation of amino functionalized oligoimide telechelics. More particularly it relates to a process for the preparation of soluble oligoimide prepolymers which can be used as matrix resins that can be rapidly cured to form stable polyimides with amino end functionalities. The amino functionalized oligoimide telechelics are suitable for conversion into three dimensional polymeric systems through condensation chemistry such as reaction with oligo epoxies (epoxy-imide resins), polyacids (polyamide imides) and polyhalogenated compounds (poly amine - imides) to form crosslinked structures having enhanced thermal stability and mechanical strength. The polymers prepared by the process of this invention can be used as materials in advanced composites having high temperature stability.

}, author = {Dwivedi, Mayank and Rao, Locanindi Hari Sarvothama and Reddy, Krishna Mohan Srinivasulu and Dhanasekharan, Janakiraman and Rao, Bevara Madhusudana and Kumar, Sriperambudur Rajesh and Ponrathnam, Surendra and Rajan, Chelanattukizhakkemadath Raman and Deokar, Sarika Babasaheb and Mulani, Khudbudin Baban and Ghorpade, Ravindra V. and Bhongale, Sunil Sitaram and Nalawade, Archana Chetan and Sontakke, Kalpana Vishwanathrao and Shaikh, Wasif Abdul Lateef and Chavan, Nayaku and Qureshi, Mohammed Shadbar and Dhoble, Deepa Arun and Mule, Smita Atmaram and Bhosle, Sonali Madhavrao and Momin, Mohasin Shamshuddin} } @article {42779, title = {Amino functionalized oligo polyimides with enhanced storage stability}, number = {EP 11817412 A 20111228}, year = {2012}, month = {JUL}, abstract = {

The invention relates to an improved process for the preparation of amino functionalized oligomeric monomeric reactant type polyimides having higher stability. More particularly it relates to a process for the preparation of soluble imide prepolymers, used as matrix resins that can be rapidly cured with multi-functional moieties such as diepoxy, dicarboxyl, anhydride, diisocyanates to form crosslinked structures having enhanced thermal stability and mechanical strength.

}, author = {Dwivedi, Mayank and Rao, Locanindi Hari Sarvothama and Mohan, Srinivasulu Reddy Krishna and Dhanasekharan, Janakiraman and Rao, Bevara Madhusudana and Kumar, Sriperambudur Rajesh and Ponrathnam, Surendra and Rajan, Chelanattukizhakkemadath Raman and Tayal, Rajiv Kumar and Shadbar, Qureshi Mohammed and Chavan, Nayaku and Deokar, Sarika Babasaheb and Mulani, Khudbudin Baban and Ghorpade, Ravindra V. and Bhongale, Sunil Sitaram and Nalawade, Archana Chetan and Sontakke, Kalpana Vishwanathrao and Bhosle, Sonali Madhavrao and Mule, Smita Atmaram and Dhoble, Deepa Arun and John, Aruldoss and Shaikh, Wasif Abdul Lateef and Harikrishna, Reghunathan and Punitharasu, Vellimala and Momin, Mohasin Shamshuddin} } @article {42782, title = {Ethyl oligo-silicates with strong acid heterogeneous polymeric catalysts}, number = {PCT/IB2011/002531}, year = {2012}, month = {MAY}, type = {Application}, abstract = {

The present invention provides a process for the synthesis of ethyl silicate with varying silica concentration, by hydrolysing ethyl silicate in varying water concentration in the presence of sulfonated catalysts having a styrene-divinyl benzene backbone. The present invention further relates to the preparation of beaded crosslinked polymers containing sulfonic acid moieties having an interconnected pore structure and surface area up to 400 m2 /g.

}, author = {Bevara, Madhusudana Rao and Bhongale, Sunil Sitaram and Bhosle, Sonali Madhavrao and Chavan, Nayaku and Chelanattukizhakkemadath, Raman Rajan and Deokar, Sarika Babasaheb and Dhoble, Deepa Arun and Dwivedi, Mayank and Ghorpade, Ravindra V. and Harikrishna, Reghunathan and Dhanasekharan, Janakiraman and John, Aruldoss and Locanindi, Hari Sarvothama Rao and Momin, Mohasin Shamshuddin and Mulani, Khudbudin Baban and Mule, Smita Atmaram and Nalawade, Archana Chetan and Punitharasu, Vellimalai and Qureshi, Mohammed Shadbar and Kumar, Tayal Rajiv and Shaikh, Wasif Abdul Lateef and Sontakke, Kalpana Vishwanathrao and Reddy, Krishna Mohan Srinivasulu and Sriperambudur, Rajesh Kumar and Ponrathnam, Surendra} } @article { ISI:000356515600001, title = {Long chain branched impact copolymer of polypropylene: microstructure and rheology}, journal = {Polymer Engineering and Science}, volume = {55}, number = {7}, year = {2015}, month = {JUL}, pages = {1463-1474}, publisher = {WILEY-BLACKWELL}, address = {111 RIVER ST, HOBOKEN 07030-5774, NJ USA}, abstract = {

A biphasic impact copolymer of polypropylene (ICP) was modified with peroxide by reactive extrusion process resulting in reduced melt flow index, improved melt strength, and higher die swell. The polymers were for the first time subjected to systematic rheological and microstructural characterization in an effort to understand their structure-property relations. In shear rheological tests, the modified ICP displayed higher flow activation energy, reduced values of loss tangent and nearly equal frequency dependence of storage and loss modulli. The modified ICP also showed strain hardening behaviour in uniaxial extensional rheology and higher crystallization temperature in differential scanning calorimetry (DSC). All these are definitive indications of the presence of long chain branches (LCB). Fitting the rheological data of modified ICPs with the eXtended Pom Pom (XPP) model indicated the presence of LCB on the higher molecular weight fraction in the polymer, a result which was corroborated with multi-detector high temperature gel permeation chromatography (HT-GPC). More importantly, the matrix and rubber phases of the ICP were separately characterized for presence of long chain branching by rheology, DSC and HT-GPC. The results indicate that while LCB existed in the matrix phase, microgels were present in both phases indicating that the reaction with peroxide occurred in both phases. POLYM. ENG. SCI., 55:1463-1474, 2015. (c) 2014 Society of Plastics Engineers

}, issn = {0032-3888}, doi = {10.1002/pen.23993}, author = {Chikhalikar, Kalyani and Deshpande, Anushree and Pol, Harshawardhan and Dhoble, Deepa Arun and Jha, Saroj and Jadhav, Kishor and Mahajan, Sunil and Ahmad, Zubair and Kulkarni, Surendra and Gupta, Surendra and Lele, Ashish K.} } @article { ISI:000380943900048, title = {Proton play in the formation of low molecular weight chitosan (LWCS) by hydrolyzing chitosan with a carbon based solid acid}, journal = {Carbohydrate Polymers}, volume = {151}, year = {2016}, month = {OCT}, pages = {417-425}, publisher = {ELSEVIER SCI LTD}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND}, abstract = {

Low molecular weight chitosan (LWCS) constitute a special class of value added chemicals that are primarily obtained from crustacean shells, which are the main water pollutants from crabs and shrimp processing centers. Unlike chitin and chitosan, LWCS possess improved solubility in water and aqueous solutions, making them widely applicable in numerous fields ranging from drug delivery to waste water treatment. Among the methods employed for their production, chemical breakdown by strong liquid acids has yielded good success. However, this method is met with severe concerns arising from the harsh nature of liquid acids, which may corrode the reactors for commercial synthesis, and their limited reusability. The physical methods like ultrasound and microwave are energy intensive in nature, while the enzymatic methods are expensive and offers limited scope for reuse. We have attempted to overcome these problems by employing carbon based solid acid (CSA) for hydrolyzing chitosan to LWCS. CSA can be easily produced using activated carbon, a cost-effective and easily available raw material. Reactions were carried out between chitosan and CSA in a hydrothermal glass reactor and the products, separated by cold centrifugation, were purified and dried. The dried products were characterized for their molecular weight and solubility. Results indicated more than ten-fold decrease in the molecular weight of chitosan and the product exhibited water solubility. The CSA could be used upto four times, without regeneration, to give a consistent quality product. The aqueous solution of resulting LWCS exhibited a pH of 6.03 +/- 0.11, as against the acidic pH range of solutions of commercially available LWCS, indicating its suitability for biomedical applications. Our investigation facilitates a {\textquoteleft}green approach{\textquoteright} that may be employed for commercial production of value added chemicals from waste products of marine industry. (C) 2016 Elsevier Ltd. All rights reserved.

}, keywords = {Carbon based solid acid, Chitosan, green synthesis, Hydrolysis, Low molecular weight chitosan}, issn = {0144-8617}, doi = {10.1016/j.carbpol.2016.05.082}, author = {Krishnan, R. Akhil and Deshmukh, Pranjal and Agarwal, Siddharth and Purohit, Poorvi and Dhoble, Deepa Arun and Waske, Prashant and Khandekar, Dileep and Jain, Ratnesh and Dandekar, Prajakta} }