Papers by Sunil Sabharwal
ACS Symposium Series, 1993
A series of 2-HEMA based polymer matrices having varying degree of microporous structure, crossli... more A series of 2-HEMA based polymer matrices having varying degree of microporous structure, crosslinking and hydrophilicity has been prepared by low temperature radiation induced polymerization. Diltiazem HCl (DTZ. HCl) a calcium channel antagonist was incorporated ...
European Polymer Journal, 2006
Environmental Progress & Sustainable Energy, 2011
High‐energy gamma radiation from 60Co‐gamma radiation source has been used to covalently link acr... more High‐energy gamma radiation from 60Co‐gamma radiation source has been used to covalently link acrylic acid to teflon by mutual radiation grafting technique. Effect of various experimental parameters viz, dose, dose rate, monomer concentration, backbone thickness effect of additives on grafting extent was investigated in order to optimize the conditions for grafting acrylic acid onto teflon to optimum levels. The grafting extent decreased with increasing dose rate and thickness of the substrate while it increased with concentration of acrylic acid and optimum concentration of Mohr's salt. The grafted product was characterized for grafting yield, surface morphology, bulk morphology, and crystallinity change. The SEM studies indicate significant difference in bulk and interface due to change in thickness of the teflon backbone. Dynamic contact angle measurement studies of the grafted and radiation treated teflon showed that initial grafting as well as radiation treatment of teflon ...
Radiation Physics and Chemistry
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Polymers for Advanced Technologies, 2010
ABSTRACT Varying compositions of styrene–butadiene rubber (SBR) and ethylene–propylene diene mono... more ABSTRACT Varying compositions of styrene–butadiene rubber (SBR) and ethylene–propylene diene monomer (EPDM) 50:50 blend containing multiple walled carbon nanotube (MWNT) as nanoparticulate filler (0.5–5%) were prepared and their efficacy for radiation vulcanization was analyzed by gel-content, Charlesby-Pinner parameter, and crosslinking density measurements. Radiation sensitivity of the nanocomposites increased with increase in the MWNT fraction and radiation dose in the dose range studied. The elastic modulus, tensile strength increased with the radiation dose, while elongation at break exhibited downward trend. The extent of reinforcement as assessed using Kraus equation suggested high reinforcement of blend on MWNT addition. The reinforcing mechanism of nanocomposites was studied by various micromechanics models which predicted higher modulus than the experimentally observed results, indicating agglomeration in the nanocomposites. The thermal stability of the composites increased with increase in MWNT loading has been attributed to the antioxidancy induced by nanotubes and higher crosslinking extent of the nanocomposites. Copyright © 2010 John Wiley & Sons, Ltd.
Drug Development and Industrial Pharmacy, 1999
Ocular inserts of gentamicin sulfate with polyvinyl alcohol (PVA) 1.5%, 2.0%, and 2.5% and a comb... more Ocular inserts of gentamicin sulfate with polyvinyl alcohol (PVA) 1.5%, 2.0%, and 2.5% and a combination of methyl cellulose 2% and Eudragit NE 30D 30%, 35%, and 40% w/w of methyl cellulose were fabricated by a casting technique. The inserts were sterilized by gamma radiation at 25 kGy and tested for sterility. The microbiological efficacy of the ocular inserts against Staphylococcus aureus ATCC 6538P and Pseudomonas aeruginosa NCIM 2200 was evaluated by developing an in vitro microbiological model and an in vivo noninvasive rabbit eye model. Parameters of the in vitro microbiological model were varied, and the results correlated with a noninvasive rabbit eye model. The in vitro model proved to be a viable alternative to the rabbit eye model in evaluating the microbiological efficacy of gentamicin sulfate ocular inserts.
Angewandte Chemie International Edition, 2004
ABSTRACT The use of aqueous emulsions as the media when conducting cross-coupling reactions, inst... more ABSTRACT The use of aqueous emulsions as the media when conducting cross-coupling reactions, instead of homogeneous solutions, produces covalently cross-linked conjugated polymer particles (see picture). The size of the spherical particles can easily be tuned over a wide range (mm to nm) by modification of the reaction conditions. The resulting materials are processable in the form of a suspension and promise to have interesting electronic properties.
Journal of Polymer Materials
ABSTRACT
Applied Water Science, 2011
Journal of Applied Polymer Science, 2003
ABSTRACT: Polyampholytic hydrogels, with varying de-grees of crosslinking and ionic content, were... more ABSTRACT: Polyampholytic hydrogels, with varying de-grees of crosslinking and ionic content, were prepared by radiation polymerization of p-sodium styrene sulfonate (SSS) and vinyl benzyl trimethylammoniumchloride (VBT). These gels were investigated for their ...
International Journal of Adhesion and Adhesives, 2013
ABSTRACT Polyurethane (PU) based pressure-sensitive adhesive (PSA) using monofunctional urethane ... more ABSTRACT Polyurethane (PU) based pressure-sensitive adhesive (PSA) using monofunctional urethane acrylate (MFUA) and difunctional urethane acrylate (DFUA) has been cured using electron beam (e-beam) irradiation. The effect of varying e-beam doses on the adhesion properties viz. peel adhesion, shear adhesion and initial tack of PSA has been studied. Effect of various crosslinkers viz. methylene diphenyl di-isocynate (MDI), isophorone di-isocynate (IPDI) and triallyl isocynurate (TAIC) on adhesion properties as well as on moisture vapor transmission rate (MVTR) and gel content of the PSA has also been studied. It was observed that with increasing dose and concentration of crosslinkers all the adhesion properties viz. peel adhesion, shear adhesion strength and initial tack were increased and reached a plateau, and then a decline was observed with further increasing of the dose and crosslinkers concentration. Similarly, MVTR decreased and the gel content increased with increasing dose of electron beam.
Express Polymer Letters, 2009
PM&R, 2022
INTRODUCTION There is a need to better understand the overall state of sub-specialization in phys... more INTRODUCTION There is a need to better understand the overall state of sub-specialization in physical medicine and rehabilitation (PM&R). OBJECTIVE Examine status and trends in subspecialty certification for each of the seven subspecialties approved for American Board of Physical Medicine and Rehabilitation (ABPMR) diplomates. DESIGN/SETTING Retrospective analysis of de-identified information from the ABPMR database. PARTICIPANTS Physicians certified by ABPMR through 2019. INTERVENTIONS Not applicable MAIN OUTCOME MEASURES: For each subspecialty, we examined: a) the number of certificates issued to ABPMR diplomates, b) recertification rate, c) yearly trends for total active, new, and expired certificates, and d) for ABPMR-administered subspecialties, recertification rates for those entering the subspecialty through fellowship completion versus a "grandfathered" practice pathway. RESULTS Of 11,421 ABPMR diplomates in the United States in 2019, 3,560 (31.2%) had a total of 3,985 active subspecialty certificates. Pain Medicine (PM) was the most common subspecialty certification (15.5% of all ABPMR diplomates) followed by Sports Medicine (SM, 6.6%), Brain Injury Medicine (BIM, 4.8%), Spinal Cord Injury Medicine (SCIM, 4.2%), Pediatric Rehabilitation Medicine (PRM, 2.5%), Neuromuscular Medicine (NMM, 0.7%), and Hospice and Palliative Medicine (HPM, 0.5%). For diplomates with more than one subspecialty certification, PM and SM was the most frequent combination. Both the recertification rate and the end of practice track eligibility influenced certification trends for individual subspecialties differently. The average number of new certificates added annually for every subspecialty was higher before the temporary practice track-based eligibility ended than after; the difference was significant (P < .05) for SCIM, PM, SM, and NMM. The recertification rate for all subspecialties combined was 73.4%. For the subspecialties (SCIM, PRM) that this data was available, fellowship candidates had higher recertification rates than those grandfathered through a practice track. CONCLUSION This report informs stakeholders about the state and evolution of subspecialty certification in PM&R over time. This article is protected by copyright. All rights reserved.
The Journal of Spinal Cord Medicine, 2018
American journal of physical medicine & rehabilitation / Association of Academic Physiatrists, Jan 21, 2016
The objective of this study was to examine whether a delay in initially taking the Part I or Part... more The objective of this study was to examine whether a delay in initially taking the Part I or Part II American Board of Physical Medicine and Rehabilitation certification examinations influences the score or passing rates of candidates and whether enrollment in a subspecialty fellowship influences performance on the Part II certification examination. This was a retrospective review of first-time candidates taking the American Board of Physical Medicine and Rehabilitation initial certification examinations from 2010 to 2014. Passing rates declined as candidates delayed the examination past the time of initial eligibility. Passing rates for Part I were as follows (mean [95% confidence interval]): no delay, 91% (89%-94%); 1-yr delay, 68% (56%-82%); and more that 2 yrs' delay, 59% (55%-68%). For Part II, passing rates were as follows: no delay, 90% (85%-94%); 1-yr delay, 83% (72%-94%); and more than 2 yrs' delay, 68% (50%-83%). Those completing an accredited fellowship performed ...
American Journal of Physical Medicine & Rehabilitation, 2015
Journal of Applied Polymer Science, 2009
Radiation Physics and Chemistry, 2005
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Papers by Sunil Sabharwal