Price iptme, loughborough university, loughborough, leics. According to the thermogravimetric analysis results, all of the composites displayed thermal stability up to a temperature of 300 c. Microstructures were observed in a philips xl30 scanning electron. Study on effect of carbonation on storage and stability of pineapple fruit juice written by dnyaneshwar jori, mayur ladole, amol gore published on 201220 download full article with reference data and citations. Thesamplewasheatedfrom0to120 cataheatingrateof10 c min 1, held for 5 min to erase the previous thermal history, cooled to 0 c at a cooling rate of 10 c min 1. Approaches to quantification of amorphous content in crystalline drug substance by powder xray diffraction. The mean droplet diameters of the emulsions were determined by dynamic light scattering with. Quantification of selected essential and toxic elements in royal jelly samples from bulgaria by icpoes and etaas. May 05, 2016 oral and transdermal drug delivery systems. Time influence on palmkernel oil melting behaviour.
Pdf this note describes a number of important food applications utilising the perkinelmer dsc. Characterization studies included content uniformity, microscopy, modulated temperature differential scanning calorimetry mtdsc, gas chromatographymass spectrometry gcms, thermogravimetric analysis tga and rheology. Differential scanning calorimetry dsc is a highly sensitive technique to study. Us6375978b1 rate controlling membranes for controlled. Optimization of equine sperm cryopreservation protocols requires an understanding of the water permeability characteristics and volumetric shrinkage response during freezing. Influence of manufacturing process variables on the. Figure shows the dsc thermograms for cecs, pva and cecspva nanofibers. The differential scanning calorimetry analysis revealed that the poly lactic. Thermal conductivity of ptfe and ptfe composites duncan m. There are several reports about the use of dsc for analysis of oil and lipids. These calculations were therefore, performed using a computer program which could accept data manually or take input directly from a six channel data logger.
Differential scanning calorimetry dsc analysis of latent heat storage. Petrolatum composition and process for its manufacture petrolatum based compositions i. As can be seen from this figure, pure pva samples exhibits a large and sharp endothermic peak at 194c. The activated cokes were characterized with electron probe microanalysis epma, xray photoelectron spectroscopy xps, thermogravimetric analysis tga, and differential scanning calorimetry dsc. Rate dependent finite deformation stressstrain behavior of. Condensed encyclopedia of polymer engineering terms 1st. Foamed samples were sectioned at the midplane using edm and viewed in a low power optical microscope. The differential scanning calorimetry dsc examination required a dsc60 apparatus shimadzu, japan. Similar studies were performed with solid lipid nanoparticles sln prepared from oilwater microemulsions to encapsulate the drug diazepam. Of suitability as petroleum jelly substitute are in particular guerbet alcohol mixtures with a melting range, measured by differential scanning calorimetry dsc, between. All measurements were taken from 80 cto170c, with a temperature ramp rate of 10 cmin.
The degradation process usually occurs in two steps. The ferroelectric properties of single crystals were recorded on a ferroelectric tester precision premier ii made by radiant technologies, inc. To investigate the thermal behavior, mechanical properties and reaction characteristics of the alniptfe composites, an alptfe mixture and an alni mixture were. Differential scanning calorimetry dsc, 84 diluent, 84 distillate, 84 distillation, 85 distillation test, 85 distributive mixing, 86 drawing compound, 87 dry spinning, 87 dynamic demulsibility, 88 dynamic door sealing, 266 dynamic mechanical thermal analysis dmta, 88 elastohydrodynamic ehd lubrication, 89 elasticoviscous fluids, 89. At strain rates of i 03s1 petroleum jelly was confirmed as the.
Differential scanning calorimetry dsc measurements were made using a ta instruments 910 dsc under nitrogen. The instrument was calibrated for temperature and heat flow response. According to the invention, the rate controlling membrane of a controlled drug delivery device is subjected to a pretreatment annealing. The mechanical and thermal behaviour of polymers under high. Scanning electron microscopy images of the surfaces showed good. The dsc thermogram of paracetamol and mixture of paracetamol and mucilage cvm are shown in fig.
Ijms free fulltext thermal stability and rheological. Differential scanning calorimetry tests were performed either on a thermal advantage dsc q ta instruments, inc. Netherlands and paraffin oil gustav heess, leonberg, germany were used. The crystallization theory of pure pmp had been well studied based on its molecular structure. Crystallization and compatibility of poly4methyl1pentene. Mechanical properties, the fracture morphology, melting and crystallization behavior, and melt flow rate of pmp and pmpelastomer blends were investigated by universal testing machine, differential scanning calorimeter, scanning electron microscopy, and melt flow indexer. A cellshapeindependent differential scanning calorimeter dsc technique was used to measure the volumetric shrinkage during freezing of equine sperm suspensions at cooling rates of 5cmin and 20cmin in the. Cold hardiness and deep supercooling in xylem of shagbark. We have more than 25 years of expertise solving and preventing complex problems for companies in the medical, pharmaceutical, packaging, aerospace, defense, and manufacturing industries.
Saxs and waxs, respectively, differential scanning calorimetry. Also thermocouples were inserted into some specimens compressed at high strain rates in order to measure any rises in. Preparation and thermal properties of fatty alcohol. Described herein are mixed ethers and cosmetic andor pharmaceutical preparations comprising mixed ethers. A predictive model for polyethylene cable insulation. The thermal stabilities were studied by differential scanning calorimetry dsc q2000 under nitrogen atmosphere. The composite pcm was prepared by heating 45 g of petroleum jelly and 5 g of paraffin wax in a beaker. Chemically treated borneo sago metroxylon sagu starch. The differential scanning calorimetry analysis revealed that the poly lactic acidsago composites treated with benzene diazonium chloride had the highest melting point. At strain rates of i 03s1 petroleum jelly was confirmed as. Xray crystallographic data the crystal structures were determined on a. The set of rheological tests and calorimetric analysis that were performed on a real waxy crude oil confirm that a gel formed with waxy crystals may evolve with time.
The differential scanning calorimetry dsc measurment of polymorph ii figure s11. Various sources of petrolatum and tob, and two mixing methods were employed to generate q1q2 equivalent ointments. This compatibility requirement can be analysed by differential scanning calorimetry dsc 1. In differential scanning calorimetry dsc analysis for degree of gelatinization determination, the sample is usually hydrated to ratio 2 to 1. Materials free fulltext investigation on the thermal. Pdf practical food applications of differential scanning calorimetry. It is verified that the irradiated polycarbonate presents, in relation to as received material, an. The characterization of synthesized nepcm was done by differential scanning calorimetry, scanning electron microscope and dynamic light scattering. It is a mixture of hydrocarbons, yellowish or whitish, gelatinous, semisolid, amorphous mass obtained from petro. Differential scanning calorimetry to 90c of intact buds indicated that bud tissues of the cultivar with the poorest response to cryopreservation had the highest residual water content at the end of the desiccation process and froze at the highest temperature keywords.
According to another aspect, the membranes have enhanced permeability. The dsc technique becomes insensitive at conversions shortly after the gel point 345. Samples of about 10mg, sealed in aluminum pans, were submitted to a heatingcooling cycle from. In this work, ni nickel was added to alptfe composites for the purpose of improving the energy density and damage effect. Rate dependent finite deformation stressstrain behavior. Study on toughening of poly4methyl1pentene with various. Differential scanning calorimetry dsc821e, mettler toledo, columbus, oh, usa experiments were performed on the organic ink and its constituents over a temperature range from 100 to 100. Dsc is particularly suitable for analysis of food systems because they are often subject to heating. Study on effect of carbonation on storage and stability of pineapple fruit juice written by dnyaneshwar jori, mayur ladole, amol gore published on 201220 download. Purchase condensed encyclopedia of polymer engineering terms 1st edition.
Examples of nonfood applications include hydrogelsbased starches, which are usually applied in pharmaceutical and biomedical applications liestianty et al. Thermal conductivity of ptfe and composites 10 which is the quantity we wish to measure. Effects of o2 on characteristics of sulfur added to petroleum. Differential scanning calorimetry the melting point of paracetamol is reported to be 169170. The instrument was calibrated for temperature and heat flow response according to the melting points and heats of fusion of pure gallium, indium, tin and bismuth. This invention provides rate controlling membranes for controlled drug delivery devices that are stable over time and exhibit more predictable and consistent membrane functionality. However, it has sensory negatives perceived by consumers. A cellshapeindependent differential scanning calorimeter dsc technique was used to measure the volumetric shrinkage during freezing of equine sperm suspensions at cooling rates of 5cmin and 20cmin in the presence and absence of cryoprotective agents cpas, i. The mechanical and thermal behaviour of polymers under. Sgs polymer solutions incorporated sgs psi is an independent materials testing lab and strategic resource for the testing of polymers, plastics, and organic and inorganic substances. From the above it can be seen that working out lfor each sample by hand would be very laborious.
Jan 01, 2002 a cellshapeindependent differential scanning calorimeter dsc technique was used to measure the volumetric shrinkage during freezing of equine sperm suspensions at cooling rates of 5cmin and 20cmin in the presence and absence of cryoprotective agents cpas, i. Thixotropic ethylcellulose oleogels in triglyceride oils. Full text oral and transdermal drug delivery systems. Analysis of variance, using transformed data, was used to detect significant differences in water content, and a. The present invention provides rapamycin polymorph form ii. Another requirement is the chemical and physical compatibility. Thermal properties of nepcm were studied by using differential scanning calorimetry dsc q20, ta instrument. Wo2012041737a2 petrolatum composition and process for. The presence of a glass transition in the differential scanning calorimetry profile of the material would serve as proof of the presence of amorphous material.
Differential scanning calorimetry dsc, using a netzsch 404 dsc, was used. These data are shown in figure 2 and summarized in. Also, we describe here the most extensive applications of dsc in. The level of the petroleum jelly for pxrd sample preparation is. Quickly and effectively cleans up even the most persistent leftovers. Differential scanning calorimetry dsc is a technique in which the difference in the amount of heat required for. Compression testing uniaxial compression tests were performed over a wide range. For the eaa polymer material with the highest acid content, there was a synergistic effect. Differential scanning calorimetry an overview sciencedirect topics. Ageing of rubbery thermoplastic barley and oat starches. The mre samples were cooled from an ambient temperature to.
Wo2012041737a2 petrolatum composition and process for its. The synthesized sample nepcm was heated from 0 c to 80 c at a heating rate of 5 c per minute. Comparison of microstructural and physical properties of. Comparison of microstructural and physical properties of two petroleum waxes. Sharp peaks such as the first order geltoliquid crystalline phase transition l. This invention also provides processes for preparing rapamycin polymorph form ii and pharmaceutical compositions including rapamycin polymorph form ii.
Approaches to quantification of amorphous content in. Me6032 is an insulation compound for dry core and petroleum jelly filled cables. Ageing of rubbery thermoplastic barley and oat starches free download as pdf file. Sago starch is known for its hydrophilicity, biocompatibility, and. Then, the heating and cooling processes were operated again.
As thermooxidative degradation of pe is accompanied by significant release of heat it can also be studied by differential scanning calorimetry dsc. Small crosssections of hickory xylem approximately 2 mmin height and. Plastics differential scanning calorimetry dsc part 1. Differential scanning calorimetry contribution to a better. Differential scanning calorimetry dsc diluent distillate distillation distillation test. Effects of o2 on characteristics of sulfur added to. Hereunder material characteristics like surface tension, polarity, wetting behaviour and the molecular weight of the materials are of importance. Astms petroleum standards are instrumental in the evaluation and assessment of the physical, mechanical, rheological, thermal, and chemical properties of crude oils, lubricating grease, automobile and aviation gasoline, hydrocarbons, and other naturally occurring energy resources used for various industrial applications. Aug 22, 20 of suitability as petroleum jelly substitute are in particular guerbet alcohol mixtures with a melting range, measured by differential scanning calorimetry dsc, between. In this study, the crystallization behavior and compatibility of pmppolypropylene pp blends were investigated by differential scanning calorimetry, xray diffraction, scanning electron microscopy sem, and mechanical testing. Petroleum coke was activated in so 2 with and without o 2 in a packed bed reactor at 600. Five 5 mg of lyophilized extract was mixed in a ratio of 1. Differential scanning calorimetry is performed by raising the temperature of the insulator from 5 to 100.
Investigation of the functionality of white soft paraffin with regards to ointments phillip john bentley submitted in accordance with the requirements for the degree. Condensed encyclopedia of polymer engineering terms. The thermograms of drug and mucilage of cydonia vulgaris pers. Study on effect of carbonation on storage and stability of. Thermal analysis of petroleum products sciencedirect.
Alptfe aluminumpolytetrafluoroethene is regarded as one of the most promising reactive materials rms. Johannes karl fink, in petroleum engineers guide to oil field chemicals and fluids, 2012. An experimental investigation on the evaporation of. Phillip john bentley submitted in accordance with the.
Polymer solutions incorporated psi is an independent materials testing lab and strategic resource for the testing of polymers, plastics, metals, gases, and much more. The effect of oil content on the physical properties of five microcrystalline waxes having widely different oil content have been investigated. Synthetic sapphire was used as a reference material for heat capacity. Liquid crystal lc dosage forms, particularly those using lipidbased lyotropic lcs llcs, have generated considerable interest as potential. We have more than 30 years of expertise solving and preventing complex problems for companies in the medical, pharmaceutical, packaging, aerospace, defense, and.