|21 CFR Part 11兼容||Yes|
Product Note, Thermal Analysis, Polymenr Recycling Pack, Polyethylene Terephthalate, PET, polyethylene, PE, Polycarbonate, PC, Polystyrene, PS, Spectrum Two, Fourier Transform Infrared, FT-IR, Universal Attenuated Total Relectance, UATR, High Density Polyethylene, HDPE, Low Density Polyethylene LDPE, Differential Scanning Calorimetry, DSC, Thermogravimetric Analysis, TGA, Thermal Analysis
Product Note, Thermal, Differential Scanning Calorimetry, HyperDSC, UV, Visible, UV/Vis, UV Vis, DSC 8000, DSC 8500, 8000/8500
Many materials have complex molecular structures that areable to exist in more than one crystalline form, a phenomenontermed polymorphism. Different forms may have differentproperties and, for pharmaceutical use, it is important tobe able to produce a pure and stable crystalline form of any material to be used as a drug compound. Using a Differential Scanning Calorimeter (DSC), different forms of such materials may be identified from their melting profiles and differing melting points.
This study shows that DSC can be used to study the curing degree of the EVA resin by measuring the residual curing enthalpy. The data show that the residual curing enthalpy can be correlated to the curing time in a linear way. The DSC test is quick and easy.
幸运8平台彩票Optical adhesives are used in many industries where,solvents are undesirable. Semiconductors and chip,manufacturers for example can not afford solvents,depositing on components. Photo-DSC allows fast analysis,of the curing profile and measurement of the energy of,the curing reactions. Because photo-initiated reactions are fast and energetic,good temperature control and responsiveness are needed to get good data.,Power compensated instruments are the best choice for these applications
Many polymers are semi-crystalline material. The percentage of crystallinity depends on many factors including chemical structure; interaction between polymer chains and processing conditions.
When an aluminum alloy is solution annealed andafterwards cooled too slowly, an exothermal precipitationreaction occurs. With increasing cooling rate, theprecipitation heat decreases. Since the precipitation reaction is relatively fast, a fast cooling rate on the differential scanning calorimeter (DSC) is essential to obtain the critical cooling rate which is the minimum cooling rate at which no precipitation heat is detectable. In this case, it was determined to be 375 (±10) K/min. Such a fast cooling rate can be realized through PerkinElmer’s HyperDSC® technology.
Differential scanning calorimetry (DSC) is a commonly used technique for studying polymeric; pharmaceutical; and energetic; materials. When considering which type of DSC to use to perform a specified measurement one typically chooses either a Power Compensation, or heat flux design.
幸运8平台彩票Many pharmaceutical materials exhibit polymorphism, which means that, depending upon the given processing conditions, the crystalline form may exist in two or more states. The crystalline states or forms exhibit different levels of thermodynamic stabilities and an unstable form can melt at a temperature significantly less than the melting point of the thermodynamically stable form. Depending upon the conditions used to generate the crystalline form(s), the drug may exhibit one or more unstable, polymorphic crystalline states.
幸运8平台彩票Most DSC experiments on polymers are conducted by heating from ambient conditions to above the melting temperature. But, for some thermoplastics, which do exhibit differences during processing, standard heating DSC may not show any significant differences. A more sensitive test, for detecting subtle, but important differences between different batches of a given thermoplastic, is the DSC isothermal crystallization test.
Where ΔCp and ΔCp pure are the changes in specific heat at the glass transition temperature, Tg, for the composite, and for the unfilled polymer, respectively. This work suggests an alternative method for determining Cp that takes advantage of fast heating and cooling rates to obtain quantitative Cp in the upper temperature region without having to dwell in that high temperature region to establish an upper isothermal.
幸运8平台彩票Emulsions constitute an important product class in various industries including the food, chemical and pharmaceutical industries.
幸运8平台彩票Therefore, it is a sensitive test and can be used to show the difference between various batches of material, which may show little difference under a conventional heating experiment. Batches with different crystallization behavior will lead to variation in the quality of the final processed product. For polymer resin manufacture, it can be used for, quality assurance purposes, the optimization of resin formula or the evaluation of a competitor’s resin.
DSC and Raman spectroscopy are both used to investigate crystallinity but in rather different ways. DSC can determine the degree of crystallinity very precisely and can also follow the kinetics of crystallization by measuring the associated enthalpy changes.
DSC and Raman spectroscopy are complementary techniques that are often applied to the same problems, principally to study phase transitions in solids. PerkinElmer’s state-of-the-art double-furnace DSC is heavily used in material characterization.
This application note details the practical aspects of purity determination by differential scanning calorimetry (DSC) and explains the way that the purity calculation works. This will give thermal analysts sufficient information to make successful purity determinations using their calorimeters and understand how to avoid some of the common errors that may be encountered.
幸运8平台彩票StepScan DSC is a temperature modulated,DSC technique that operates in conjunction,with the Power Compensation Diamond,DSC from PerkinElmer. The approach,applies a series of short interval heating,and isothermal hold steps to cover the temperature range of interest. With the,StepScan™ DSC approach, two signals are obtained: the Thermodynamic Cp,signal represents the thermodynamic aspects of the material, while the Iso K,signal reflects the kinetic nature of the sample during heating. The following,basic equation mathematically describes the StepScan DSC approach:
The UV curing of resins is important in materials science. Direct energy measurement and true isothermal operation are essential to a successful UV curing experiment. Since the UV curing reaction is fast, a fast response DSC is needed to capture the process. The double-furnace power-controlled DSC 8000/8500 with UV accessory is the ideal tool to study the UV curing process and to characterize the material properties before and after the UV curing.
在本研究中，使用了一个 HDPE 样品来演示 HyperDSC 的高灵敏度以及检测微弱玻璃化转变的能力。
幸运8平台彩票等温结晶测试已被证明可检测两批次聚丙烯树脂之间的差异，而传统的加热和冷却实验却无法做到这一点。上述信息有助于树脂制造商进行质量保证。带有功率补偿功能的 DSC 8000是进行等温结晶实验的理想工具。 快速的冷却速率和真正的等温操作可提供更为准确的结果。
幸运8平台彩票Modulated Temperature Differential Scanning Calorimetry (MTDSC) is a capability for determining from a single, multi-step DSC method both the specific heat capacity and the heat flow data drom a kinetically controlled process (e.g., reaction or crystallization). PerkinElmer provides this capability with its StepScan software, which is also especially suggested for high accuracy specific heat capacity (Cp) measurement.
Modulated Temperature Differential Scanning Calorimetry, MTDSC, Single and Multi-Step DSC Methods, StepScan, DSC 8500, DSC 8000, Modulated DSC, sinusoidal, Diamond DSC, Pyris 1, SmartScan
A simple experiment is suggested to demonstrate the response time of a DSC and to show how much time is needed for equilibration.
A calorimeter is a device that measures the heat exchange of a sample with its environment. Since heat is usually generated or consumed during a physical transition or chemical reaction; calorimetry is a universal tool to study such processes.
High throughput is a common concern for manufacturing environments. Recently, it has grown in importance for today’s busy research and analytical laboratories as well. Automation can be key to increasing a laboratory’s capabilities while freeing an analyst’s time for other work.
幸运8平台彩票Differential Scanning Calorimetry, DSC, Simultaneious Thermal Analyzers, STA, Thermomechanical Analyzers, TMA, Cooking Accessories, Chillers, Refridgerated Coolers, LN2 Systems, non-cfc, non-chlorofluorocarbon, liquid nitrogen, portable cooling device, cryofill.
幸运8平台彩票The differential scanning calorimeter (DSC) is a fundamental tool in thermal analysis. It can be used in many industries - from pharmaceuticals to polymers and from nanomaterials to food products. The information these instruments generate is used to understand amorphous and crystalline behavior, polymorph and eutectric transitions, curing and degree of cure, and many other material properties used to design, manufacture and test products.
幸运8平台彩票The oxidation induction time (OIT) test following ASTM standard D 6186 or oxidation onset temperature (OT) test can be used to study the oxidation stability of biodiesel. The use of pressure differential scanning calorimetry (DSC) can significantly reduce the experimental time under accelerating conditions. Therefore, pressurized differential scanning calorimetry may be a useful tool to screen different antioxidants or different antioxidant concentrations for biodiesel fuel.