Jordi Labs provides a wide range of bench chemical analyses, including titrations, extractions, and other wet chemical methods.
Determination of Crosslink Density, Extent of Crosslinking, Swell Ratio or Gel Fraction
Crosslink density is measured using ASTM D 2765 – 01 as a guidline. This can include determination of the gel content and the swell ratio as desired. Additional information about network parameters can be obtained for specific polymer types using methods such as ASTM F 2214 – 02 "Standard Test Method for In situ Determination of Network Parameters of Crosslinked Ultra High Molecular Weight Polyethylene (UHMWPE)." Specialized methodologies have been developed for testing of other crosslinked polymer systems and are available upon request.
提取物和浸润物测试
如果需要，聚合物样品将是冰冷的，并在指定的时间段内进行肥皂水提取。极性和非极性溶剂可以根据是否需要确定样品中可萃取或可浸出的成分。或者，将样品放入金属线笼中合适的溶剂中，并在指定的时间内提取。残留样品的重量分析用于确定萃取百分比。该技术可以与质量结合以确定提取物种的化学结构。可以进行尖峰研究以确认提取效率。
Gravimetric Analysis
样品准备的分析提取,precipitation, or ashing depending on the quantitation desired. The residual weight is then measured on an analytical balance. Duplicate samples are analyzed to demonstrate the reproducibility of the method.
高温过滤（Filter-H）
该过程包括在高温下使用三氯苯（TCB）的样品过滤（约145 C）。
Karl Fischer Titration
The sample is dissolved in a suitable solvent. The volume of water is then determined by titration using Karl Fischer reagent.
Solid Phase Extraction (SPE)
SPE is a technique used to purify or concentrate an analyte from a sample matrix by selectively retaining and eluting the compounds of interest. This is an excellent method for removal of interferences (unwanted species). Mechanisms for SPE include anion and cation exchange, reversed and normal phase.
Solubility Study
Jordi Labs will attempt to determine a suitable solvent to dissolve your sample. The chemistry of the sample influences solvent choices. Jordi Labs has a large number of specialty solvents for polymer analysis including perfluoro solvents and a wide range of organic and buffer solutions.
Specific Gravity or Relative Density
Specific gravity is a technique used to define the ratio of the density of a given solid or liquid substance to the density of water at a specific temperature and pressure, typically at 4C (39F) and 1 atm. Substances with a specific gravity greater than one are denser than water, and so (ignoring surface tension effects) will sink in it, and those with a specific gravity of less than one are less dense than water, and so will float in it.
滴定器
A wide range of titrations are available including acid/base, hydroxyl number, and various ASTM methods upon request. The sample is placed into a suitable solvent and titrated using the appropriate titrant. The volume of titrant is used to determine the concentration of the titrated species in the solution. Samples are generally run in duplicate to demonstrate reproducibility of the method.
Ultra Filtration
This method allows removal of low molecular weight impurties (<10K) from aqueous solutions. A range of molecular weight cut-offs can be chosen. This method can be used to remove salts, residual monomers or other impurities from polymer solutions. Some alcohol solutions can also be analyzed by this method.
