摘要:
A method of quantitatively measuring the concentration of a chemical species in a sample solution with a sensor film. A hydrogel sensor film is prepared having a chemical composition comprising an indicator that changes its optical property in the ultra-violet, visible or near-infrared spectral range upon being exposed to the chemical species in the sample solution. The film is exposed to a fixed amount of the sample solution. The concentration of the chemical species in the sample solution is quantified using the average absorbance measured from the sensor film.
摘要:
A method of quantitatively measuring the concentration of a chemical species in a sample solution with a sensor film. A hydrogel sensor film is prepared having a chemical composition comprising an indicator that changes its optical property in the ultra-violet, visible or near-infrared spectral range upon being exposed to the chemical species in the sample solution. The film is exposed to a fixed amount of the sample solution. The concentration of the chemical species in the sample solution is quantified using the average absorbance measured from the sensor film.
摘要:
A method of quantitatively measuring the concentration of a chemical species in a sample solution with a sensor film. A hydrogel sensor film is prepared having a chemical composition comprising an indicator that changes its optical property in the ultra-violet, visible or near-infrared spectral range upon being exposed to the chemical species in the sample solution. The film is exposed to a fixed amount of the sample solution. The concentration of the chemical species in the sample solution is quantified using the average absorbance measured from the sensor film.
摘要:
Polychlorinated biphenyl compounds are sorbed from aqueous solutions and mixtures by a variety of organic polymeric materials. The contaminant can be desorbed for further processing and destruction.
摘要:
A method for separating volatile organic compounds (VOCs), such as trichloroethylene, from air by sorption followed by desorption of the VOCs. The VOCs from the contaminated ground water are air stripped and then sorbed on a sorbent, such as a polyester elastomer or carbon filled rubber. The VOCs are then desorbed by, for example, heating the sorbent, to recover the VOCs. The recovered VOCs may be incinerated or reused.
摘要:
Carbonyl-capped polyphenylene ether is reacted with a cycloalkene, such as cyclooctene using an organometallic catalyst, such as tungsten (VI) chloride/ethyl aluminum dichloride, to produce polyarylene ether/polyoctenamer block copolymers.
摘要:
Polyphenylene ethers are capped by reaction in the melt, with application of vacuum, with at least one trimellitic anhydride salicylate, ester, preferably the 4-(phenyl salicylate) ester. The preferred melt processing method is extrusion with vacuum venting. By this method, the polyphenylene ether is capped with reactive dicarboxylate groups and also with salicylate groups, improving its thermal stability. The capped polyphenylene ether is capable of forming copolymers with polyamides, and said copolymers are useful as compatibilizers for polyphenylene ether-polyamide blends.
摘要:
Polyphenylene ethers are capped by reaction in the melt, with application of vacuum, with at least one trimellitamide, preferably phenyl 4-aminosalicylate trimellitamide. The preferred melt processing method is extrusion with vacuum venting. By this method, the polyphenylene ether is capped with reactive anhydride groups improving its thermo-oxidative stability. The capped polyphenylene ether is capable of forming copolymers with polyamides, and said copolymers are useful as compatibilizers for polyphenylene ether-polyamide blends.
摘要:
Polyphenylene ethers are capped by reaction in the melt, with application of vacuum, with at least one trimellitic anhydride salicylate ester, preferably the 4-(phenyl salicylate) ester. The preferred melt processing method is extrusion with vacuum venting. By this method, the polyphenylene ether is capped with reactive dicarboxylate groups and also with salicylate groups, improving its thermal stability. The capped polyphenylene ether is capable of forming copolymers with polyamides, and said copolymers are useful as compatibilizers for polyphenylene ether-polyamide blends.
摘要:
Carboxylated polyphenylene ethers are prepared by reaction of the polyphenylene ether with an ester such as a 4-alkyl or 4-aryl ester of trimellitic anhydride. The methyl, ethyl and o-carbophenoxyphenyl esters are preferred; the latter caps the polyphenylene ether in addition to carboxylating it. The reaction takes place in the presence of a triaryl phosphite, at a temperature in the range of about 225.degree.-350.degree. C.