FIELD: chemistry.
SUBSTANCE: method is developed for determination of methylcellulose substitution degree based on the use of disturbed total internal reflection (DTIR) attachment to IR-spectrometer and not requiring any operations for sample preparation and allowing to work just with substances in solid aggregate state. Samples in the form of powders are investigated by spectrometry in the range of (2700-3500) cm-1 and substitution degree (X) is calculated using the formula: where
is ratio of absorption band intensities of valence vibrations of OH and CH, CH2-groups in methylcellulose at υ1=3320 cm-1 and υ2=2850 cm-1;
is ratio of absorption band intensities of valence vibrations of OH and CH, CH2-groups in the initial cellulose at υ1=3410 cm-1 and υ2=2850 cm-1.
EFFECT: method allows to shorten duration of determination of methylcellulose substitution degree, avoid the use of expensive and toxic reagents and also to select the optimum reagent composition for production of methylcellulose with required substitution degree.
1 tbl
Title | Year | Author | Number |
---|---|---|---|
METHOD OF DETERMINING CRYSTALLINITY OF DIPHENYLAMINE-BASED COMPOSITIONS | 2013 |
|
RU2546675C2 |
METHOD OF APPLYING CRUSHED REINDEER ANTLERS AS SORBENTS | 2022 |
|
RU2790060C1 |
METHOD OF DETERMINING ELEMENT COMPOSITION OF POLYMERS AND OLIGOMERS BASED ON 3,3-BIS(AZIDOMETHYL) OXETANE (BAMO) BY METHOD OF IR-SPECTROSCOPY | 2013 |
|
RU2537387C2 |
POLYETHER POLYCARBONATES OF OLIGOLACTIC ACID | 2013 |
|
RU2527471C1 |
ASSESSMENT OF ORGANIC MATTER CONTENT IN OIL-PRODUCING ROCKS CONTAINING TYPE II KEROGEN | 2021 |
|
RU2769531C1 |
COMPOSITION FOR PREPARING COATINGS | 0 |
|
SU1789541A1 |
METHOD OF PRODUCING OXIDISED ISOTACTIC POLYPROPYLENE | 2014 |
|
RU2576329C1 |
N-OXYETHYLHEPTA(OXYETHYLENE)-MORPHOLINE AS CRYOPROTECTOR | 0 |
|
SU1089090A1 |
SUBSTITUTED 2,2'-[(6-METHYLPYRIMIDINE-2,4-DIYL)BIS(3-PHENYL-1N-1,2,4-TRIAZOL-1,5-DIYL)]DIPROPANIC ACIDS AND METHOD OF THEIR PRODUCTION | 2016 |
|
RU2631325C1 |
INFRARED SPECTROSCOPIC EXPRESS METHOD OF DETERMINING QUALITY OF MEDICINAL PLANT MATERIAL | 2012 |
|
RU2493555C1 |
Authors
Dates
2017-02-21—Published
2015-12-16—Filed