Determination of Organic Isocyanates of Isothiocyanates

Siggia, Sidney.; Hanna, J. G.

doi:10.1021/ac60023a029

Cited by 92 publications

(16 citation statements)

References 2 publications

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“…Determination of the isothiocyanate was carried out according to the method described in the literature [32]. To 3.00 mL of a solution of allyl isothiocyanate and allyl thiocyanate in dry toluene was added 3.00 mL of a ca.…”

Section: Methodsmentioning

confidence: 99%

Experimental and theoretical studies on the isomerization of allyl thiocyanate to allyl isothiocyanate

et al. 1997

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Section: Methodsmentioning

confidence: 99%

Experimental and theoretical studies on the isomerization of allyl thiocyanate to allyl isothiocyanate

et al. 1997

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“…The purity of MDI was higher than 99.9% as determined by the conventional titration method. 10 Poly(tetramethyleneoxide) (PTMO) manufactured by Asahi Chemical Industry Co., Ltd. (Tokyo, Japan) was dehydrated at 90°C/400 Pa. The water content was 15ppm as measured by a moisture meter, Model CA-2 manufactured by Mitsubishi Chemical Industry Co. Ltd. (Tokyo, Japan).…”

Section: Methodsmentioning

confidence: 99%

Segmented Poly(urethane-urea)s Synthesized Directly from Isocyanate-Terminated Prepolymers and Masked Diamines I. Quantitative Synthesis

Yamazaki

Hanahata

Hiwatari

et al. 1997

Polym J

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ABSTRACT:An attempt was made for quantitative synthesis of segmented poly(urethane-urea)s (PUUs), not via solution state, but directly from an isocyanate-terminated prepolymer prepared from an excess molar concentration of 4,4'-methylenediphenyldiisocyanate with poly(tetramethyleneoxide) (M.=2010) and reaction products from acetone and ethylenediamine (EDA) consisting of N-isopropylideneethylenediamine (I), N,N'-diisopropylideneethylenediamine (2), 2,2-dimethylimidazolidine (3) as main product, water, and the unreacted raw materials. With increasing the masking ratio of acetone to EDA, the concentrations of the ketimine groups and water increase while those of the imidazolidine and EDA generally decrease, the molar fraction of the by-product from the reaction of an isocyanate group with water was increased mainly because of the catalytic effect of the ketimine groups. Acetic acid played the significant roll to eliminate the side reaction by accelerating disappearance rate of (I) ((2)) and the quantitative yield of PUU was attained at 40°C when the acid concentration and the masking ratio were 3.50 x 10-3 mo! kg-1 and 1.4, respectively.KEY WORDS Poly(urethane-urea)s / Bulk Polymerization / Quantitative Yield/ Isocyanate-Terminated Prepolymer / Masked Diamines /Water/ Acid/ Segmented poly(urethane-urea)s (PUUs) compose of a class of elastomers exhibiting superior extensibility, toughness and durability over segmented poly(urethane)s and are extensively used in the fields from textile fibers to medical prosthesis.

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“…The purity of MDI thus prepared was higher than 99.9% as determined by the conventional titration method. 7 Poly-(tetramethylene-oxide) (PTMO) manufactured by Asahi Chemical Industry Co., Ltd., Tokyo was dehydrated at 90°Cj400 Pa for 4 h. The water content was reduced to 15ppm as measured by a moisture meter, Model CA-2 manufactured by Mitsubishi Chemical Industry Co., Ltd., Tokyo. The number-average molecular weight, Mn of PTMO was 2010 as determined by the end-group analysis.…”

Section: Materials and Preparation Of Pur Filmsmentioning

confidence: 99%

“…The isocyanate content of the prepolymer was 1.24 mol kg-1 determined by the titration method. 7 After the prepolymer was cooled down to 30°C, the prepolymer (l 00.0 g, 0.124 mol as the isocyanate group concentration) was mixed with the reaction products from EDA, acetone, and water (9.35 g, 0.124 mo! with respect to the amino group concentration calculated based on EDA used) in addition to acetic acid (0.0180g, 3.00x 10-4 mol) under vigorous stirring for 10 sat 30°C and this mixture was immediately placed on a glass plate to obtain a PUR film (ca.…”

Section: Materials and Preparation Of Pur Filmsmentioning

confidence: 99%

Phase Separation Structure of Poly(urethane-urea)s Prepared from Different Manufacturing Methods

Yamazaki¹,

Hanahata²,

Okajima³

1996

Polym J

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Determination of Organic Isocyanates of Isothiocyanates

Cited by 92 publications

References 2 publications

Experimental and theoretical studies on the isomerization of allyl thiocyanate to allyl isothiocyanate

Experimental and theoretical studies on the isomerization of allyl thiocyanate to allyl isothiocyanate

Segmented Poly(urethane-urea)s Synthesized Directly from Isocyanate-Terminated Prepolymers and Masked Diamines I. Quantitative Synthesis

Phase Separation Structure of Poly(urethane-urea)s Prepared from Different Manufacturing Methods

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