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388625-44-3

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388625-44-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 388625-44-3 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 3,8,8,6,2 and 5 respectively; the second part has 2 digits, 4 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 388625-44:
(8*3)+(7*8)+(6*8)+(5*6)+(4*2)+(3*5)+(2*4)+(1*4)=193
193 % 10 = 3
So 388625-44-3 is a valid CAS Registry Number.

388625-44-3Downstream Products

388625-44-3Relevant articles and documents

Facile manufacture and storage of poly(methylhydrogenosiloxane)s

Yactine, Bassem,Ganachaud, Francois,Senhaji, Omar,Boutevin, Bernard

, p. 2230 - 2236 (2005)

This paper describes the ring-opening polymerization of 2,4,6,8-tetramethylcyclotetrasiloxane (D4H) in miniemulsion, using mono- and diphosphonic acid surfactants. In the simplest formulation conditions, polymerization proceeds in less than 15 min to generate linear poly(methylhydrogenosiloxane) (PMHS) of large molar masses (typical number-average of 25 kg/mol), of low polydispersities (around 2), and in good yields (up to 94%), Molar masses can be tuned at will since for similar conversions but increasing times, Mn varies between 10 and 30 kg/mol. After 4 h reaction, some redistribution reactions start to proceed, responsible for PMHS chains switching into macrocycles. It was shown that rising the pH to stop the polymerization and breaking the emulsion with excess of alun salt induced hydrolysis/condensation reactions, which rapidly convert the polymer chains into an unwished macrogel. Rather, extracting the polymer by simple centrifugation and using the diacid surfactant induce a physical gelling that very efficiently suppresses side reactions, as shown by minor evolution of the molar mass distribution for 10 months.

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