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25722-33-2

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25722-33-2 Usage

Chemical Properties

The most significant property of poly-p-xylylene is its thermal stability. The crystalline melting point is 375-425°C and in an inert atmosphere the material is claimed to have a useful life of 10 years at 220°C. The thermal stability in air is not exceptional. Poly-p-xylylene also maintains useful properties at temperatures as low as - 200°C. The polymer has outstandingly good electrical insulation characteristics and is used as a dielectric in special capacitors. It may be noted that poly-p-xylylene is considerably less stable than polyp- phenylene owing to the presence of the relatively weak dibenzyllinkages. It may also be noted that the isomeric polyxylylenes have been prepared but poly-o-xylylene has a polymer melt temperature of 110°C whilst poly-mxylylene has a softening temperature of only 60°C; these polymers are therefore of no immediate interest.

Preparation

When di-p-xylylene is pyrolysed, both methylene bridges are homolytically cleaved to give the reactive intermediate p-xylylene which spontaneously forms the linear polymer on cooling. Generally, the polymer is deposited (in the polymerization chamber) on to a cold condenser and then removed as film; alternatively, the polymer is deposited directly on to an object which is required to be coated. Typically, an average molecular weight of about 500000 is attained.

Check Digit Verification of cas no

The CAS Registry Mumber 25722-33-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,5,7,2 and 2 respectively; the second part has 2 digits, 3 and 3 respectively.
Calculate Digit Verification of CAS Registry Number 25722-33:
(7*2)+(6*5)+(5*7)+(4*2)+(3*2)+(2*3)+(1*3)=102
102 % 10 = 2
So 25722-33-2 is a valid CAS Registry Number.

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25722-33-2Downstream Products

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