Sodium perchlorate molecular weight

Ammonium perchlorate is a colorless, crystalline compound having a density of 1.95 g/mL and a molecular weight of 117.5. It is prepared by a double displacement reaction between sodium perchlorate and ammonium chloride, and is crystallized from water as the anhydrous salt. 

The oxocarbenium perchlorate C(CH20CH2CH2C0+C104 )4 was employed as a tetrafunctional initiator for the synthesis of PTHF 4-arm stars [146]. The living ends were subsequently reacted either with sodium bromoacetate or bromoisobutyryl chloride. The end-capping reaction was not efficient in the first case (lower than 45%). Therefore, the second procedure was the method of choice for the synthesis of the bromoisobutyryl star-shaped macroinitiators. In the presence of CuCl/bpy the ATRP of styrene was initiated in bulk, leading to the formation of (PTHF-fc-PS)4 star-block copolymers. Further addition of MMA provided the (PTHF-fr-PS-fc-PMMA)4 star-block terpolymers. Relatively narrow molecular weight distributions were obtained with this synthetic procedure. 

The chemical structures of representative modified cationic polymers are shown in Fig. 4. Representative polymers are aminomethylated acrylamide homopolymer (Mannich modification) with formaldehyde and dimethyl-amine, and Hoffman-decomposed poly(acrylamide) made from the reaction of an acrylamide homopolymer with sodium perchlorate at relatively low temperature. Because the former polymer (Mannich-modified type) does not show molecular weight reduction during modification, high molecular weight modified polymers result. However, the latter example (Hoffman-decomposed type) has a shortcoming molecular weight is... 

Stevens and Schanz (174) used differential scanning calorimetry to study the increase in Tg for complexes of a 4000-molecular-weight polypropylene glycol and lithium perchlorate, lithium triflate, and sodium triflate at various salt concentra-... 

The ASTM and AOCS standards specify determination of molecular weight by titration after addition of mercuric acetate. Mercuric ion complexes halides, resulting in the replacement of halide ions in solution with acetate ion. Acetate is titrated potentiometrically with perchloric acid in acetic acid solvent. The method is valid if a correction is made for the concentration of any halides not associated with the quaternary amine, for example, sodium chloride. 

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