Entangled poly vinyl chloride matrices

Considerable research effort has been devoted to the role of sensor and mediator, but relatively little information pertains to PVC save for occasional reference to its molecular mass and the almost obligatory 30 mass % content needed for the mechanical strength of membranes. 

Therefore, the behaviour of eight calcium ISEs with membranes comprising ionophore (4), DOPP and seven standard lUPAC PVCs plus the widely-used reference PVC, Breon III EP, have been examined (Table 3.19). All the master membranes were clear and flexible and (except for Nos. 2, 3, 4 and 6 with M values 40000) non-sticky. In terms of the parameters listed in Table 3.19 there is little to recommend any one PVC type (70). 

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The scope of ion-selective electrodes (ISEs) has been greatly enhanced by employing a poly(vinyl chloride) matrix to entangle sensor cocktail materials. Fbr ISFET devices an in situ photopolymerisation of monobutyl methacrylate provides a viable poly(butyl methacrylate) calcium sensor film with good gate adhesion properties. One or more enzymes can be chemically immobilized on modified nylon mesh. The resultant matrices are suitable for the amperometric assay of carbohydrates in blood and food products. 

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