VPIEs

The introduction of phosphate into the framework has led to an extraordinary expansion of the possible pore diameters in framework molecular sieves. The discovery of VPI-5, the first 16-membered-ring aluminophosphate framework, was a landmark (8). Although it is a neutral framework, it... 

Figure 9.3(b) Stator core after vacuum pressure impregnation (VPI)... 

The polymers were prepared using MAA as functional monomer and EDMA as crosslinking monomer if not otherwise noted. VPY= 2- or 4-vinylpyridine TRIM = trimethylolpropane trimethacrylate DPGE = (R)-N,0-dimethacryloylphenylglycinol PYAA = 3-(4-pyridinyl)acrylic acid. 

Considering functional group complementarity, other commodity monomers may also be used. Thus for templates containing acid groups, basic functional monomers are preferably chosen. The 2- or 4-vinylpyridines (VPY) are particularly well-suited for the imprinting of carboxylic acid templates and provide selectivities of the same... 

Shell VPI, Technical Bulletin FC 70 55 TB, Shell Fine Chemicals, London (1977)... 

Nikitin LN (1982) Investigation of the structure and physical properties of Norplast and polyethylene/perlite based compositions, Candidate s thesis. VPI Voronezh... 

All-volatile programs (AVPs) These programs are employed in higher pressure boilers (generally power boilers) and utilize only volatile chemicals, such as ammonia, amines (such as diethylhy-droxylamine or DEHA), and other vapor phase inhibitors (VPIs). 

VPIs can be employed to provide protection to boilers during layup periods, both for dry and wet layup. 

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