Abstract:
This invention relates to a process for monitoring polycondensation or polyaddition reactions by measuring the OH, NH or NCO value or acid value of participating reactants by means of infra-red ATR spectroscopy of the associated, temperature-dependent absorption bands and compensating for the temperature dependence by calibrating the self-absorption of the ATR measuring crystal.
Abstract:
The invention relates to low-viscosity polyarylene sulfides (PAS), preferably polyphenylene sulfides (PPS), which are produced with cycloaliphatic, unsaturated acids as molecular weight regulators.
Abstract:
This is invention relates to thermoplastic compositions of polyphenylene sulphide with an addition of silver nitrate which have improved crystallization properties and to a process for their preparation.