Thermal degradation of poly(vinyl chloride). I. Structural effects in the initiation and decomposition chain lengths

Four poly(vinyl chloride) samples containing different structural irregularities were thermally decomposed. The rates of HCl evolution were compared to the rates of radical generation in the samples. Orders of stabilities related to the structural entities for the initiation of decomposition and for the chain lengths of HCl evolution were established.     

Electrochemical behaviour of heterocyclic amidines I. Anodic oxidation of 2-amino-5-ethoxycarbonyl-4-methylthiazole

The behaviour of 2-amino-5-ethoxycrbonyl-4-methylthiazole on oxidation at a rotating platinum disc electrode is reported. The mechanism of the formation of the azo and hydraazo dimeric compounds as main oxidation products is discussed.     

Efficient dynamic kinetic resolution of secondary amines with Pd on alkaline earth salts and a lipase

Combination of Pd, supported on alkaline earth type supports with a lipase results in a selective catalytic system for dynamic kinetic resolution of benzylic amines.     

Lipschitz continuity of state functions in some optimal shaping

We prove local Lipschitz continuity of the solution to the state equation in two kinds of shape optimization problems with constraint on the volume: the minimal shaping for the Dirichlet energy, with no sign condition on the state function, and the minimal shaping for the first eigenvalue of the Laplacian. This is a main first step for proving regularity of the optimal shapes themselves.Received: 11 November 2003, Accepted: 10 May 2004, Published online: 8 February 2005Mathematics Subject Classification (2000): 49Q10, 35R35, 49K20, 35J20