EFFECT OF COMPOSITION AND PROCESSING CONDITION ON MICROSTRUCTURAL PROPERTIES AND DURABILITY OF FLUOROPOLYMER/ACRYLIC BLENDS

Fluoropolymer blends have been widely used as binders for exterior coatings because of their excellent resistance to ultra-violet (UV) radiation as well as to many corrosive chemical agents.It is known that the fluorinated component usually has a lower glass transition temperature and easily crystallizes in the final structure depending upon the blend composition and sample annealing condition.We investigated the effect of blend composition and annealing process (slow and fast cooling) on the surface mor...     

Theory of the photoacoustic effect of semiconductor quantum wells

We develop a theory of the photoacoustic effect of semiconductor quantum wells. Assuming a multilayer system of optically uniaxial media with dissipation we describe the generation of heat and the conduction of the heat through the system by a generalized transfer-matrix method. It is shown by applying this theory to a semiconductor quantum well that the photoacoustic signal is very sensitive on the quantum-size effect and the longitudinal and transverse relaxation times. Our theory predicts that photoacoustics should be a profitable method for the investigation of semiconductor micro- and nanostructures.     

The total synthesis of (±) compactin and its natural (+) enantiomer

Total synthesis of (±) compactin $\text{12}$ and its natural (+) enantiomer has been achieved via a multistep sequence originating from butadiene and p-benzoquinone.     

Halogenation of C16-macrolide antibiotics 17-haloleucomycins (A3)

The preparation of 17-bromo-, chloro- and fluoroleucomycin A₃ is described. Formation of a new cyclic ether was observed on pyrolysis of the 17-bromo system.     

Decoherence via the dynamical casimir effect

We derive a master equation for a mirror interacting with the vacuum field via radiation pressure. The dynamical Casimir effect leads to decoherence of a superposition state in a time scale that depends on the degree of "macroscopicity" of the state components, and which may be much shorter than the relaxation time scale. Coherent states are selected by the interaction as pointer states.     

A stereoselective total synthesis of (±) prostaglandin E11,2

A stereoselective total synthesis of prostaglandin E₁ employing 5-methoxyindanone-1 as starting material is described.     

A stereoselective total synthesis of nat (−) prostaglandin E1 and its optical antipode

A stereoselective total synthesis of nat (?) prostaglandin E₁ and its optical antipode employing the Diels-Alder adduct oftrans-piperylene and maleic anhydride as starting material is described.