1,721,026 research outputs found
La struttura di monitoraggio scientifico dei cantieri della Venaria Reale. Un approccio multidisciplinare alla comprensione critica dell’architettura storica pp. 320-329, IGIIC, Genova 2004
No full textNanostructured films and templates from self-assembling polystyrene based block copolymers
No full textThe protection of different italian marbles with two partially fluorinated acrylic copolymers
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Photochemical stability of partially fluorinated acrylic protective coatings. IV. Copolymers of 2,2,2-trifluoroethyl methacrylate and methyl alfa-trifluoromethyl acrylate with vinyl ethers
No full textThe photochemical stability of copolymers of 2,2,2-trifluoroethyl methacrylate with butyl vinyl ether (TFEMA/BVE) and of methyl alpha-trifluoromethyl acrylate with 2-ethylhexyl vinyl ether, has been investigated under artificial solar light irradiation. In both copolymers, as well as in a reference ethyl methacrylate/BVE copolymer, the photoageing behaviour is controlled by the reactivity of the corresponding ether component. The degradation occurs mainly in the tertiary positions of the ether units, followed either by formation of gamma-lactones or by chain scissions. Only in the case of TFEMA/BVE does the fluorinated methyl of the side chain have an influence on the degradation pathways, i.e. a clear inhibition of cyclization
Leaf compressions from the late miocene sections of NW Italy: Research on an efficient, easy and quick consolidation treatment
Full text linkCompressions of fossil leaves on marl blocks soaked with water are tricky palaeobotanic findings to deal with. In fact, this peculiarity makes the findings exposed to serious degradation: the evaporation of water causes shrinkage of the matrix and the leaf leading to fragmentation, delamination and exfoliation of the fossil, until its final disappearance. The aim of this research was to identify a consolidation method which satisfies museum needs and can be utilised for all conditions of hydration of the object. Following a survey of several natural science museums in Northern Italy, Paraloid(TM) B72 and PEG4000 along with other resins never previously used on this kind of fossil were tested. At the end of the research, two products gave adequate or good results, preserving the leaf from further degradation whatever the hydration condition of the object: the acrylic resin Paraloid(TM) B72 and a polyurethane resin
Free radical polymerization of unconjugated dienes. 15. Dependence of the composition of poly(methacrylic anhydride) on the monomer concentration
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Free radical polymmerization of unconjugated dienes. 16. Temperature dependence of the cyclization ratio of the cyclopolymerization of methacrylic anhydride.
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