By Jacob Bean
The amassing of drawings was once lengthy the province of artists themselves. The Florentine Vasari shaped one of many first substantial and systematic collections of drawings, and his instance was once via Rembrandt, Rubens, Lely, Reynolds, and Lawrence. nice ecu museums—the Uffizi, the Louvre, the Berlin Museum, and the British Museum—have previous and significant collections of drawings. In the US public curiosity in drawings is a reasonably contemporary improvement our public collections have brief histories. That of the Metropolitan Museum is likely one of the oldest within the state, and this is often a result of foresight of Cornelius Vanderbilt.
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Extra info for 100 European Drawings in The Metropolitan Museum of Art
This is known as polymolecularity. p65 39 27/07/01, 10:09 40 FIBROUS POLYMERS The molecular weight of a polymer may be defined in various ways. The usual molecular weight is the number average molecular weight (Eqn 1). 023 ´ 1023). Molecular weight determinations based on end group analysis or the colligative properties of polymers give this type of molecular weight, from which the average value of the DP is obtained. Polymer molecular weights may also be defined by a weight average (Eqn 2). This type of molecular weight is obtained from measurements of light scattering.
These units are often identical. This repetitive structural pattern in polymers was not clearly recognised before about 1925, after the development of much of the technology for dyeing natural and regenerated fibres. A monomer is a simple chemical species whose molecules link to produce a polymer. 1. Because the same structural motif often occurs repeatedly in a polymer molecule, the empirical formula can be deceptively simple, despite the very high molecular weight. For example, the empirical formula for polyacrylonitrile is C3H3N, the same as for the monomer.
They have a significant influence on molecular properties. Even the completely non-polar polyethylene has a fairly high melting point because of the cumulative effect of dispersion forces at many locations along the polymer molecules. The weak dipole and dispersion intermolecular forces discussed above, often collectively referred to as van der Waals forces, are responsible for the non-ideal behaviour of all gases and are intimately involved in the interaction between dye and polymer molecules during dyeing.