Oblique strokes

Irregular polymers or bloeks are named by placing the prefix poly before the structure-based names of the eonstitutional units, collectively enclosed in parentheses or brackets, with the individual eonstitutional units separated by oblique strokes. A typical name derived from this new system is... 

Note 1 The oblique strokes speeify that the sequential arrangement of the constitutional units is unknown. 

Note 3 The oblique stroke drawn between the constitutional units means that the sequential arrangement of these units is irregular or unknown. 

Only the simulant indicated by an X may be used. When X is followed by an oblique stroke and 3 or 5 , the result of the migration tests should be divided by the number indicated, known as the reduction factor . This figure is conventionally used to take account of tbe greater extractive capacity of the simulant for fatty foods compared with other types of foods. 

Catalytic materials are frequently composed of many components and phases. Therefore, it is seldom adequate to define a catalyst by merely stating the chemical composition, e.g. 1% Pt, 99% SiC>2. Note that by convention the support should be indicated clearly by using an oblique stroke (solidue), e.g. 1% Pt/Si02. 

Another approach for representing 2D chemical structures is the linear notation. Linear notations are strings that represent the 2D structure as a more or less complex set of characters and symbols. Characters represent the atoms in a linear manner, whereas symbols are nsed to describe information about the connectivity [3]. The most commonly nsed notations are the Wiswesser line notation (WLN) and the simpUfled molecnlar inpnt line entry specihcation (SMILES) [2]. The WLN, invented by William J. Wiswesser in the 1949, was the hrst line notation capable of precisely describing complex molecnles [4]. It consists of a series of uppercase characters (A-Z), numerals (0-9), the ampersand ( ), the hyphen (-), the oblique stroke (/), and a blank space. 

Wiswesser Line Notation is the first line notation capable of precisely describing complex molecules consisting of a series of uppercase characters, numerals, and symbols (i.e., ampersand, hyphen, the oblique stroke, and a blank space). 

If two monomers are used to make a plastics material then, the resultant product is known as a copolymer. It may be referred to by means of initials which represent the monomers used i.e. without a p for poly . For example, the copolymer (bipolymer) made from styrene and acrylonitrile, is referred to as styrene acrylonitrile copolymer or, as SAN. It is now suggested that an oblique stroke / be placed between the two monomer abbreviations e.g. E/P for an ethylene propylene copolymer. However, this suggestion is not universally adopted as SAN is still SAN the oblique strokes may be omitted when common usage so dictates according to ISO 1043-1 1987 (E). 

An equally acceptable alternative scheme, shown in the last column of Table 3, utilizes the prefix copoly followed by citation of the names of the monomers used, separated from each other by a solidus (oblique stroke). Parentheses are also needed. For example, copoly(styrene/butadiene) denotes an unspecified copolymer of styrene and butadiene. The other connectives of Table 3... 

Left column. Two large well-supported clades (see Fig. 2.3) characterized by initial oblique strokes, enlarged letters in bold and underlining... 

In other cases each section of the battery is designated separately, each designation being separated by an oblique stroke. 

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