Polypropylene isotactic, definition

Synonyms Atactic polypropylene Isotactic polypropylene Polypropene PP Propathene 1-Propene, homopolymer Propene polymer Propene polymers Propylene polymer Syndiotactic polypropylene Classification Thermoplastic polymer Definition Polymer of propylene monomers three forms isotactic (fiber-forming), syndiotactic, atactic (amorphous)... 

The first extensive lUPAC publications on stereochemistry in high polymers were published in the early 1960s, and subsequently in 1966 as a single article (39). In addition to more conventional polymer names, eg, polyethylidene and polypropylene, the -amer nomenclature was introduced in 1952 (10). lUPAC basic definitions relating to stereochemistry, eg, tacticity and isotactic polymer, were published in 1974 (1). 

When propylene or another prochiral 1-olefin is replaced by a chiral 1-olefin such as 3-methyl-1-pentene the stereochemical analysis becomes more complicated. However, when starting with a pure enantiomer the same definition of an isotactic polymer can be valid as for polypropylene, with the additional restriction that all monomeric units have in the side chain an asymmetric carbon atom of a single absolute configuration (Fig. 3). 

This method has been tested on thin films of isotactic polypropylene and may be transferred to other type of radiation-stable optical transparent polymers, where it is possible to change the refractive index at definite doze of gamma-irradiation and their large application in the optical engineering [17, 76]. 

Fillon et al. [30] have defined the so-called domains of self-nucleation for isotactic polypropylene (PP) and we will follow their definitions ... 

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