Stereoregular Polymer definition of Stereoregular Polymer in the Free Online Encyclopedia.

stereoregular polymer [¦ster·ē·ə′reg·yə·lər ′päl·i·mər]

(organic chemistry)

Stereoregular Polymer

(also stereospecific polymer), any one of the polymers whose linear molecules consists of monomeric units having either identical spatial configurations or configurations that, while not identical, alternate in regular fashion. Stereoregular polymers of the first type include, for example, isotactic polymers’and 1,4-cis- and l,4-trans-polydienes, while those of the second type include syndiotactic polymers.

In many cases, stereoregularity is a necessary condition for realization of a crystalline state. Stereoregular polymers often have an array of mechanical properties that are superior to those of the corresponding nonstereoregular polymers. Stereoregular polymers include isotactic polypropylene, syndiotactic polyvinyl chloride, and stereoregular butadiene rubber, which are produced industrially, and certain natural polymers, such as cellulose and natural rubber.

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No references found	Although stereoregular polymers are generally thought of as homopolymers like polypropylene, the short comonomer runs found in ethylene copolymers are still stereoregular (ref. Comparison of Ziegler-Natta and metallocene ethylene elastomer ... by Williams, M. Glenn / Rubber World Boudreaux (22) described a process for the manufacture of grafted stereoregular polymers of branched higher (alpha-olefins) with relatively high melting points, preferably grafted polymethylpentene containing a thioaliphatic compound. Melt Grafting of Maleic Anhydride Onto Elastomeric Ethylene-Octene ... by Premphet, K.; Chalearmthitipa, S. / Polymer Engineering and Science Both the P-E polymers and stereoregular polymer products exhibit similar behavior. Polyolefin elastomers with isotactic propylene crystallinity by Lohse, D.J. / Rubber World	stereographic chart stereographic coverage stereographic net Stereographic Projection stereoisomer Stereoisomerism stereoisomers stereolithography Stereometer stereomicrography stereomicrometer Stereopair stereophonic Stereophonic Radio Broadcasting stereophonic sound Stereophonic Sound Recording stereophonic sound system stereophonics Stereophotogrammetric Instruments Stereophotogrammetric Survey Stereophotogrammetry Stereoplanigraph Stereoprojector stereopsis stereopticon Stereoregular Polymer Stereoroentgenography stereorubber Stereoscope stereoscopic Stereoscopic Base Length stereoscopic camera Stereoscopic Effect stereoscopic heightfinder Stereoscopic Image stereoscopic imaging stereoscopic microscope Stereoscopic Model Stereoscopic Motion Pictures Stereoscopic Motion-Picture Camera Stereoscopic Motion-Picture Filming Stereoscopic Motion-Picture Projection Equipment stereoscopic pair stereoscopic parallax stereoscopic photography stereoscopic power stereoscopic radius stereoscopic rangefinder stereoscopic system Stereoscopic Television stereoscopic vision	Stereophonic Sound Recording Stereophonic Sound System stereophonic system stereophonically stereophonically Stereophonics stereophony stereophony Stereophotogrammetric Instruments Stereophotogrammetric Survey Stereophotogrammetry stereophotography Stereophotos Stereophotos Stereophotos stereoplanigraph Stereoplasm Stereoprojector stereopsis stereopsis stereopsis Stereoptic Stereoptic Stereoptic stereopticon stereopticon stereopticons stereopticons stereoradiograph stereoradiography Stereoregular Polymer stereoroentenography Stereoroentgenography stereorubber stereos stereos stereoscope stereoscope stereoscope stereoscope An stereoscopes stereoscopes stereoscopes stereoscopic stereoscopic stereoscopic Stereoscopic 3d Stereoscopic 3d Stereoscopic 3d Stereoscopic Base Length stereoscopic camera stereoscopic cover Stereoscopic Effect stereoscopic extraoral radiographic examination stereoscopic extraoral radiographic examination stereoscopic extraoral radiographic examination stereoscopic extraoral radiographic examination Stereoscopic Field of View Stereoscopic goggles Stereoscopic goggles Stereoscopic goggles

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Although stereoregular polymers are generally thought of as homopolymers like polypropylene, the short comonomer runs found in ethylene copolymers are still stereoregular (ref.

Comparison of Ziegler-Natta and metallocene ethylene elastomer ... by Williams, M. Glenn / Rubber World

Boudreaux (22) described a process for the manufacture of grafted stereoregular polymers of branched higher (alpha-olefins) with relatively high melting points, preferably grafted polymethylpentene containing a thioaliphatic compound.

Melt Grafting of Maleic Anhydride Onto Elastomeric Ethylene-Octene ... by Premphet, K.; Chalearmthitipa, S. / Polymer Engineering and Science

Both the P-E polymers and stereoregular polymer products exhibit similar behavior.

Polyolefin elastomers with isotactic propylene crystallinity by Lohse, D.J. / Rubber World

stereographic chart

stereographic coverage

stereographic net

Stereographic Projection