| 单词 | stereoscopist |
| 释义 | stereoscopistenUKster·e·os·co·pyS0744300 (stĕr′ē-ŏs′kə-pē, stîr′-)Stereoregular Polymerstereoregular polymer[¦ster·ē·ə′reg·yə·lər ′päl·i·mər]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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