Unformatted text preview: Head-to-head linkage is usually the source of instability (thermal, UV, etc.). * Polymer Tacticity (Stero-selectivity) A further possible variable in polymer structure arises from the orientation of side groups along the polymer chain. Isotactic polymer: repetition of the same configuration of repeating units Syndiotactic polymer: alternation of configuration Atactic polymer: a random arrangement n all head-to-tail linkage but there are three tacticities i-PP, s-PP and a-PP Polypropylene (PP) Propylene (1-propene) CH 3 CH 3 CH 3 CH 3 CH 3 CH 3 CH 2 =CH -CH 2-CH-CH 2-CH-CH 2-CH-CH 2-CH-CH 2-CH-...
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- Fall '10
- Polymer, Polymer chemistry, Copolymer, Propylene, copolymer graft copolymer, Syndiotactic