## Abstract **Summary:** A comparison between the crystal structure of isotactic __cis__โ1,4โpoly(1,3โpentadiene) previously predicted by molecular mechanics calculations and that successively determined by other authors by experimental data is reported. The agreement between the two structures is
The crystal structure of 1, 2 isotactic poly-4-methyl-pentadiene-1, 3
โ Scribed by G. Natta; P. Corradini; I.W. Bassi; G. Fagherazzi
- Publisher
- Elsevier Science
- Year
- 1968
- Tongue
- English
- Weight
- 789 KB
- Volume
- 4
- Category
- Article
- ISSN
- 0014-3057
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๐ SIMILAR VOLUMES
Several works have appeared in recent years on the structure of (poly)3MB1 but showing remarkable divergence concerning the crystal lattice of this polymer. Particularly, in a paper by Huguet the structure is interpreted on the basis of a tetragonal lattice, which is here shown to be unacceptable.
## Abstract 3โMethylโ1,3โpentadiene has been polymerized with the Al(C~2~H~5~)~2~Cl/Nd(OCOC~7~H~15~)~3~/Al[CH~2~CH(CH~3~)~2~]~3~ system to crystalline polymers consisting essentially of cisโ1,4 units (โฅ80%). NMR examination has shown that the polymers have an isotactic structure. This conclusion wa
Oriented specimens of isotactic cis-l,4-poly(3-methyl-l,3-pentadiene) exhibit two crystalline modifications characterized, respectively, by the expected two-fobd helical conformation with a fiber repeat of 8,02 A and by a three-fold helix with c = 9,97 A. The latter highly contracted structure is pr
## Abstract 4โMethylโ1,3โpentadiene was polymerized with the MAO/CpTiCl~3~ (MAO: methylโaluminoxane, Cp: Cyclopentadienyl) system to yield a highly stereoregular syndiotactic 1,2โpolymer. Fiber diffraction patterns indicate two crystalline modifications: a major one with a repeat of 11.73 ร and min
R~um~---On a polym6ris6 lc m~thyl-2 pentadi~nc-l,3 trans en un polym~rc cristallin ~ enchainemcnts 1,4 cis h l'aide du systeme catalytique TiCLt-AIRa et en un polym~re cristaUin ~, enchainements 1,4 trans ~t l'aidc du syst~me catalytique Ti (OR)4-VCI3-AIRa. L'action des autres syst~mes catalytiques