Direct melt crystal growth of isotactic polybutene-1 trigonal phase by Motoi Yamashita and Satoru Ueno

Crystal Research and Technology

Cryst. Res. Technol. 42, 1222 (2007) - Abstract -

Direct melt crystal growth of isotactic polybutene-1 trigonal phase

Motoi Yamashita and Satoru Ueno*

Department of Bioscience and Bioinformatics, Ritsumeikan University, Noji-higashi, Kusatsu, Shiga 525-8577, Japan
*Faculty of Applied Biological Science, Hiroshima University, 1-4-4, Kagamiyama, Higashi-hiroshima, Hiroshima 739-8528, Japan

Keywords	crystallization, melt, isotactic polybutene-1, polymorphs, growth kinetics
PACS	81.05.Lg, 81.10.Aj, 81.10.Fq, 81.10.-h
DOI	10.1002/crat.200711009

The morphology, crystalline structure and crystal growth kinetics of melt-crystallized thin isotactic polybutene-1 films have been studied with transmission electron microscopy, electron diffraction and optical microscopy. It is demonstrated that a bypass of tetragonal phase crystallization and direct melt crystal growth of the trigonal phase can be achieved via self-seeding at atmospheric pressure using solution-grown trigonal crystals as nuclei. Electron microscopy and optical microscopy observations show that melt-crystallized isotactic polybutene-1 single crystals of the trigonal phase have rounded or hexagonal morphologies around 75°C. The growth rate of trigonal crystals in the melt has been obtained by in-situ optical microscopy. The growth rate of trigonal crystals in the melt is 1/100 and 1/1000 that of tetragonal crystals in the melt around 70 and 90°C, respectively.

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