Isothermal crystallization of syndiotactic poly(propylene-co-olefin)s

Naofumi Naga, K. Mizunuma, H. Sadatoshi, M. Kakugo

研究成果: Article

27 引用 (Scopus)

抄録

Isothermal crystallization of syndiotactic poly(propylene-co-olefin)s (olefin = ethylene, 1-butene, 1-pentene, 1-hexene, 4-methyl-1-pentene) was studied. The melting behavior of isothermally crystallized polymers was investigated by differential scanning calorimetry, and the equilibrium melting temperature (T(m)0) was determined by Hoffman-Week's plot. Crystallization rate and Avrami exponent of isothermally crystallized copolymers from the melt were measured by depolarized light intensity technique. The half time of crystallization (t( 1/2 )) was found to be dependent on the degree of supercooling (ΔT), but independent of the comonomer. The Avrami exponents (n) of copolymers were detected by the Avrami plot and the average n ranged from 2.0 to 2.8 for the primary crystallization process in any copolymer. The effect of isothermal crystallization temperature (T(c)) on the crystalline structure of copolymers was studied by wide-angle X-ray diffraction (WAXD). The WAXD patterns of all the copolymers were similar to the pattern of Cell II in the syndiotactic polypropylene. The WAXD pattern of 1-butene copolymer with small amount of 1-butene indicated the existence of Cell III.

元の言語English
ページ(範囲)203-209
ページ数7
ジャーナルPolymer
41
発行部数1
DOI
出版物ステータスPublished - 2000 1
外部発表Yes

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Alkenes
Crystallization
Olefins
Polypropylenes
Copolymers
Butenes
X ray diffraction
Diffraction patterns
Supercooling
Melting point
Differential scanning calorimetry
Polymers
Ethylene
Melting
Crystalline materials
1-butene

ASJC Scopus subject areas

  • Organic Chemistry
  • Polymers and Plastics

これを引用

Isothermal crystallization of syndiotactic poly(propylene-co-olefin)s. / Naga, Naofumi; Mizunuma, K.; Sadatoshi, H.; Kakugo, M.

:: Polymer, 巻 41, 番号 1, 01.2000, p. 203-209.

研究成果: Article

Naga, Naofumi ; Mizunuma, K. ; Sadatoshi, H. ; Kakugo, M. / Isothermal crystallization of syndiotactic poly(propylene-co-olefin)s. :: Polymer. 2000 ; 巻 41, 番号 1. pp. 203-209.
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