title: Polymorphic transformation of isotactic poly(1-butene) in form III upon heating: in situ synchrotron small- and wide-angle X-ray scattering studies.
abstract: The phase transformation of form III isotactic poly(1-butene) was investigated as a function of temperature. The polymer was isothermally precipitated from a dilute solution in iso-amyl acetate and observed with real-time synchrotron small- and wide-angle X-ray scattering techniques. The results confirmed that the polymorphic transition of form III was strongly dependent on temperature. The phase transformation from form III to form I' proceeded at a temperature of ca. 80 degrees C. This was accompanied by the presence of two distinctly different lamellar periodicities arising from form III and I' crystals, respectively. The coexistence of form III and I' crystals can persist up to 103 degrees C, followed by melting and recrystallizing into form II crystals. Finally, the reflections resulting from form II crystals disappeared at 118 degrees C.
authors.affiliation: State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Renmin Street 5625, 130022 Changchun, P.R. China.
authors.forename: Zhiyong
authors.initials: Z
authors.lastname: Jiang
authors.forename: Yingying
authors.initials: Y
authors.lastname: Sun
authors.forename: Yujing
authors.initials: Y
authors.lastname: Tang
authors.forename: Yuqing
authors.initials: Y
authors.lastname: Lai
authors.forename: Sérgio S
authors.initials: SS
authors.lastname: Funari
authors.forename: Rainer
authors.initials: R
authors.lastname: Gehrke
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Men