ICCAS OpenIR
Effects of crystal growth conditions on morphology of crystalline syndiotactic 1,2-polybutadiene
Chen, Y; Yang, DC; Hu, YM; Zhang, XQ
2004
Source PublicationCRYSTAL GROWTH & DESIGN
ISSN1528-7483
Volume4Issue:1Pages:117-121
AbstractThe crystalline syndiotatic 1,2-polybutadiene was synthesized with a catalyst consisting of iron acetylacetonate (Fe(acac)(3))-triisobutylaluminum (Al(i-Bu)(3))-diethyl phosphite (DEP), and the effects of crystal growth conditions on morphology of thin films of the polymer were investigated by transmission electron microscopy (TEM) and electron diffraction (ED) techniques. The polymer with melting point 179 degreesC was found to have 89.3% 1,2-content and 86.5% syndiotacticity by C-13 NMR measurement. The results of electron microscopic studies indicate that the solution-cast thin films of the syndiotatic 1,2-polybutadiene consist of lath-like lamellae with the c-axis perpendicular to the film plane, while a- and b-axes are in the film plane. The morphology of isothermally crystallized thin films of the polymer is temperature dependent. At lower crystallization temperatures (130 degreesC), a spherulitic structure consisting of flat-on lamellae is formed. With an increase in the crystallization temperature (e.g., at 140 degreesC), the spherulites and single faceted crystals coexist. At higher crystallization temperatures (150 degreesC), single crystals with a hexagonal prismatic shape are produced. When the crystallization temperature is above 155 degreesC, no crystalline structure is observed because of the thermal cross-linking reaction of the double bonds. The melt-draw films contain highly oriented lamellae with its growing direction perpendicular to the drawing direction. According to the orthorhombic packing of planar zigzag chains, the unit cell parameters calculated from the electron diffraction patterns are a = 1.102 nm, b = 0.664 nm, and c = 0.513 nm.
DOI10.1021/cg0341151
Indexed BySCI
Language英语
WOS IDWOS:000187968300024
PublisherAMER CHEMICAL SOC
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/82236
Collection中国科学院化学研究所
Corresponding AuthorYang, DC
Affiliation1.Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
2.Chinese Acad Sci, Changchun Inst Appl Chem, Polymer Engn Lab, Changchun 130022, Peoples R China
Recommended Citation
GB/T 7714
Chen, Y,Yang, DC,Hu, YM,et al. Effects of crystal growth conditions on morphology of crystalline syndiotactic 1,2-polybutadiene[J]. CRYSTAL GROWTH & DESIGN,2004,4(1):117-121.
APA Chen, Y,Yang, DC,Hu, YM,&Zhang, XQ.(2004).Effects of crystal growth conditions on morphology of crystalline syndiotactic 1,2-polybutadiene.CRYSTAL GROWTH & DESIGN,4(1),117-121.
MLA Chen, Y,et al."Effects of crystal growth conditions on morphology of crystalline syndiotactic 1,2-polybutadiene".CRYSTAL GROWTH & DESIGN 4.1(2004):117-121.
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