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Rhythmic Growth-Induced Ring-Banded Spherulites with Radial Periodic Variation of Thicknesses Grown from Poly(epsilon-caprolactone) Solution with Constant Concentration
Wang, Zongbao1; Alfonso, Giovanni C.2; Hu, Zhijun3; Zhang, Jidong1; He, Tianbai1
2008-10-28
Source PublicationMACROMOLECULES
ISSN0024-9297
Volume41Issue:20Pages:7584-7595
AbstractBirefringent ring-banded spherulites with radial periodic variation of thicknesses were grown from poly(epsilon-caprolactone) (PCL) solutions under conditions for which the Solution concentration was held constant during the whole development of the morphology. The as-grown ring-banded spherulites were investigated by optical (OM) and atomic force (AFM) microscopies, by transmission electron microscopy (TEM) of samples sectioned parallel to the plane of film, and also by electron diffraction (ED) and grazing incidence X-ray diffraction (GIXD) techniques. The results indicate that the concentric rings in the birefringent ring-banded spherulites. as well as those in the nonbirefringent ring-banded spherulites, are a manifestation of periodic variation of thicknesses along the radius. The development of the ring-banded spherulites with radial periodic variation of thicknesses is due to periodic diffusion-induced rhythmic growth associated with periodical change in the concentration gradient in polymer solution with constant concentration. The morphological features reflect the competition between the diffusion flux of polymer chains in solution, J, and spherulitic growth with radial growth velocity. V, which call be characterized by the parameter delta = J/V. The effects of crystallization conditions, including polymer molecular weight, initial solution concentration, and solvent evaporation rate, oil the formation of ring-banded spherulites with radial periodic variation of thicknesses were studied.
DOI10.1021/ma8005697
Indexed BySCI
Language英语
WOS IDWOS:000260255800049
PublisherAMER CHEMICAL SOC
Citation statistics
Cited Times:57[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/63162
Collection中国科学院化学研究所
Corresponding AuthorHe, Tianbai
Affiliation1.Chinese Acad Sci, Grad Univ, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China
2.Univ Genoa, Dept Chem & Ind Chem, I-16146 Genoa, Italy
3.Univ Catholique Louvain, Lab Chim & Phys Hauts Polymeres POLY, B-1348 Louvain, Belgium
Recommended Citation
GB/T 7714
Wang, Zongbao,Alfonso, Giovanni C.,Hu, Zhijun,et al. Rhythmic Growth-Induced Ring-Banded Spherulites with Radial Periodic Variation of Thicknesses Grown from Poly(epsilon-caprolactone) Solution with Constant Concentration[J]. MACROMOLECULES,2008,41(20):7584-7595.
APA Wang, Zongbao,Alfonso, Giovanni C.,Hu, Zhijun,Zhang, Jidong,&He, Tianbai.(2008).Rhythmic Growth-Induced Ring-Banded Spherulites with Radial Periodic Variation of Thicknesses Grown from Poly(epsilon-caprolactone) Solution with Constant Concentration.MACROMOLECULES,41(20),7584-7595.
MLA Wang, Zongbao,et al."Rhythmic Growth-Induced Ring-Banded Spherulites with Radial Periodic Variation of Thicknesses Grown from Poly(epsilon-caprolactone) Solution with Constant Concentration".MACROMOLECULES 41.20(2008):7584-7595.
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