Tuning Radial Lamellar Packing and Orientation into Diverse Ring-Banded Spherulites: Effects of Structural Feature and Crystallization Condition
Spherulite morphologies of a highly asymmetrical double crystallizable poly(ε-caprolactone-b-ethylene oxide) diblock copolymer in solution-cast films were explored from a unified standpoint of tuning radial lamellar organization via controlled evaporation.Besides Maltese cross spherulites, three kinds of ring-banded spherulites that display non-and half-birefringent concentric ringed features as well as extinction banding respectively were first encountered in the same polymer.Structural analyses based on atomic force microscope, transmission electron microscope and grazing incidence X-ray technique revealed that concentric ringed spherulites possess the nature of a rhythmic variation of the radial lamellar packing and extinction banded spherulites have the origin of a periodic change of the radial lamellar orientation.Morphological transitions among different kinds of spherulites were achieved by altering drying condition.PEO segment crystallized at low temperature even if it is being confined by PCL lamellae.Combined with poly(ε-caprolactone) and poly(ethylene adipate), the influences of structural feature and crystallization condition on radial lamellar organization of polymer spherulites were discussed.These present findings are encouraged to enhance our understanding and then governing generation of expected polymer crystal morphology for special material performance.
tribological performance corrosion behavior epoxy coating graphene oxide PTFE
LiYiguo Huang Haiying Wang Zongbao He Tianbai
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry,Chinese Academy of Sciences, Changchun 130022, China;School of Chemistry and Chemical Engineering, Anqing Normal University, Anqing 246011, China;Key Laboratory of Marine Materials and Related Technologies, Zhejiang Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technologies and Engineering, Chinese Academy of Sciences, Ningbo, 315201
国内会议
宁波
英文
396-421
2014-11-11（万方平台首次上网日期，不代表论文的发表时间）