Novel Approaches to Analyze Interior Lamellae in Banded Spherulites of Aliphatic Polyester

• Main Authors: Chi-HsienSu, 蘇紀軒
• Other Authors: Eamor M Woo
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/73612675931126711569

碩士 === 國立成功大學 === 化學工程學系 === 104 === By 3-D SEM observation on the dissected bulk sample of poly(ethylene adipate)(PEA) and poly(butylene adipate)(PBA), which have ability to form double ring-banded morphology, more complete images on polymer self-assembly are obtained. PEA top surface exhibits different width of the ridge caused by the different angle between top bowl-like profile and radially orientation lamellar packing. Interior of the bulk banded PEA sample show discontinuous layer structure seems like onion. Each layer is constituted by radial direction plate-like lamellar attaching cilia-like lamellar and tangential cilia-like lamellar. Tangential cilia-like lamellar will bend in radial direction and combine with plate-like lamellar. The detailed lamellar structures gained from the observation to the bulk sample bring forth the correlation between the interior and top-surface lamellar structures. With better techniques and preparation samples, the wider variation of point of view provided by the 3-D observation offers clearer images than what provided by the 2-D observation. SEM micrographs of PBA banded spherulite also exhibits layered-structure. Each layer composed of tangentially- and radially oriented lamellae though the regularity is lower than PEA banded spherulite. Banding and twisting lamellae are found in the radially oriented layer. This phenomenon caused PBA banded structure more irregular. Both PEA and PBA banded spherulites show multi-layered structure and shape into onion like. The interior micrographs show discontinuous multi-layered structure and prove that banded spherulite is not composed of continuously twisting lamellae from the nucleus to the outer periphery.