Relationships between ringed spherulitic morphology and miscibility in blends of poly(ɛ-caprolactone) with poly(benzyl methacrylate) versus poly(phenyl methacrylate) |
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Authors: | E M Woo T K Mandal S C Lee |
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Institution: | (1) Department of Chemical Engineering National Cheng Kung University Tainan 701-01, Taiwan e-mail: emwoo@mail.ncku.edu.tw Tel.: +886-6-2757575 ext. 62670 Fax: +886-6-2344496, TW |
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Abstract: | Ringed spherulites are an interesting phenomenon that is observed only in very few miscible systems. For the first time,
the relationship between the state of chain intermixing and the ring-band pattern was demonstrated. Two previously demonstrated
miscible blend systems, poly(ɛ-caprolactone) (PCL) with poly(benzyl methacrylate) (PBzMA) and PCL with poly(phenyl methacrylate)
(PPhMA), were studied in order to understand the mechanism of ring-band formation in the spherulites and the relationships
between the ring-band pattern and the state of miscibility. In both miscible PCL/PBzMA and PCL/PPhMA systems, extinction rings
were observed within the PCL spherulites. In the PCL/PBzMA blend, the extinction rings are not as distinct (owing to distortion)
as those in the PCL/PPhMA blend system. Analysis was performed and discussions were made to reveal relationships between miscibility,
interaction strength, and the pattern of the ring bands in the PCL spherulites in polymeric mixtures.
Received: 5 January 2000/Accepted: 14 March 2000 |
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Keywords: | Spherulites Ring bands Interactions Miscibility Poly(ɛ -caprolactone) |
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