The morphology of semicrystalline segmented poly(ether ester) thermoplastic elastomers

Wiley - Tập 182 Số 12 - Trang 3625-3638 - 1981
Zhu Lilan1, Gerhard Wegner1
1Institut für Makromolekulare Chemie, Universität Freiburg, Hermann‐Staudinger‐Haus, Stefan‐Meier‐Str. 31, D‐7800 Freiburg i. Br.

Tóm tắt

AbstractThe supermolecular structure of melt‐crystallized segmented copoly(ether ester)s based on poly(tetramethylene terephthalate) and poly(tetramethylene oxide) is investigated by polarizing microscopy and electron microscopic techniques. Spherulites are formed on isothermal crystallization at supercoolings ΔTu < 30°C. The spherulites recrystallize to form dendritic structures on further annealing at higher temperatures. The spherulites and dendrites are builtup from lamellae which exhibit little variation concerning the thickness of their crystalline core. The internal phase boundaries in these systems are made visible with a newly developed staining method. A network of interlocked individual lamellae is formed on rapid quenching of the melt films. Row crystallization (shish‐kebabs) is observed, if the melt is sheared during the crystallization. It is concluded from these observations that the chemical structure of the segmented copolymers bears little relevance for the supermolecular structure of these materials except for the thickness of the crystalline core of the lamellae which seems to be related to the molecular length of the hard segment sequences occurring with the highest concentration in the sample.

Từ khóa


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Thông tin
Thông tin xuất bản

Wiley

Tập 182 Số 12

3625-3638

Thông tin tác giả