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SAXS Studies of Heating/Cooling Cycle Behavior of Biodegradable BTA/PLA‐b Blends
Author(s) -
Kwiatkowski Ryszard,
Dacko Piotr
Publication year - 2010
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201051064
Subject(s) - copolyester , small angle x ray scattering , materials science , lamellar structure , amorphous solid , phase (matter) , composite material , scattering , analytical chemistry (journal) , crystallography , chemistry , organic chemistry , optics , polyester , physics
Summary : The blends of BTA copolyester (i.e. the Ecoflex® copolyester) and PLA‐b amorphous polylactide with following weight ratios: 90/10, 70/30 and 50/50 have been prepared and their phase structure have determined by using X‐ray methods and DSC method. The thermal behavior of the blends was tested by time resolved SAXS measurements performed during heating/cooling thermal cycle treatment (20÷135÷20 °C). As a result of analysis of desmeared Lorentz corrected SAXS curves using the Hosemann scattering function the changes of characteristics of lamellar structure of BT‐BA stacks within the blends have been determined and linked with changes of lamellar superstructure of the BTA reference sample. Among other thinks, it was found that the rate of the heating induced growth of the BA amorphous layers thickness and consequently of long period of BT‐BA stacks structure increases with the increase of PLA‐b amount, and that BT‐BA stacks are formed significantly later (ca. 5 min.) during the cooling of the melted blends than during the cooling of the melted BTA copolyester.