TY - JOUR
T1 - Phase behavior and crystal morphology in poly(ethylene succinate) biodegradably modified with tannin
AU - Nurkhamidah, Siti
AU - Woo, Eamor M.
AU - Huang, I. Han
AU - Su, Chean C.
N1 - Funding Information:
This work has been financially supported by basic research grants (NSC-96-2221-E-006-011) in three consecutive years from Taiwan’s National Science Council (NSC), to which the authors express their gratitude.
PY - 2011/9
Y1 - 2011/9
N2 - Specific interactions, growth kinetics, and dendritic morphology in poly(ethylene succinate) (PESu) biodegradably modified with various contents of tannic acid (TA) were characterized using differential scanning analysis, Fourier-transform infrared (FTIR) spectroscopy, polarized-light optical microscopy, and atomic force microscopy. Strong interactions and highly retarded growth between PESu and a macromolecular ester with polyphenol groups, TA, interaction-induced highly retarded growth rates for the PESu/TA (80:20) composition are proven to lead to single-crystal-like dendrites when crystallized at high crystallization temperature (T c). At T c∈=∈70 °C, the growth rate for neat PESu is 12 μm/min while it is dramatically depressed to one tenth-fold at 1.5 μm/min with 20 wt.% TA in the blend. Strong specific interactions between the carbonyl group of polyesters and the phenolic hydroxyl group of TA are confirmed by (1) the blend's glass transition temperature (T g)-composition relationship exhibits a sigmoidal curve, well fitted by the Kwei T g model for miscible blends with large negative q∈=∈-90; (2) thermal analysis on crystal melting revealed an interaction parameter χ∈=∈-0.64 between PESu and TA; and (3) IR peak shifting analyzed using two-dimensional FTIR technique. A comparative blend of another polyester poly(hexamethylene sebacate) with TA, lacking the specific interactions, does not exhibit such single crystals upon similar melt crystallization. [Figure not available: see fulltext.]
AB - Specific interactions, growth kinetics, and dendritic morphology in poly(ethylene succinate) (PESu) biodegradably modified with various contents of tannic acid (TA) were characterized using differential scanning analysis, Fourier-transform infrared (FTIR) spectroscopy, polarized-light optical microscopy, and atomic force microscopy. Strong interactions and highly retarded growth between PESu and a macromolecular ester with polyphenol groups, TA, interaction-induced highly retarded growth rates for the PESu/TA (80:20) composition are proven to lead to single-crystal-like dendrites when crystallized at high crystallization temperature (T c). At T c∈=∈70 °C, the growth rate for neat PESu is 12 μm/min while it is dramatically depressed to one tenth-fold at 1.5 μm/min with 20 wt.% TA in the blend. Strong specific interactions between the carbonyl group of polyesters and the phenolic hydroxyl group of TA are confirmed by (1) the blend's glass transition temperature (T g)-composition relationship exhibits a sigmoidal curve, well fitted by the Kwei T g model for miscible blends with large negative q∈=∈-90; (2) thermal analysis on crystal melting revealed an interaction parameter χ∈=∈-0.64 between PESu and TA; and (3) IR peak shifting analyzed using two-dimensional FTIR technique. A comparative blend of another polyester poly(hexamethylene sebacate) with TA, lacking the specific interactions, does not exhibit such single crystals upon similar melt crystallization. [Figure not available: see fulltext.]
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U2 - 10.1007/s00396-011-2479-8
DO - 10.1007/s00396-011-2479-8
M3 - Article
AN - SCOPUS:80052493524
VL - 289
SP - 1563
EP - 1578
JO - Colloid and Polymer Science
JF - Colloid and Polymer Science
SN - 0303-402X
IS - 14
ER -