Synthesis, characterization and biodegradability of the biodegradable aliphatic-aromatic random copolyesters

Cited 145 time in webofscience Cited 0 time in scopus
  • Hit : 625
  • Download : 5
Two series of biodegradable aliphatic-aromatic random copolyesters (PBCSTs) were synthesized by polycondensation. Specifically, we controlled the molar ratio of diols (1.4-butane diol, 1.4-cyclohexane dinnethanol:CHDM) as well as that of diacids (succinic acid, dimethyl terephthalate:DMT) in order to investigate both the degradation behavior and the light transparency improvement of the final products. According to DSC observation, the melting temperature decreased gradually as more CHDM was added, and no melting temperature was observed when more than 20% of CHDM was used. Using 500 Mhz H-1 NMR, we noticed that succinic acid has the same reactivity as DMT. However, in diols, the composition of CHDM was richer than its feed. We also observed that the introduction of CHDM improved the transparency of the samples even though it deteriorated the mechanical properties slightly. In the hydrolytic degradation, the S70 series samples of which have more succinic units in their main chain, showed better degradability than S50 series samples at pH 10 and pH 7. Furthermore, S70C40 and S50C40 which contain much CHDM showed faster hydrolytic degradation than other samples because of their rich amorphous phase. In the composting experiment, in all samples, we found stains, which were the trace of growing microorganisms, on the their surfaces. Even S50C20 samples, which showed the lowest weight loss, showed severe surface degradation by the attack of microorganisms. Using simple empirical degradation models, we evaluated the effect of the crystallinity and the hydrophilicity. (C) 2000 Elsevier Science Ltd. All rights reserved.
Publisher
ELSEVIER SCI LTD
Issue Date
2001-03
Language
English
Article Type
Article
Keywords

HYDROLYTIC DEGRADATION; BLENDS; POLY(ETHYLENE-TEREPHTHALATE); POLYESTERS; COMPOST

Citation

POLYMER, v.42, no.5, pp.1849 - 1861

ISSN
0032-3861
URI
http://hdl.handle.net/10203/5144
Appears in Collection
CBE-Journal Papers(저널논문)
Files in This Item
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 145 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0