Aliphatic/aromatic copolyesters containing biobased ¦Ø-hydroxyfatty acids: Synthesis and structure-property relationships

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• 作者：Annamaria Celli ; Paola Marchese ; Simone Sullalti ; Jiali Cai ; Richard A. Gross
• 关键词：¦Ø-Hydroxyfatty acid ; Biobased copolyesters ; Thermo-mechanical properties
• 刊名：Polymer
• 出版年：2013
• 出版时间：8 July, 2013
• 年：2013
• 卷：54
• 期：15
• 页码：3774-3783
• 全文大小：1033 K

文摘

A family of unique aliphatic-aromatic copolyesters was prepared by bulk condensation copolymerizations of bio-derived ¦Ø-hydroxytetradecanoic acid (H) with 1,4-butanediol (B) and dimethyl terephthalate (DMT). ¹H NMR analysis showed the copolyesters have random repeat-unit sequence distributions. Thermal properties strongly depend on molar composition. Melting temperatures are lower than 70?¡ãC for compositions rich in H-units; T_m varies from about 140 to 180?¡ãC for copolymers with high butylene terephthalate (BT) content. Crystal lattice structures shift from the crystal phase of poly(¦Ø-hydroxytetradecanoate) (PH) to that of PBT with increasing BT copolymer content, while the minor component is trapped in the crystallizable domains as defects. The amorphous phase is homogeneous for all compositions and T_g increases from??21?¡ãC (PH homopolymer) to 61?¡ãC (PBT). Also, mechanical properties vary in a continuous way, according to copolymer composition. Therefore, the combination of aliphatic and aromatic units enables molecular design of partially biobased materials with adjustable thermal and physical-mechanical properties. Thus, by judicious selection of copolymer composition, material properties can be fine-tuned to attain the desired balance of material rigidity, ductility, melting point and biobased content.