High Molecular Weight Poly(butylene succinate-co-butylene furandicarboxylate) Copolyesters: From Catalyzed Polycondensation Reaction to Thermomechanical Properties

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• 作者：Linbo Wu ; Rosica Mincheva ; Yutao Xu ; Jean-Marie Raquez ; Philippe Dubois
• 刊名：Biomacromolecules
• 出版年：2012
• 出版时间：September 10, 2012
• 年：2012
• 卷：13
• 期：9
• 页码：2973-2981
• 全文大小：567K
• 年卷期：v.13,no.9(September 10, 2012)
• ISSN：1526-4602

文摘

Novel potentially biobased aliphatic鈥揳romatic copolyesters poly(butylene succinate-co-butylene furandicarboxylate) (PBSFs) in full composition range were successfully synthesized from 2,5-furandicarboxylic acid (FA), succinic acid (SA), and 1,4-butanediol (BDO) via an esterification and polycondensation process using tetrabutyl titanate (TBT) or TBT/La(acac)₃ as catalyst. The copolyesters were characterized by size exclusion chromatography (SEC), Fourier transform infrared (FTIR), ¹H NMR, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA), and their tensile properties were also evaluated. The weight average molecular weight (M_w) ranges from 39鈥?00 to 89鈥?00 g/mol. The copolyesters are random copolymers whose composition is well controlled by the feed ratio of the diacid monomers. PBSFs have excellent thermal stability. The glass transition temperature (T_g) increases continuously with _BF and agrees well with the Fox equation. The crystallizability and T_m decrease with increasing butylene furandicarboxylate (BF) unit content (_BF) from 0 to 40 mol %, but rise again at _BF of 50鈥?00 mol %. Consequently, the tensile modulus and strength decrease, and the elongation at break increases with _BF in the range of 0鈥?0 mol %. At higher _BF, the modulus and strength increase and the ultimate elongation decreases. Thus, depending on _BF, the structure and properties of PBSFs can be tuned ranging from crystalline polymers possessing good tensile modulus (360鈥?800 MPa) and strength (20鈥?5 MPa) to nearly amorphous polymer of low T_g and high elongation (600%), and therefore they may find applications in thermoplastics as well as elastomers or impact modifiers.