Composition dependence of the thermal behavior, morphology and properties of biodegradable PBS/PTMO segment block copolymer

Yong Huang; Junhong Liu; Tao Zhou; Aimin Zhang

doi:10.1007/s11595-016-1355-2

Journal of Wuhan University of Technology Materials Science Edition ›› 2016, Vol. 31 ›› Issue (1) : 219 -226. DOI: 10.1007/s11595-016-1355-2

Biomaterials

Composition dependence of the thermal behavior, morphology and properties of biodegradable PBS/PTMO segment block copolymer

Yong Huang ¹^,²
, Junhong Liu ²
, Tao Zhou ¹^,^{^c}
, Aimin Zhang ¹^,^{^d}

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Abstract

A series of aliphatic biodegradable poly(ether-ester)s based on poly(butylene succinate) (PBS) as hard segment and poly (tetramethylene oxide) (PTMO, M _n=1 000 g/mol) as soft segment were synthesized. The composition dependence of thermal behavior, morphology and mechanical properties was investigated by differential scanning calorimetry (DSC), atomic force microscopy (AFM), and tensile testing. The crystallization temperature (T _c) and melting temperature (T _m) of the PBS block within poly(ether-ester)s decrease steadily at first, but decrease sharply with PTMO content above 50 wt%. Two crystallization peaks were detected for PTMO in PBSPTMO60 sample, suggesting the occurrence of fractionated crystallization. The crystallization enthalpies (ΔH _c) and melting enthalpies (ΔH _m) of PBS block decrease at first, then increase as PTMO content increases further. AFM has demonstrated that phase-separated morphology transforms from a phase of continuous hard matrix to one of continuous soft matrix containing isolated hard domain as PTMO content is increased. Finally, the results of tensile testing show that the poly (ether-ester)s present the behavior of plastics when PTMO content is below 40 wt%, and of thermoplastic elastomers with PTMO content above 50 wt%. By varying the composition of copolymer, the aliphatic poly (ether-ester)s plastics, or especially biodegradable aliphatic poly(ether-ester)s thermoplastic elastomers can be obtained.

Keywords

poly(ether-ester)s / poly(butylene succinate) / poly (tetramethylene oxide) / thermoplastic elastomers / biodegradable polymer

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Yong Huang, Junhong Liu, Tao Zhou, Aimin Zhang. Composition dependence of the thermal behavior, morphology and properties of biodegradable PBS/PTMO segment block copolymer. Journal of Wuhan University of Technology Materials Science Edition, 2016, 31(1): 219-226 DOI:10.1007/s11595-016-1355-2

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