Characterization on mixed-crystal structure of poly(butylene terephthalate/succinate/adipate) biodegradable copolymer fibers
Characterization on mixed-crystal structure of poly(butylene terephthalate/succinate/adipate) biodegradable copolymer fibers
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DOI：
10.1016/j.polymer.2004.11.080
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发表时间：
2005-01
期刊：
影响因子：
4.6
通讯作者：
X. Shi;K. Aimi;Hiroshi Ito;S. Ando;T. Kikutani
中科院分区：
文献类型：
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作者：
X. Shi;K. Aimi;Hiroshi Ito;S. Ando;T. Kikutani
采用1h溶液核磁共振（NMR）表征了理想的无序共聚物聚对苯二甲酸丁二酯/琥珀酸丁二酯/己二酸丁二酯（PBTSA）球团。采用WAXD、固态13c NMR、DSC和拉伸测试等方法研究了纤维的晶体结构和物理性能。在WAXD中只观察到聚对苯二甲酸丁二酯（PBT）样衍射模式；然而，对于脂肪族单元，观察到两种不同的13c自旋晶格弛豫时间（T1C）组分，其中较长的T1C组分分别对应于晶体和非晶畴。因此，PBTSA的晶体结构是由共聚单体混合结晶形成的。这种结晶行为使PBTSA纤维具有良好的pbt样晶体结构，尽管其具有理想的随机性。此外，由于BT晶格中引入了软段（BA和BS）， PBTSA纤维的熔融温度（115℃）比PBT低100℃以上。
Biodegradable poly(butylene terephthalate/succinate/adipate) (PBTSA) pellet, an ideal random copolymer characterized by1H solution NMR, was melt-spun into fibers. The crystal structure and physical properties of the as-spun fibers were investigated by WAXD, solid-state13C NMR, DSC and tensile test measurements. Only poly(butylene terephthalate) (PBT)-like diffraction pattern was observed in WAXD; however, two different13C spin-lattice relaxation time (T1C) components were observed for aliphatic units, in which the longer and the shorter T1Ccomponents correspond to the crystalline and the amorphous domains, respectively. Therefore the crystal structure of PBTSA was concluded to be formed by mixed crystallization of its comonomers. Such crystallization behavior enabled the PBTSA fibers to have well developed PBT-like crystal structure despite of its ideal randomness. Furthermore, due to the introduction of soft segments (BA and BS) into BT crystal lattice, melting temperature of PBTSA fibers (115°C) was over 100°C lower than that of PBT.