Fractal and Degradation Process of Biodegradable Polyester Blends
Fractal and Degradation Process of Biodegradable Polyester Blends
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可生物降解聚酯共混物的分形和降解过程
DOI：
10.2115/fiber.54.5_277
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
M. Sumita
中科院分区：
文献类型：
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作者：
K. Inoue;Seigo O;Mun;S. Akasaka;S. Asai;M. Sumita
研究了聚L-乳酸(PLLA)/聚琥珀酸丁二醇酯(PBSU)共混物的碱降解过程及力学性能。DSC测试结果表明，共混物在无定形状态下是不相容的。PLLA/PBSU共混物的伸长率较大(几百%)，而PLLA的伸长率较小(几个百分点)。就碱解试验的重量下降而言，PLLA下降速度最快，PBSU下降速度最慢。PLLA/PBSU 75/25共混物和50/50共混物的降解速率与PLLA相近。在PLLA/PBSU 25/75共混物中观察到重量减轻。可通过在PBSU中共混PLLA来调节降解速率。DSC和WAXD测试结果表明，结晶度的增加非常有限。用扫描电子显微镜观察到降解的纯PLLA中有典型的儿童(分形)状的球状裂纹。降解纯PBSU的表面普遍不平整。在共混物中可以看到特殊的结构(分层混合)。虽然PLLA/PBSU共混物不相容，但共混物具有层次化结构。这可能对材料的力学性能有贡献。
The characteristics of the alkaline degradation process and the mechanical properties of polyester blends of poly (L-lactic acid) (PLLA) and poly (butylene succinate) (PBSU) were studied. The blends were immiscible in the amorphous states from the DSC measurement results. The elongation of PLLA/PBSU blends were large (several hundred percent), however the elongation of PLLA was small (several percent). In regard to the weight decrease of alkaline hydrolysis tests, PLLA had the fastest rate of decrease and PBSU had the slowest rate of decrease. The degradation rate of PLLA/PBSU 75/25 blends and 50/50 blends were close to PLLA. A weight decrease was observed in the PLLA/PBSU 25/75 blends. The degradation rate can be adjusted by blending the PLLA in the PBSU. The results from the measurements of DSC and WAXD showed that the increase of degree of crystallinity was very limited. The characteristic globular cracks of the child (fractal) forms were observed in degraded pure PLLA by means of a scanning electron micrograph. The surfaces with the general unevenness were seen in degraded pure PBSU. The special structures (which were mixed hierarchically) were seen in the blends. Although PLLA/PBSU blends were immiscible, the blends had the structures which were hierarchical. It may contribute to the mechanical properties.