Effects of L‐phenylalanine as a nucleation agent on the nonisothermal crystallization, melting behavior, and mechanical properties of poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate)
Effects of L‐phenylalanine as a nucleation agent on the nonisothermal crystallization, melting behavior, and mechanical properties of poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate)
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L-苯丙氨酸作为成核剂对聚(3-羟基丁酸酯-co-3-羟基己酸酯)非等温结晶、熔融行为和力学性能的影响
DOI：
10.1002/app.28240
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发表时间：
2008
影响因子：
3
通讯作者：
Guoqiang Chen
中科院分区：
文献类型：
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作者：
Rongcong Luo;Kaitian Xu;Guoqiang Chen
聚（3-羟基丁酸酯-co-3-羟基己酸酯）（PHBHHx）是一种结晶速度慢的热塑性生物聚酯。采用l -苯丙氨酸（L-PH）提高PHBHHx的结晶速率。采用差示扫描量热法对PHBHHx和PHBHHx/L-PH样品的非等温结晶动力学和熔融行为进行了表征和比较。在冷却速率为2、5、10和208C/min时，PHBHHx/L-PH比纯PHBHHx在更高的温度下结晶。基于修正Avrami方程的分析表明，在冷却速率为108C/min的非等温结晶过程中，L-PH的加入使PHBHHx的半晶时间从9.6 min缩短到8.0 min，使PHBHHx的复合速率常数从0.201提高到0.283。对于其他冷却速率，也观察到类似的变化趋势。这表明在L-PH存在下PHBHHx的结晶速度更快。PHBHHx/L-PH样品比纯PHBHHx样品具有更高的熔融温度和更陡的熔融峰，说明L-PH作为成核剂提高了PHBHHx晶体的完美性。应力应变测量表明，在60天的时效研究中，PHBHHx和PHBHHx/L-PH均保持了其延展性和弹性。2008 Wiley期刊有限公司应用化学学报，2009,31 (2):557 - 557
Poly(3-hydroxybutyrate-co-3-hydroxyhexa- noate) (PHBHHx) is a thermoplastic biopolyester with a slow crystallization rate. L-Phenylalanine (L-PH) was used to improve the crystallization rate of PHBHHx. The noni- sothermal crystallization kinetics and melting behaviors of PHBHHx and PHBHHx/L-PH samples were characterized and compared with differential scanning calorimetry. At cooling rates of 2, 5, 10, and 208C/min, PHBHHx/L-PH could crystallize at higher temperatures than pure PHBHHx. A modified Avrami equation based analysis showed that the addition of L-PH shortened the half-time of crystallization of PHBHHx from 9.6 to 8.0 min and increased the composite rate constant of PHBHHx from 0.201 to 0.283 during the nonisothermal crystallization process at a cooling rate of 108C/min. For other cooling rates, similar trends of changes were observed. These indicated a faster crystallization rate of PHBHHx in the presence of L-PH. PHBHHx/L-PH samples showed a higher melting temperature and a sharper melting peak than those of the pure PHBHHx, which suggested that L-PH as a nucleation agent improved the perfection of the PHBHHx crystals. Stress-strain measurements showed that both PHBHHx and PHBHHx/L-PH maintained their ductile and elastic properties during the 60 days of the aging study. 2008 Wiley Periodicals, Inc. J Appl Polym Sci 110: 2950-2956, 2008
影响因子：
5.5
作者：
Dong, T;He, Y;Inoue, Y
通讯作者：
Inoue, Y
产生生长激素的垂体腺瘤术后照射 18 年后肉瘤转化
DOI：
--
发表时间：
2018
期刊：
影响因子：
--
作者：
岡田正康;米岡有一郎;大石誠;藤井幸彦
通讯作者：
藤井幸彦