Department of Organic Chemistry, Faculty of Chemistry, Rzeszow University of Technology, Rzeszów, Poland.
Department of Experimental and Clinical Pharmacology, Faculty of Medicine, The University of Rzeszow, Rzeszów, Poland.
Acta Bioeng Biomech. 2020;22(1):97-110.
Poly(3-hydroxybutyrate) is a biopolymer used to production of implants in the human body. On the other hand, the physical and mechanical properties of poly(3-hydroxybutyrate) are compared to the properties of isotactic polypropylene what makes poly(3-hydroxybutyrate) possible substitute for polypropylene. Unfortunately, the melting point of poly(3-hydroxybutyrate) is almost equal to its degradation temperature what gives very narrow window of its processing conditions. Therefore, numerous attempts are being made to improve the poly(3-hydroxybutyrate) properties. In the present work, hybrid nanobiocomposites based on poly(3-hydroxybutyrate) as a matrix with the use of organic nanoclay - Cloisite 30B and linear polyurethane as a second filler have been manufactured. The linear polyurethane was based on diphenylmethane 4,4'-diisocyanate and diol with imidazoquinazoline rings. The obtained nanobiocomposites were characterized by X-ray diffraction, scanning and transmission electron microscopies, thermogravimetry, differential scanning calorimetry and their selected mechanical properties were tested. The resulting hybrid nanobiocomposites have intercalated/exfoliated structure. The nanobiocomposites are characterized by a higher thermal stability and a wider range of processing temperatures compared to the unfilled matrix. The plasticizing influence of nanofillers was also observed. In addition, the mechanical properties of the discussed nanobiocomposites were examined and compared to those of the unfilled poly(3-hydroxybutyrate). The new-obtained nanobiocomposites based on poly(3-hydroxybutyrate) containing 1% Cloisite 30B and 5 wt. % of the linear of polyurethane characterized the highest improvement of processing conditions. They have the biggest difference between the temperature of degradation and the onset melting temperature, about 100 °C.
聚（3-羟基丁酸酯）是一种用于生产人体植入物的生物聚合物。另一方面，聚（3-羟基丁酸酯）的物理和机械性能与等规聚丙烯的性能进行了比较，这使得聚（3-羟基丁酸酯）有可能成为聚丙烯的替代品。不幸的是，聚（3-羟基丁酸酯）的熔点几乎与其降解温度相等，这使得其加工条件的窗口非常狭窄。因此，人们正在尝试改进聚（3-羟基丁酸酯）的性能。在本工作中，以聚（3-羟基丁酸酯）为基体，采用有机纳米粘土- Cloisite 30B 和线性聚氨酯作为第二填料，制备了混合纳米生物复合材料。线性聚氨酯以二苯基甲烷 4,4'-二异氰酸酯和含咪唑并喹唑啉环的二醇为基础。所得纳米生物复合材料通过 X 射线衍射、扫描和透射电子显微镜、热重分析、差示扫描量热法进行了表征，并测试了其部分力学性能。得到的混合纳米生物复合材料具有插层/剥离结构。与未填充基体相比，纳米生物复合材料具有更高的热稳定性和更宽的加工温度范围。还观察到纳米填料的增塑作用。此外，还研究并比较了讨论中的纳米生物复合材料的力学性能与未填充的聚（3-羟基丁酸酯）的力学性能。基于聚（3-羟基丁酸酯）的新型纳米生物复合材料，其中含有 1% Cloisite 30B 和 5wt.%的线性聚氨酯，其加工条件得到了最大的改善。它们的降解温度和起始熔融温度之间的差异最大，约为 100°C。
