National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences, Beijing 100083, People's Republic of China.
J Biomed Mater Res A. 2013 Sep;101(9):2500-6. doi: 10.1002/jbm.a.34552. Epub 2013 Jan 24.
Biodegradable synthetic polymers have attracted much attention nowadays, and more and more researches have been done on biodegradable polymers due to their excellent mechanical properties, biocompatibility, and biodegradability. In this work, hydroxyapatite (HA) particles were melt-mixing with poly (butylenes succinate) (PBS) to prepare the material, which could be used in the biomedical industry. To develop high-performance PBS for cryogenic engineering applications, it is necessary to investigate the cryogenic mechanical properties and crystallization behavior of HA/PBS composites. Cryogenic mechanical behaviors of the composites were studied in terms of tensile and impact strength at the glass transition temperature (-30°C) and compared to their corresponding behaviors at room temperature. With the increase of HA content, the crystallization of HA/PBS composites decreased and crystallization onset temperature shifted to a lower temperature. The diameter of spherulites increased at first and decreased with a further HA content. At the same time, the crystallization rate became slow when the HA content was no more than 15wt% and increased when HA content reached 20wt%. In all, the results we obtained demonstrate that HA/PBS composites reveal a better tensile strength at -30°C in contrast to the strength at room temperature. HA particles with different amount affect the crystallization of PBS in different ways.
可生物降解的合成聚合物如今受到了广泛关注，由于其出色的机械性能、生物相容性和可生物降解性，越来越多的研究致力于可生物降解聚合物。在这项工作中，通过熔融共混法将羟基磷灰石（HA）颗粒与聚丁二酸丁二醇酯（PBS）混合，制备了可用于生物医学领域的材料。为了开发用于低温工程应用的高性能 PBS，有必要研究 HA/PBS 复合材料的低温力学性能和结晶行为。从拉伸强度和冲击强度两个方面研究了复合材料在玻璃化转变温度（-30°C）下的低温力学性能，并与室温下的相应性能进行了比较。随着 HA 含量的增加，HA/PBS 复合材料的结晶度降低，结晶起始温度向低温移动。球晶的直径先增大后减小，当 HA 含量进一步增加时，球晶的直径减小。同时，当 HA 含量不超过 15wt%时，结晶速率变慢，当 HA 含量达到 20wt%时，结晶速率加快。总之，我们的研究结果表明，与室温强度相比，HA/PBS 复合材料在-30°C 时具有更好的拉伸强度。不同含量的 HA 颗粒以不同的方式影响 PBS 的结晶。
