可溶性聚醚醚酮改性环氧树脂的研究

采用热熔法制备了一系列可溶性聚醚醚酮(s-PEEK)改性环氧树脂(EP),并与普通聚醚醚酮(PEEK)改性环氧体系进行比较,探讨了聚醚醚酮类型、用量对改性树脂固化体系的凝胶时间、冲击强度、弯曲性能和断裂形貌的影响,并对含 s-PEEK 树脂体系的玻璃化转变温度(T_g)和热稳定性进行了分析。结果表明,s-PEEK 和 PEEK 可在提高环氧体系冲击性能的同时,提高材料的弯曲性能、玻璃化温度和热稳定性;当 m(s-PEEK) ∶ m(E-51)和 m(PEEK) ∶ m(E-51)均为 5 ∶ 100 时,冲击强度达到 42.6 和 46.6 kJ/m²,分别比未改性的环氧体系提高69.1%和85.6%; m(s-PEEK) ∶ m(E-51)=25 ∶ 100 时,T_g=179.1 ℃,比未改性环氧树脂提高20 ℃左右;且含s-PEEK的体系是均相体系,含s-PEEK的固化物是颗粒增强体系。     

PEEK多元复合材料的制备和摩擦学性能

用模压方法制备了Ekonol/G/MoS2/PEEK多元复合材料,通过摩擦磨损实验方法对材料的摩擦学性能进行了研究,并用SEM对磨损表面进行了观察和分析,在此基础上探讨了复合材料的磨损机理。结果表明:用模压法制备Ekonol/G/MoS2/PEEK合材料是可行的;复合材料与PEEK相比,具有优良的摩擦学性能;随着Ekonol含量的增加,复合材料的磨损机理发生了由犁耕、磨粒、粘着磨损向疲劳磨损的转变。图8,参10。     

PEEK对熔融共混PPS／PEEK合金中PPS组份的结晶行为影响的研究

用ＤＳＣ研究了不同ＰＥＥＫ含量不同ＰＥＥＫ粒径对ＰＰＳ／ＰＥＥＫ熔融共混物中组分ＰＰＳ结晶行为的影响。发现ＰＥＥＫ含量增加，ＰＰＳ的Ｔ｜升高，结晶峰宽增加，并由单峰变为双峰。并随ＰＥＥＫ的粒径减小，两相结晶行为相互影响增强，ＰＥＥＫ结晶峰宽变窄，ＴＣＯ和ＴＣ有所降低     

程序控温动态分析对聚醚醚酮结构特征的研究（Ⅱ）探针分子四氢呋喃对PEEK结构的研究

采用程序控温动态分析方法．以四氢呋喃为探针分子，通过考察四氢呋喃分子在ＰＥＥＫ样品上的程序升温解吸（ＴＰＤ）行为，讨论了不同ＰＥＥＫ样品的结构特征．结果发现：探针分子与ＰＥＥＫ的相互作用受ＰＥＥＫ结构特征的影响；由探针分于四氢呋喃与ＰＥＥＫ的作用强度及与ＰＥＥＫ作用的探针分子量，可判断不同ＰＥＥＫ样品分子结构和结晶结构的差异．     

聚醚醚酮热氧化裂解反应动力学研究

本文研究了聚醚醚酮高温热氧化裂解反应动力学。应用热重分析仪并借助电子计算机测定和计算了聚醚醚酮在空气中热裂解反应的表观活化能ΔE 和频率因子(logA)分别为143.1(KJ·mol~(-1))和15.49(A:min~(-1))。并计算了热寿命估算参数。     

Interfacial interaction of carbon fiber/PEEK and its effect on the mechanical performance

An in-depth survey of the researches is presented on the anisotropic structure and properties of interphase in carbon fiber reinforced polyetheretherketone composites. The formation and structural nature of interfacial shortrange and long-range effects, micromechanical and macromechanical roles of interphase are discussed. Besides,prospects of further studies and a novel methodology for revealing interfacial properties of thermoplastic composites are demonstrated     

程序控温动态分析对聚醚醚酮结构特征的研究──（Ⅰ）探针分子苯对聚醚醚酮结构的研究

采用程序控温动态分析方法，并辅之以红外分析手段，探讨了不同合成工艺所得聚醚醚酮样品的结构特征．考察了探针分子苯在不同样品上的程序升温解吸（ＴＰＤ）行为，并与红外分析结果相比较，结果发现：对于不同合成工艺所得的ＰＥＥＫ样品，虽然其红外谱图极为相似．但在分子结构方面仍有一定差异；利用程序控温动态分析方法，可针对这一差异给出有意义的信息，而这些具有理论和实用价值的信息是红外分析方法无法或很难得到的．     

Fabrication and biological evaluation of polyether ether ketone(PEEK)/bioceramic composites

The repair of vascularized bone defects represents a significantly clinical challenge, and vascular regeneration is one of the necessary factors to promote bone tissue regeneration. To effectively repair large bone defects, new bone tissue must regenerate with a rich vascular network. Therefore, the development of biomaterials that can promote the regeneration of vascularized bone tissue is currently receiving attention from researchers. In this study, Li–Ca–Si bioceramics (LCS) containing Li, Ca, and Si elements was developed, then LCS was compounded with PEEK to prepare PEEK+10% LCS, PEEK+20% LCS, PEEK+30% LCS, and the effect of LCS-PEEK composite biomaterials on the proliferation and angiogenic ability of human umbilical vascular endothelial cells (HUVECs) further explored by Cell Counting Kit-8 (CCK-8), scanning electron microscope (SEM), quantitative real-time PCR (QPCR), Western Blotting and enzyme linked immunosorbent assay (ELISA). The results showed that HUVECs inoculated on 30%LCS ?+ ?PEEK material exhibited the best proliferation ability. And the adhesion ability of endothelial cells on PEEK gradually increased with the increase of LCS contents. Furthermore, the angiogenic ability of HUVECs on LCS-PEEK composites was examined using QPCR and Western blotting, and the results showed that the expression of angiogenic-related genes and proteins of HUVECs on PEEK composites gradually increased with increasing LCS concentration. These results demonstrated that the angiogenic ability of HUVECs was effectively stimulated by LCS-modified PEEK materials. The present results indicate that the PEEK material can be modified with bioceramics to promote angiogenesis, and this study lay the foundation for the subsequent development of scaffolds that promote vascularized bone tissue regeneration.     

苯氧离子端基副反应对聚醚醚酮结构和性能的影响

本文用UV,MI,TGA等测试手段,研究聚醚醚酮合成和加工过程中的苯氧离子副反应及其对聚醚醚酮分子结构和性能的影响。