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1.河南工程学院,化工与印染工程学院,郑州 450007
2.河南工程学院,软件学院,郑州 450007
E-mail: wf2003@haue.edu.cn
收稿日期:2025-01-13,
录用日期:2025-02-17,
网络出版日期:2025-03-28,
纸质出版日期:2025-06-20
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王玉杰, 陈科宇, 程国栋, 荆友麒, 刘家甜, 聂慧芳, 王世民, 王非. 羟基磷灰石的异氰酸酯改性及其对热塑性聚氨酯性能的影响. 高分子学报, 2025, 56(6), 992-1001
Wang, Y. J.; Chen, K. Y.; Cheng, G. D.; Jing, Y. Q.; Liu, J. T.; Nie, H. F.; Wang, S. M.; Wang, F. Isocyanate modified hydroxyapatite and its effects on the properties of thermoplastic polyurethane. Acta Polymerica Sinica, 2025, 56(6), 992-1001
王玉杰, 陈科宇, 程国栋, 荆友麒, 刘家甜, 聂慧芳, 王世民, 王非. 羟基磷灰石的异氰酸酯改性及其对热塑性聚氨酯性能的影响. 高分子学报, 2025, 56(6), 992-1001 DOI: 10.11777/j.issn1000-3304.2025.25019. CSTR: 32057.14.GFZXB.2025.7366.
Wang, Y. J.; Chen, K. Y.; Cheng, G. D.; Jing, Y. Q.; Liu, J. T.; Nie, H. F.; Wang, S. M.; Wang, F. Isocyanate modified hydroxyapatite and its effects on the properties of thermoplastic polyurethane. Acta Polymerica Sinica, 2025, 56(6), 992-1001 DOI: 10.11777/j.issn1000-3304.2025.25019. CSTR: 32057.14.GFZXB.2025.7366.
为了改善羟基磷灰石(HA)与热塑性聚氨酯(TPU)的相容性,采用六亚甲基二异氰酸酯(HDI)分别对HA进行一次和二次接枝改性,获得2种异氰酸酯改性HA (NCO@HA和dNCO@HA). 以聚碳酸酯二醇、异佛尔酮二异氰酸酯和1
4-丁二醇为原料合成了TPU基体,并采用溶液共混法制备出基于3种HA和TPU的复合材料. 通过FTIR、XRD、SEM、TGA、接触角测定仪及电子万能试验机,对改性前后的HA及其复合材料进行表征. 结果表明,HDI的―NCO与HA表面的―OH反应生成―NHCOO―,接枝侧链可以在改性HA表面包覆成层,并且改性后HA的晶体结构没有明显变化;受HA与TPU基体间界面相互作用的影响,复合材料的热稳定性优于纯TPU,起始热降解温度提高了约30 ℃,热降解阶段由纯TPU中的两个转变为复合材料中的一个,并且最快热降解速率的温度也随之升高;与表面亲水的HA/TPU相比,改性HA/TPU的疏水性明显提高,与TPU基体相似;NCO@HA/TPU、dNCO@HA/TPU的拉伸强度较HA/TPU分别提高了25.9%、45.7%,断裂伸长率则分别提高了21.9%、45.2%,表明改性HA对复合材料力学性能的增强作用更为明显,此种填料的改性方式有望在以PU为基体的复合材料中得到广泛应用.
To improve the compatibility of hydroxyapatite (HA) and thermoplastic polyurethane (TPU)
hexamethylene diisocyanate (HDI) was employed to modify HA by primary and secondary grafting to obtain isocyanate-modified HA (NCO@HA and dNCO@HA). The TPU matrix was synthesized based on polycarbonate diol
isophorone diisocyanate and 1
4-butanediol
and the composites were prepared separately based on three HA and TPU matrix by solution blending method. The HA before and after modification and their composites were characterized by FTIR
XRD
SEM
TGA
contact angle tester and electronic universal tensile machine. The results indicate that the ―NCO group of HDI reacts with the ―OH group on the surface of HA to generate the ―NHCOO― group
the grafted side chains can be encapsulated into layers on the surface of modified HA
and the crystal structure of modified HA does not change significantly. Affected by the interfacial interactions between HA and TPU
the thermal stability of the composites is better than that of pure TPU
the initial thermal degradation temperature is increased by about 30 ℃. The thermal degradation phase changes from two in the pure TPU to one in the composite
and the temperature of the fastest thermal degradation rate increases. HA/TPU has a hydrophilic surface
while modified HA/TPU has a hydrophobic surface
similar to the TPU matrix. The tensile strengths of NCO@HA/TPU and dNCO@HA/TPU is 25.9% and 45.7% higher than that of HA/TPU
and the elongation at break is 21.9% and 45.2% higher than that of HA/TPU
indicating that the enhancement effect of modified HA on the mechanical properties of composites is more obvious
and the modification of fillers is expected to be widely used in PU-based composites.
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