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Preparation and characterization of microencapsulated aluminum hypophosphite and its performance on the thermal, flame retardancy, and mechanical properties of epoxy resin
Polymer Composites ( IF 4.8 ) Pub Date : 2021-01-07 , DOI: 10.1002/pc.25937 Yang Li 1 , Juncheng Jiang 1, 2 , Zhiquan Chen 1 , Zhongwei Chen 1 , Lei Ni 1
Polymer Composites ( IF 4.8 ) Pub Date : 2021-01-07 , DOI: 10.1002/pc.25937 Yang Li 1 , Juncheng Jiang 1, 2 , Zhiquan Chen 1 , Zhongwei Chen 1 , Lei Ni 1
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A novel microcapsule flame retardant microencapsulated aluminum hypophosphite (MAHP) was introduced. Fourier transform infrared spectroscopy, scanning electron microscopy, and x‐ray photoelectron spectroscopy were used to characterize the shell material on the surface of MAHP. The water contact angle (WCA) experiments show that the WCA of MAHP (71.4°) is significantly larger than that of aluminum hypophosphite (34.4°). And the interfacial free energy between MAHP and epoxy resin (EP) is only 7.89 mJ/m2, which results in good compatibility with EP. The results from differential scanning calorimeter test indicate that the addition of MAHP can improve the heat resistance of EP matrix. Thermogravimetric (TG) tests show that EP/MAHP has the largest amount of residue (32.03 wt%). The combustion behaviors of flame‐retardant EP (FR‐EP) composites were evaluated by limiting oxygen index, UL‐94, and cone calorimetry. The results show that the microencapsulation to AHP in this study can significantly improve the flame retardancy of EP. Thermogravimetric infrared analysis was used to investigate the gas‐phase products. Surface morphology and structure of char residues of EP and FR‐EP was also studied. The carbon layer became quite dense and continuous when MAHP was added. On the premise of improving the flame retardancy, the mechanical properties of the material are retained. The tensile strength and bending strength of EP/MAHP‐3 were 23.98 and 50.75 MPa, respectively.
中文翻译：
微囊次磷酸铝的制备，表征及其对环氧树脂的热，阻燃和力学性能的影响
介绍了一种新型的微胶囊阻燃剂微囊次磷酸铝（MAHP）。傅里叶变换红外光谱，扫描电子显微镜和X射线光电子能谱用于表征MAHP表面的壳材料。水接触角（WCA）实验表明，MAHP的WCA（71.4°）显着大于次磷酸铝的WCA（34.4°）。MAHP和环氧树脂（EP）之间的界面自由能仅为7.89 mJ / m 2，因此与EP的兼容性很好。差示扫描量热仪测试的结果表明，MAHP的加入可以改善EP基体的耐热性。热重（TG）测试表明，EP / MAHP残留量最大（32.03 wt％）。通过限制氧指数，UL-94和锥形量热法评估了阻燃EP（FR-EP）复合材料的燃烧行为。结果表明，在这项研究中，微囊化AHP可以显着提高EP的阻燃性。热重红外分析用于研究气相产物。还研究了EP和FR-EP的炭残留物的表面形态和结构。当添加MAHP时，碳层变得非常致密且连续。在提高阻燃性的前提下，材料的机械性能得以保留。EP / MAHP-3的拉伸强度和弯曲强度分别为23.98和50.75 MPa。
更新日期：2021-01-07
中文翻译：
微囊次磷酸铝的制备，表征及其对环氧树脂的热，阻燃和力学性能的影响
介绍了一种新型的微胶囊阻燃剂微囊次磷酸铝（MAHP）。傅里叶变换红外光谱，扫描电子显微镜和X射线光电子能谱用于表征MAHP表面的壳材料。水接触角（WCA）实验表明，MAHP的WCA（71.4°）显着大于次磷酸铝的WCA（34.4°）。MAHP和环氧树脂（EP）之间的界面自由能仅为7.89 mJ / m 2，因此与EP的兼容性很好。差示扫描量热仪测试的结果表明，MAHP的加入可以改善EP基体的耐热性。热重（TG）测试表明，EP / MAHP残留量最大（32.03 wt％）。通过限制氧指数，UL-94和锥形量热法评估了阻燃EP（FR-EP）复合材料的燃烧行为。结果表明，在这项研究中，微囊化AHP可以显着提高EP的阻燃性。热重红外分析用于研究气相产物。还研究了EP和FR-EP的炭残留物的表面形态和结构。当添加MAHP时，碳层变得非常致密且连续。在提高阻燃性的前提下，材料的机械性能得以保留。EP / MAHP-3的拉伸强度和弯曲强度分别为23.98和50.75 MPa。
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