Preparation and properties of melamine-formaldehyde rigid closed-cell foam toughened by ethylene glycol/carbon fiber

IF 1.3 4区 医学 Q4 MATERIALS SCIENCE, BIOMATERIALS Cellular Polymers Pub Date : 2020-06-04 DOI:10.1177/0262489320929232
Chunhui Li, Haihong Ma, Zhengfa Zhou, Weibing Xu, F. Ren, Xinyu Yang
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引用次数: 6

Abstract

Toughing melamine-formaldehyde (MF) rigid closed-cell foams were prepared by using ethylene glycol (EG) and carbon fiber (CF) as composite toughening agents. The pulverization rate, compressive strength, bending strength, cellular structure, closed-cell ratio, water absorption ratio, thermal conductivity, thermal stability, limiting oxygen index (LOI), and char yield were characterized to study the morphology, mechanical, thermal, and fire-retardant properties of as-prepared toughing MF rigid foams. The pulverization rate result showed that introduction of composite modifier can obviously improve the toughness of MF rigid foams. The cellular structure, closed-cell ratio, and water absorption results showed that the addition of EG/CF can increase the closed-cell ratio and control the cell size of MF rigid foams. The compressive strength and bending strength results showed that the incorporation of composite modifier of MF rigid foams dramatically improved the mechanical properties. The LOI, char yield, and thermal stability results showed that the toughing MF rigid foams remained more intact char skeleton with flame-retardant effect, thus reducing the fire hazards. The as-prepared toughing MF rigid foams showed the best comprehensive performance with pulverization rate of 5.21%, compressive strength of 355.3 kPa, bending strength of 0.44 MPa, closed-cell ratio of 79.1%, water absorption of 9%, thermal conductivity of 0.031 W m−1 K−1, and LOI of 39.6%. Compared with unmodified MF rigid foams, toughing rigid closed-cell MF foams possess excellent pulverization rate, compressive strength, bending strength, cellular structure, thermal insulation, and flame retardancy.
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乙二醇/碳纤维增韧三聚氰胺甲醛刚性闭孔泡沫的制备及性能
以乙二醇(EG)和碳纤维(CF)为复合增韧剂,制备了三聚氰胺-甲醛(MF)刚性闭孔泡沫塑料。通过表征制粒率、抗压强度、抗弯强度、孔结构、闭孔比、吸水率、导热系数、热稳定性、极限氧指数(LOI)和炭产率,研究了制备的增韧MF刚性泡沫的形貌、力学性能、热性能和阻燃性能。粉碎率试验结果表明,复合改性剂的加入能明显提高MF刚性泡沫的韧性。细胞结构、闭孔率和吸水率结果表明,EG/CF的加入可以提高MF刚性泡沫的闭孔率,控制孔的大小。抗压强度和弯曲强度结果表明,复合改性剂的掺入显著改善了MF刚性泡沫的力学性能。LOI、炭产率和热稳定性结果表明,增韧MF刚性泡沫保持了更完整的炭骨架,具有阻燃作用,从而降低了火灾危险。制备的增韧MF刚性泡沫粉化率为5.21%,抗压强度为355.3 kPa,抗弯强度为0.44 MPa,闭孔率为79.1%,吸水率为9%,导热系数为0.031 W m−1 K−1,LOI为39.6%,综合性能最佳。与未改性的MF刚性泡沫相比,增韧MF闭孔刚性泡沫具有优异的粉碎率、抗压强度、抗弯强度、孔状结构、保温性能和阻燃性能。
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来源期刊
Cellular Polymers
Cellular Polymers 工程技术-材料科学:生物材料
CiteScore
3.10
自引率
0.00%
发文量
9
审稿时长
3 months
期刊介绍: Cellular Polymers is concerned primarily with the science of foamed materials, the technology and state of the art for processing and fabricating, the engineering techniques and principles of the machines used to produce them economically, and their applications in varied and wide ranging uses where they are making an increasingly valuable contribution. Potential problems for the industry are also covered, including fire performance of materials, CFC-replacement technology, recycling and environmental legislation. Reviews of technical and commercial advances in the manufacturing and application technologies are also included. Cellular Polymers covers these and other related topics and also pays particular attention to the ways in which the science and technology of cellular polymers is being developed throughout the world.
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