Carbon nanofiber reinforced syntactic foams: Degradation mechanism for long term moisture exposure and residual compressive properties
Carbon nanofiber reinforced syntactic foams: Degradation mechanism for long term moisture exposure and residual compressive properties
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DOI：
10.1016/j.polymdegradstab.2013.07.007
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发表时间：
2013-10
影响因子：
5.9
通讯作者：
R. Poveda;G. Dorogokupets;N. Gupta
中科院分区：
文献类型：
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作者：
R. Poveda;G. Dorogokupets;N. Gupta
空心颗粒填充聚合物基复合材料，称为复合泡沫塑料，是具有挑战性的研究有关的环境暴露和降解机制，由于基质，颗粒-基质界面，颗粒材料和壁厚的可能作用。在目前的研究中，复合泡沫塑料增强与1重量%使气相生长的碳纳米纤维（CNF）经受水浸并表征在准静态和高应变率下的残余压缩性能。对四种不同类型的复合泡沫塑料进行测试，所述复合泡沫塑料由两种不同密度的玻璃中空颗粒制成：220和460 kg/m3，体积百分比为30和50是介于6个月后，在性能最差的复合泡沫中观察到最大7%的重量增加。对暴露后的试件进行了残余压缩性能测试，并与干燥试件的性能进行了比较。准静态压缩强度的CNF增强复合泡沫塑料被发现降低和模量保持不受影响，由于水分暴露。高应变率压缩强度是1.3-2.2倍高的湿和干试样相比，准静态强度相同类型的复合泡沫塑料。
Hollow particle filled polymer matrix composites, called syntactic foams, are challenging for studies related to environmental exposure and degradation mechanisms due to the possible role of matrix, particle–matrix interface, and particle material and wall thickness. In the current study, syntactic foams reinforced with 1 wt.% vapor grown carbon nanofibers (CNFs) are subjected to water immersion and characterized for residual compressive properties under quasi-static and high strain rates. The testing is conducted on four different types of syntactic foams, fabricated with glass hollow particles of two different densities: 220 and 460 kg/m3in 30 and 50 vol.% quantities. After a period of 6 months, a maximum of 7% weight gain is observed in the worst performing syntactic foam. The exposed specimens are tested for residual compressive properties and the results are compared with the properties of dry specimens. The quasi-static compressive strength of CNF reinforced syntactic foams is found to decrease and the modulus remained unaffected due to the moisture exposure. The high strain rate compressive strength was 1.3–2.2 times higher for wet and dry specimens compared to the quasi-static strength of the same type of syntactic foams.