Storage Weathering Resistance of Zeolitic Acoustically Enhanced Materials
In this work,the effects of different humidity and organic compounds on resonance frequency offsets(RFOs)of acoustically enhanced materials(AEM)were studied.Undergoing 25℃/50％relative humidity(RH)or 25℃/95％RH storage,coexisting with organic compounds,the changes of RFOs of AEM,composed of zeolite with various silicon-aluminum ratios(SAR),were comprehensively discussed.The results showed that for the AEM composed of zeolite with a specialized silicon-aluminum ratio,the RFOs did not change significantly,after 25℃/50％RH and 25℃/95％RH storage.The results of the nitrogen adsorption experiment at 25℃/50％RH and 25℃/95％RH showed that nitrogen molecules occupied only a small part of the specific surface area at 25℃,and the presence of water molecules did not affect the adsorption of nitrogen molecules.The water molecules adsorbed at 25℃/95％RH will gradually desorb after standing at 25℃/50％RH.After coexisting with different types of organic compounds,the RFOs of AEM had different trends.For organic compounds with small size,with partially reversible adsorption,the RFOs of AEM did not change significantly;for organic compounds with larger size or terminal groups of smaller size,because of inserted adsorption,the RFOs of AEM were significantly reduced.
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