Effect of Crosslink Density on Thermal Aging of Bio-Based Rigid Low-Density Closed-Cell Polyurethane Foams

被引：2
|
作者：
Kirpluks, M. [1 ]
Godina, D. [1 ]
Svajdlenkova, H. [2 ,3 ]
Sausa, O. [3 ,4 ]
Modniks, J. [1 ,5 ]
Simakovs, K. [1 ]
Andersons, J. [1 ,5 ]
机构：
[1] Latvian State Inst Wood Chem, Polymer Lab, LV-1006 Riga, Latvia
[2] Slovak Acad Sci, Polymer Inst, Bratislava 84541, Slovakia
[3] Comenius Univ, Dept Nucl Chem, Bratislava 84215, Slovakia
[4] Inst Phys, Slovak Acad Sci, Bratislava 84511, Slovakia
[5] Univ Latvia, Inst Mech Mat, LV-1004 Riga, Latvia
来源：
ACS APPLIED POLYMER MATERIALS | 2023年 / 5卷 / 06期
关键词：
polyurethane; rigid low-density foams; thermalaging; gas diffusivity; free volume; ANNIHILATION LIFETIME SPECTROSCOPY; MECHANICAL-PROPERTIES; INSULATION MATERIALS; BLOWING AGENTS; HEAT-TRANSFER; FREE-VOLUME; CONDUCTIVITY; PERMEABILITY; TEMPERATURE; MIXTURES;
D O I：
10.1021/acsapm.3c00470
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Gradual replacement of the traditional raw materialsin polyurethane(PU) synthesis by bio-based ones and introduction of environmentallyfriendly physical blowing agents (PBAs) motivate the analysis of thermalaging of bio-based foams in order to optimize the chemical structureof the PU matrix so that its permeability to PBA is minimized. Withthe aim of elucidating the effect of the PU chemical structure onthermal aging of foams, rigid low-density closed-cell PU foams wereproduced solely from bio-based polyols. The effective diffusivitiesof PBA and atmospheric gasses were evaluated based on the measuredthermal conductivity aging of foams and validated by gas chromatographymeasurements of gas composition in foam cells. Gas permeability ofthe PU polymer was estimated based on effective diffusivity in foamsand foam morphology and found to decrease with increasing crosslinkdensity, apparently due to reduction in the fractional free volumein the polymers.
引用
收藏
页码：4305 / 4315
页数：11
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