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首页> 外文期刊>Journal of Applied Polymer Science >Properties of Rigid Polyrethane Foams Blown by HCFC 141B and Distilled Water
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Properties of Rigid Polyrethane Foams Blown by HCFC 141B and Distilled Water

机译：HCFC 141B和蒸馏水吹制的硬质聚氨酯泡沫的性能

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摘要

Rigid polyurethane forms (PUFs) were prepared from polymeric 4,4'-diphenylmethane diisocyanate,polyester polyol,1,4-butane diol,silicone surfactant,hydrochlorofluorocarbon (HCFC) 141b,and distilled water.The properties and structure of the PRFs were investigated with differential scanning calorimetry (DSC),scanning electron microscopy (SEM),and a universal testing machine.The density of the PUF blown by distilled water and/of HCFC 141B decreased from 175.7 to 28.2 kg/m~3 with an increase of blowing agents.From the SEM results,the average cell size of the PUF blown by distilled water increased from 150 to 290 #mu#m with the distilled water content.From the DSC results,the glass-transition temperature (T_g) of the PUF blown by distilled water increased from 85.7 to 101.7 deg C with increasing distilled water content,whereas the T_g of the PUF blown HCFC 141B remained unchanged with HCFC 141B content.The compressive strength and modulus of the PUF blown by a mixture of distilled water and HCFC 141B was increased from 0.13 to 0.25 MPa and from 3.00 to 7.23 MPa,respectively,with the distilled water content at the sample density of about 44.0 kg/m~3.The increase of the compressive strength and modulus of the PUF at the same density was related to the increase of the T_g from 86.0 to 100.9 deg C.
机译：由聚合的4,4'-二苯基甲烷二异氰酸酯，聚酯多元醇，1,4-丁二醇，硅氧烷表面活性剂，氢氯氟烃（HCFC）141b和蒸馏水制得硬质聚氨酯形式（PUF）。研究了PRF的性质和结构。使用差示扫描量热法（DSC），扫描电子显微镜（SEM）和通用测试仪。蒸馏水和/或HCFC 141B吹制的PUF的密度从175.7降至28.2 kg / m〜3从SEM结果来看，蒸馏水吹制的PUF的平均泡孔尺寸从150＃mu＃m增加到290＃mu＃m（蒸馏水含量高）.DSC结果显示，吹制的PUF的玻璃化转变温度（T_g）随着蒸馏水含量的增加，蒸馏水从85.7摄氏度增加到101.7摄氏度，而PUF吹制的HCFC 141B的T_g与HCFC 141B含量保持不变。 HCFC 141B在样品密度约为44.0 kg / m〜3时分别从0.13 MPa升高至0.25 MPa和从3.00 MPa升高至7.23 MPa。密度与T_g从86.0摄氏度增加到100.9摄氏度有关。

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