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首页> 外文期刊>Journal of Applied Polymer Science >Mechanical, morphological, and thermal properties of rigid polyurethane foams blown by distilled water
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Mechanical, morphological, and thermal properties of rigid polyurethane foams blown by distilled water

机译：蒸馏水吹制的硬质聚氨酯泡沫的机械，形态和热性能

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Rigid polyurethane foams (PUFs) were prepared from polymeric 4,4'-diphenylmethane diisocyanate (PMDI), polyether polyol, 1,4-butanediol, silicone surfactant, and distilled water. The properties of the synthesized PUF samples were investigated with differential scanning calorimetry, scanning electron microscopy, and a Universal testing machine. The density of the PUF was decreased from 173.7 to 41.7 kg /m(3) with an increase in distilled water from 0.5 to 3.0 parts per hundred polyol by weight (php), respectively, with 0 php butanediol. The cell size of the PUF sample increased from 115 to 258 gm with an increase in distilled water from 0.5 to 3.0 php, respectively, with 10 php butanediol. From the results of the thermal analysis of the PUF sample, it was found that the glass-transition temperatures of the PUF samples were increased from 49.5 to 80.8degreesC with an increase in distilled water from 0.5 to 3.0 php, respectively, with 0 php butanediol. The results of the investigation of the mechanical properties of the PUF samples showed that the mechanical strength of the PUF samples was increased with the distilled water at equal density. The surfactant effect on the properties of the PUF was studied, and it was observed that the cell size of the PUF samples decreased from 360 to 146 mum with an increase in surfactant from 0 to 0.33 php, respectively. However, the cell size did not change significantly when the surfactant exceeded 0.33 php. The increase of the mechanical strength from 0 to 0.33 php surfactant was attributed to the decrease of the cell size of the PUF samples, and the decrease of the mechanical strength with more than 0.33 php surfactant might be due to the plasticized effect of the PUF samples. (C) 2003 Wiley Periodicals, Inc. [References: 18]
机译：硬质聚氨酯泡沫（PUF）由聚合的4,4'-二苯基甲烷二异氰酸酯（PMDI），聚醚多元醇，1,4-丁二醇，有机硅表面活性剂和蒸馏水制备。用差示扫描量热法，扫描电子显微镜和通用测试机研究了合成的PUF样品的性能。 PUF的密度从173.7降低到41.7 kg / m（3），其中蒸馏水分别从每100重量份多元醇（php）0.5到3.0份增加，而0 php丁二醇增加。 PUF样品的泡孔尺寸从115克增加到258克，蒸馏水从10 php丁二醇分别增加到0.5到3.0 php。根据PUF样品的热分析结果，发现PUF样品的玻璃化转变温度从49.5升高到80.8℃，蒸馏水从0.5 php升高到3.0 php，丁二醇为0 php。 。 PUF样品力学性能的研究结果表明，PUF样品的机械强度随着蒸馏水的密度增加而增加。研究了表面活性剂对PUF性能的影响，观察到PUF样品的孔尺寸从360减小到146 um，表面活性剂从0增加到0.33 php。然而，当表面活性剂超过0.33php时，泡孔尺寸没有明显改变。机械强度从0增加到0.33 php表面活性剂归因于PUF样品的孔尺寸减小，而机械强度超过0.33 php降低机械强度可能归因于PUF样品的塑化作用。 （C）2003 Wiley Periodicals，Inc. [参考：18]

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