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首页> 外文期刊>Journal of Applied Polymer Science >Biodegradable polyurethane materials from bark and starch. I. Highly resilient foams
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Biodegradable polyurethane materials from bark and starch. I. Highly resilient foams

机译：由树皮和淀粉制成的可生物降解的聚氨酯材料。 I.高弹性泡沫

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Liquefaction of the bark of Acacia mearnsii (BK) and cornstarch (CS) was conducted by using a solvent mixture consisting of poly(propylene glycol) (PPG), glycerol, and sulfuric acid with a weight fraction of 94/5/1 at 150 degrees C. Solubilities of BK and CS were about 80% after 60 min and 100% after 20 min in the same solvent, respectively. Highly elastic or highly resilient (HR) polyurethane foams (PUFs) suitable for car-seat cushions were prepared from the liquefied BK and CS without removing the insoluble residue from the liquefaction mixture. About 20% of the insoluble residue from BK contributed remarkably to the improvement of flame resistance of the resulting PUFs. HR PUFs having better resilience properties were prepared using PPC of molecular weight around 4000, as compared with poly(ethylene glycol) having the same hydroxyl value. PUFs were synthesized from three BKs with different tannin contents, that is, BK0 (tannin: 0%), BK1 (tannin: 43%), and BK2 (tannin: 48.5%), to evaluate the effect of the tannin content on their performance of resilience. Both the resilience value and density of the PUFs increased with increasing BK content for all BK systems. BK2 was chosen to prepare PUFs in the further work. When CS replaced part of BK, the density and compressive strength of the PUFs decreased with an increasing cornstarch proportion, whereas the resilience value had its maximum value when the weight ratio of CS:BK was 1:1. The PUFs were, to some extent, biodegradable: The average weight loss of samples buried in soil for 6 months was 15.6 wt %. (C) 2000 John Wiley & Sons, Inc. [References: 11]
机译：通过使用由聚丙二醇（PPG），甘油和硫酸组成的溶剂混合物以150的重量比为94/5/1进行液化阿拉伯树胶（BK）和玉米淀粉（CS）的树皮在相同溶剂中，BK和CS的溶解度分别在60分钟后约80％和20分钟后约100％。由液化的BK和CS制备了适用于汽车座垫的高弹性或高弹性（HR）聚氨酯泡沫（PUF），而没有从液化混合物中除去不溶性残留物。来自BK的约20％的不溶残留物显着有助于改善所得PUF的阻燃性。与具有相同羟基值的聚乙二醇相比，使用分子量约为4000的PPC制备了具有更好回弹性的HR PUF。由三种单宁含量不同的BK合成PUF，即BK0（单宁：0％），BK1（单宁：43％）和BK2（单宁：48.5％），以评估单宁含量对其性能的影响弹性。对于所有BK系统，PUF的弹性值和密度都随BK含量的增加而增加。选择BK2来准备PUF，以进行进一步的工作。当CS替代部分BK时，PUF的密度和抗压强度随玉米淀粉比例的增加而降低，而CS：BK的重量比为1：1时，回弹力值达到最大值。 PUF在某种程度上是可生物降解的：埋在土壤中6个月的样品的平均重量损失为15.6 wt％。 （C）2000 John Wiley＆Sons，Inc. [参考：11]

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