Bio-based polyurethane prepared from Kraft lignin and modified castor oil
Bio-based polyurethane prepared from Kraft lignin and modified castor oil
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DOI：
10.3144/expresspolymlett.2016.86
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发表时间：
2016-11-01
影响因子：
3.3
通讯作者：
Santos, D. J.
中科院分区：
文献类型：
--
作者：
Tavares, L. B.;Boas, C. V.;Santos, D. J.
当前的挑战突出了使用可再生天然资源作为石油基聚合物替代品的聚合物研究的需求。使用从可再生来源获得的多元醇与再利用工业残留物如木质素相结合是该工艺中的重要因素。通过将工业硫酸盐木质素（TKL）与蓖麻油（CO）或改性蓖麻油（MCO 1和MCO 2）组合以增加它们对二苯基甲烷二异氰酸酯（MDI）的反应性来制备不同组合物的聚碳酸酯型材料。结果表明，木质素的加入提高了材料的玻璃化转变温度和交联密度，并使材料的极限应力从8.2MPa（不含木质素）提高到23.5MPa。单轴拉伸试验后断裂表面的扫描电子显微镜（SEM）显微照片显示韧脆转变。结果表明，开发聚氨酯型材料的可能性，不同的工业级硫酸盐木质素含量，其中涵盖了广泛的机械性能（从大弹性/低杨氏模量到脆性/高杨氏模量聚氨酯）。
Current challenges highlight the need for polymer research using renewable natural sources as a substitute for petroleum-based polymers. The use of polyols obtained from renewable sources combined with the reuse of industrial residues such as lignin is an important agent in this process. Different compositions of polyurethane-type materials were prepared by combining technical Kraft lignin (TKL) with castor oil (CO) or modified castor oil (MCO1 and MCO2) to increase their reactivity towards diphenylmethane diisocyanate (MDI). The results indicate that lignin increases the glass transition temperature, the crosslinking density and improves the ultimate stress especially for those prepared from MCO2 and 30% lignin content from 8.2 MPa (lignin free) to 23.5 MPa. Scanning electron microscopy (SEM) micrographs of rupture surface after uniaxial tensile tests show ductile-to-brittle transition. The results show the possibility to develop polyurethane-type materials, varying technical grade Kraft lignin content, which cover a wide range of mechanical properties (from large elastic/low Young modulus to brittle/high Young modulus polyurethanes).