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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and properties of biocomposites composed of glycerol-based epoxy resins, tannic acid, and wood flour
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Preparation and properties of biocomposites composed of glycerol-based epoxy resins, tannic acid, and wood flour

机译：由甘油基环氧树脂，鞣酸和木粉组成的生物复合材料的制备和性能

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摘要

After polyglycerol polyglycidyl ether (PGPE) and glycerol polyglycidyl ether (GPE) were mixed with tannic acid (TA) in ethanol and without solvent at epoxy/hydroxyl ratio 1/1, the obtained GPE-TA and PGPE-TA solutions were mixed with wood flour (WF), prepolymerized at 50° C, and subsequently compressed at 160°C for 3 h to give GPE-TA/WF and PGPE-TA/WF bio-composites with WF content 50-70 wt %, respectively. The storage moduli of the biocomposites in the rubbery state at more than 80°C were much higher than that of the control cured resins. The PGPE-TA/WF composites had higher tensile modulus and rather lower tensile strength than PGPE-TA. On the other hand, both the tensile modulus and strength of GPE-TA/WF were much higher than those of GPE-TA (2.4 GPa and 37 MPa). Those values of GPE-TA/WF increased with WF content, became maximal values (5.1 GPa and 51 MPa) at WF content 60 wt %, and were lowered at 70 wt %. FE-SEM analysis of the fractured surface of the biocomposites revealed that WF is tightly incorporated into the crosslinked epoxy resins. As a result of optimization of the epoxy/hydroxyl molar ratio for GPE-TA/WF composite with WF content 60 wt %, the composite prepared at the ratio of 1.0/0.8 showed the highest tensile modulus and strength.
机译：将聚甘油聚缩水甘油醚（PGPE）和甘油聚缩水甘油醚（GPE）与单宁酸（TA）在乙醇中，无溶剂的情况下以环氧/羟基比1/1混合后，将得到的GPE-TA和PGPE-TA溶液与木材混合面粉（WF），在50°C下预聚合，然后在160°C下压制3小时，分别得到WF含量为50-70 wt％的GPE-TA / WF和PGPE-TA / WF生物复合材料。在高于80℃的橡胶态下，生物复合材料的储能模量比对照固化树脂的储能模量高得多。 PGPE-TA / WF复合材料比PGPE-TA具有更高的拉伸模量和更低的拉伸强度。另一方面，GPE-TA / WF的拉伸模量和强度均远高于GPE-TA（2.4 GPa和37 MPa）。 GPE-TA / WF的那些值随WF含量增加而增加，在WF含量为60wt％时变为最大值（5.1GPa和51MPa），而在70wt％时降低。对生物复合材料断裂表面的FE-SEM分析表明，WF被紧密地结合到交联的环氧树脂中。通过优化WF含量为60wt％的GPE-TA / WF复合材料的环氧/羟基摩尔比，以1.0 / 0.8的比例制备的复合材料表现出最高的拉伸模量和强度。

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