The present work reports on the synthesis of foams from epoxidized pine oil (EPO) with polymethylhydrosiloxane (PMHS) used as a foaming agent. The effect of two different processing methods involving modifications of curing agent and foaming agent addition timings was also analyzed. Resultant foams were characterized via density, mechanical and thermal testing, and microstructure. Foams produced using a modified processing method displayed properties that deviate from the Ashby–Gibson models, resulting in superior compressive strengths over many synthetic and biobased epoxy foams, ranging from 6.1 to 11.3 MPa. The impact of the method on cellular microstructure was also significant, with 20- and 30-fold increase in cell density from the original processing method for the same levels of foaming agent in both the methods. Glass transition temperatures of the foams ranged from 61.8 to 97 °C, higher than those of many foams in their class.

中文翻译：

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加工的力量：用环氧松油制造高强度泡沫

本工作报道了使用聚甲基氢硅氧烷（PMHS）作为发泡剂由环氧化松油（EPO）合成泡沫。还分析了涉及改变固化剂和发泡剂添加时间的两种不同加工方法的效果。通过密度，机械和热测试以及微观结构对生成的泡沫进行了表征。使用改进的加工方法生产的泡沫显示出与Ashby–Gibson模型不同的特性，从而产生了优于许多合成和生物基环氧泡沫的压缩强度，范围从6.1到11.3 MPa。该方法对泡孔微观结构的影响也很显着，两种方法中发泡剂含量相同时，泡孔密度比原始处理方法分别提高了20倍和30倍。