Enhancing the Fracture Resistance and Impact Toughness of Mechanically Frothed Epoxy Foams with Hollow Elastomeric Microspheres
Enhancing the Fracture Resistance and Impact Toughness of Mechanically Frothed Epoxy Foams with Hollow Elastomeric Microspheres
复制标题
DOI：
10.1002/mame.201800363
复制
发表时间：
2018-09
影响因子：
3.9
通讯作者：
Wenzhe Song;V. Tagarielli;Koon-Yang Lee
中科院分区：
文献类型：
--
作者：
Wenzhe Song;V. Tagarielli;Koon-Yang Lee
无孔弹性体颗粒通常用于提高脆性环氧泡沫的韧性，但这也会降低其压缩强度和刚度。本文提出了一种利用空心弹性微球作为环氧泡沫增韧剂的新策略。与未填充的环氧泡沫相比（K1c= 0.33 MPa m0.5 和 acU= 0.79 kJ），在环氧泡沫中添加 0.5 wt.% 空心弹性体微球导致临界应力强度因子 (K1c) 增加 15% 至 0.38 MPa m0.5，夏比冲击强度 (acU) 增加 33% 至 1.05 kJ m−2 m−2)。然而，中空弹性微球浓度进一步增加至 1.0 wt.% 会导致微球团聚，从而将 K1candacU 分别降低至 0.35 MPa m0.5 和 0.93 kJ m−2。然而，添加的空心弹性微球不会导致环氧泡沫的准静态压缩性能降低。
Nonporous elastomeric particles are often employed to improve the toughness of brittle epoxy foams but this also decreases their compressive strength and stiffness. Herein, a novel strategy utilizing hollow elastomeric microspheres as toughening agent for epoxy foams is presented. The addition of 0.5 wt.% hollow elastomeric microspheres into epoxy foam leads to a 15% increase in critical stress intensity factor (K1c) to 0.38 MPa m0.5and 33% increase in Charpy impact strength (acU) to 1.05 kJ m−2, respectively, compared to unfilled epoxy foam (K1c= 0.33 MPa m0.5andacU= 0.79 kJ m−2). However, a further increase in the hollow elastomeric microsphere concentration to 1.0 wt.% leads to microsphere agglomeration, which reduces bothK1candacUto 0.35 MPa m0.5and 0.93 kJ m−2, respectively. Nevertheless, the added hollow elastomeric microspheres do not lead to a reduction in the quasi‐static compressive properties of the epoxy foams.