A convenient and efficient path to bead foam parts: Restricted cell growth and simultaneous inter-bead welding

Extruded polylactide bead foams using anhydrous supercritical CO2 extrusion foaming

“…In particular, bead foams have the special advantage of being able to form lowdensity 3D complex components through steam-chest molding. [9][10][11] Nowadays, bead foams can be produced with two different techniques: autoclave foaming and extrusion foaming. Compared with autoclave foaming, extrusion foaming is more cost-efficient, time-saving, and has no wastewater generation.…”

“…Currently, various strategies including microcellular injection foaming, 6 autoclave foaming, 7 and extrusion foaming 8 have been developed to prepare polymer foams. In particular, bead foams have the special advantage of being able to form low‐density 3D complex components through steam‐chest molding 9–11 . Nowadays, bead foams can be produced with two different techniques: autoclave foaming and extrusion foaming.…”

聚合物发泡与多孔功能材料的研究与应用进展

“…随空气扩散进入泡孔内部, 发泡样 品能够发生不同程度的体积恢复(图3(c, d)). Jiang等 人 [18] 发现, 在一定的发泡条件下, 初始膨胀倍率为16.8 倍的85A TPU发泡样品在收缩阶段的收缩率为76.5%, 相应的膨胀倍率降低至4.0倍. 随着空气不断扩散到泡 孔内部, 收缩样品的体积增加了86.2%, 其膨胀倍率恢 复到7.4倍, 发泡样品的综合收缩率则为40%.…”

“…随着空气不断扩散到泡 孔内部, 收缩样品的体积增加了86.2%, 其膨胀倍率恢 复到7.4倍, 发泡样品的综合收缩率则为40%. 发泡样品 的收缩过程还与样品形态、热塑弹性体种类、初始膨 胀程度等因素密切相关 [18,75] , 通过混合气体 [65,76] 、微交 联 [77,78] 、共混 [62] 、添加无机填料 [79,80] 、调控气体置换 过程 [81] 等途径可以改善热塑弹性体的发泡后收缩. Xu 等人 [76] 发现在所得TPEE泡沫最终膨胀倍率为9.0倍的…”

“…(b) 发泡时分子链的运动 [48] . (c) TPU发泡样品的膨胀 倍率随储存时间的变化 [18] , Copyright©2023, Elsevier. (d) TPU发泡珠粒处于初始状态和稳定状态时的数码照片对比 [18] , Copyright©2023, Elsevier Figure 3 Shrinkage behavior of thermoplastic elastomer foams.…”