化工学报 ›› 2023, Vol. 74 ›› Issue (7): 3079-3092.DOI: 10.11949/0438-1157.20230381
收稿日期:
2023-04-18
修回日期:
2023-06-23
出版日期:
2023-07-05
发布日期:
2023-08-31
通讯作者:
罗英武
作者简介:
张澳(1999—),男,硕士研究生,aozhang@zju.edu.cn
基金资助:
Received:
2023-04-18
Revised:
2023-06-23
Online:
2023-07-05
Published:
2023-08-31
Contact:
Yingwu LUO
摘要:
丙烯酸酯压敏胶广泛应用在电子器件的装配中。随着可折叠屏手机等柔性电子器件发展,传统压敏胶因无法平衡低模量、高弹性以及高剥离强度而难以满足柔性电子器件对反复动态变形的需求。以苯乙烯、丙烯酸异辛酯为单体,采用RAFT乳液聚合设计制备了聚苯乙烯-b-聚丙烯酸异辛酯-b-聚苯乙烯(SEHAS)和聚苯乙烯-b-聚丙烯酸异辛酯(SEHA)嵌段聚合物,研究两种嵌段共聚物共混体系的力学性能、黏弹性和黏结性能。发现当共混物中SEHA的含量从0(质量)提高到75%(质量)时,玻璃化温度仍为-68℃,保持不变,剪切储能模量从27 kPa下降至15 kPa,剥离强度从8.1 N/25 mm提升到10.3 N/25 mm,应变回复率仍然保持在95%以上。研究表明SEHAS/SEHA共组装是一种简便降低模量同时维持较好的交联网络完整性并提高黏弹性的新方法,能够更好地平衡压敏胶高柔性、大变形后的回弹性和良好界面黏合性之间的关系。
中图分类号:
张澳, 罗英武. 低模量、高弹性、高剥离强度丙烯酸酯压敏胶[J]. 化工学报, 2023, 74(7): 3079-3092.
Ao ZHANG, Yingwu LUO. Low modulus, high elasticity and high peel adhesion acrylate pressure sensitive adhesives[J]. CIESC Journal, 2023, 74(7): 3079-3092.
Type | Stage | Mn,design① | Mn,exp | PDI | |
---|---|---|---|---|---|
SEHAS | 1 | 96.9 | 15 | 17.4 | 1.27 |
2 | 97.1 | 195 | 201.6 | 2.08 | |
3 | 95.5 | 210 | 217.1 | 2.10 | |
SEHA | 1 | 96.8 | 5 | 6.3 | 1.64 |
2 | 97.6 | 125 | 124.0 | 2.74 |
表1 嵌段共聚物的链结构
Table 1 Molecular structure of the block copolymers
Type | Stage | Mn,design① | Mn,exp | PDI | |
---|---|---|---|---|---|
SEHAS | 1 | 96.9 | 15 | 17.4 | 1.27 |
2 | 97.1 | 195 | 201.6 | 2.08 | |
3 | 95.5 | 210 | 217.1 | 2.10 | |
SEHA | 1 | 96.8 | 5 | 6.3 | 1.64 |
2 | 97.6 | 125 | 124.0 | 2.74 |
图15 200%、300%和400%拉伸应变下不同比例SEHAS/SEHA共混物的应力和应变随时间的变化
Fig.15 Stress and strain related with time of SEHAS/SEHA with different blending ratios under a strain of 200%, 300% and 400%
图16 200%、300%和400%拉伸应变下不同比例SEHAS/SEHA共混物的应力松弛率和应变回复率
Fig.16 Stress relaxation ratio and strain recovery ratio of SEHAS/SEHA with different blending ratios under a strain of 200%, 300% and 400%
图17 400%拉伸应变下不同比例SEHAS/SEHA共混物的应力松弛拟合
Fig.17 Experimental (dot) and fitting results (solid line) with KWW equation of stress relaxation behavior of SEHAS/SEHA with different blending ratios under a strain 400%
SEHAS/SEHA比例 | ||||
---|---|---|---|---|
100∶0 | 0.033 | 0.095 | 3.21 | 0.35 |
75∶25 | 0.034 | 0.082 | 2.20 | 0.32 |
50∶50 | 0.045 | 0.061 | 2.45 | 0.34 |
25∶75 | 0.022 | 0.036 | 0.84 | 0.34 |
表2 400%拉伸应变下不同比例SEHAS/SEHA共混物的拟合参数
Table 2 Fitting parameters of SEHAS/SEHA with different blending ratios under a strain of 400%
SEHAS/SEHA比例 | ||||
---|---|---|---|---|
100∶0 | 0.033 | 0.095 | 3.21 | 0.35 |
75∶25 | 0.034 | 0.082 | 2.20 | 0.32 |
50∶50 | 0.045 | 0.061 | 2.45 | 0.34 |
25∶75 | 0.022 | 0.036 | 0.84 | 0.34 |
品牌/参数 | 膜厚/μm | 断裂 伸长率/% | 玻璃化 温度/°C | 剪切储能模量 (1 rad/s)/kPa | 损耗因子 (1 rad/s) | 应力 松弛率/% | 应变 回复率/% | 剥离强度/ (N/25 mm) |
---|---|---|---|---|---|---|---|---|
SEHAS∶SEHA=100∶0 | 25 | 1000 | -68 | 27 | 0.21 | 约20 | >95 | 8.1 |
SEHAS∶SEHA=25∶75 | 25 | 700 | -68 | 15 | 0.30 | 约40 | >95 | 10.3 |
3M CEF3501 | 25 | 598 | -42 | 30 | 0.33 | — | — | 8.5 |
AA改性[ | 100 | 约410 | -54 | 27 | — | 约48 | >95 | 约13.8① |
丙烯酸酯弹性体改性[ | 75 | — | -40 | — | — | 约50 | 约75 | 约12.0① |
交联密度调控[ | 50 | — | -31 | — | — | 约71 | 约71 | 约10.0① |
表3 本文设计制备的压敏胶与文献报道的可折叠压敏胶综合性能对比
Table 3 The property and performance comparison of the foldable pressure sensitive adhesive between the current work and the literature
品牌/参数 | 膜厚/μm | 断裂 伸长率/% | 玻璃化 温度/°C | 剪切储能模量 (1 rad/s)/kPa | 损耗因子 (1 rad/s) | 应力 松弛率/% | 应变 回复率/% | 剥离强度/ (N/25 mm) |
---|---|---|---|---|---|---|---|---|
SEHAS∶SEHA=100∶0 | 25 | 1000 | -68 | 27 | 0.21 | 约20 | >95 | 8.1 |
SEHAS∶SEHA=25∶75 | 25 | 700 | -68 | 15 | 0.30 | 约40 | >95 | 10.3 |
3M CEF3501 | 25 | 598 | -42 | 30 | 0.33 | — | — | 8.5 |
AA改性[ | 100 | 约410 | -54 | 27 | — | 约48 | >95 | 约13.8① |
丙烯酸酯弹性体改性[ | 75 | — | -40 | — | — | 约50 | 约75 | 约12.0① |
交联密度调控[ | 50 | — | -31 | — | — | 约71 | 约71 | 约10.0① |
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