Organic Materials Diagnosis Group, National Institute of Advanced Industrial Science and Technology, 3-11-32 Kagamiyama, Higashihiroshima, Hiroshima 739-0046, Japan.
Institute of Materials Structure Science, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba, Ibaraki 305-0801, Japan.
ACS Macro Lett. 2022 Apr 19;11(4):504-509. doi: 10.1021/acsmacrolett.2c00062. Epub 2022 Mar 23.
The interfacial strength of polystyrene (PS) with and without PS oligomers in contact with a glass substrate was examined to determine the relationship between the interfacial aggregation state and adhesion. The shear bond strength and adsorbed layer thickness of neat PS exhibited a similar dependence on the thermal annealing time: they increased to constant values within almost the same time. This implies that the adhesion of the polymer is closely related to the formation of an adsorbed layer at the adhesion interface. Nevertheless, in the case of PS with a small amount of oligomer, the shear bond strength decreased, while the adsorbed layer thickness was almost the same as that of neat PS. Based on the results of interfacial analyses, we propose that the interfacial segregation of the oligomer reduced the entanglement between the interfacial free chains in the adsorbed layer and the bulk chains.
研究了与玻璃基底接触的聚苯乙烯（PS）及其带有 PS 低聚物的界面强度，以确定界面聚集状态与粘附力之间的关系。纯 PS 的剪切结合强度和吸附层厚度随热退火时间的变化表现出相似的依赖性：它们在几乎相同的时间内增加到恒定值。这意味着聚合物的粘附力与粘附界面处吸附层的形成密切相关。然而，在少量低聚物的情况下，剪切结合强度降低，而吸附层厚度几乎与纯 PS 相同。基于界面分析的结果，我们提出低聚物的界面分离减少了吸附层中界面自由链与本体链之间的缠结。
