Polystyrene and poly(methyl methacrylate) interfaces reinforced with diblock carbon nanotubes,Polymer Engineering and Science

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Polystyrene and poly(methyl methacrylate) interfaces reinforced with diblock carbon nanotubes
Polymer Engineering and Science ( IF 3.2 ) Pub Date : 2021-02-11 , DOI: 10.1002/pen.25665
Fatoumata Ide Seyni ₁ , Lawrence Barrett ₁ , Steven Crossley ₁ , Brian P. Grady ₁

Affiliation

An asymmetric double cantilever beam test was used to determine the ability of carbon nanotubes with varying chemistry along their lengths, that is, diblock nanotubes, to compatibilize the polystyrene/poly(methyl methacrylate) (PS/PMMA) interface. PS molecules were grafted primarily to one of the blocks to cause that block to migrate to the PS phase since otherwise both blocks would prefer to reside in PMMA. Fracture toughnesses increased monotonically with increasing diblock carbon nanotube concentration and maximum values were like those for block copolymer‐reinforced interfaces while single‐chemistry nanotubes showed no reinforcing effect. However, the abrupt increase in fracture toughness with added compatibilizer indicative of a transition to crazing was not found consistent with nanotubes suppressing crazing in homopolymers. Scanning electron microscopy images of the fractured surfaces show agglomerates of carbon nanotubes present which are likely limiting the efficacy of carbon nanotubes at toughening the interface.

中文翻译：

双嵌段碳纳米管增强的聚苯乙烯和聚甲基丙烯酸甲酯界面

使用不对称双悬臂梁测试来确定沿其长度变化的化学性质的碳纳米管（即双嵌段纳米管）使聚苯乙烯/聚（甲基丙烯酸甲酯）（PS / PMMA）界面相容的能力。PS分子主要接枝到一个嵌段上，以使该嵌段迁移到PS相，因为否则两个嵌段都希望保留在PMMA中。断裂韧性随二嵌段碳纳米管浓度的增加而单调增加，最大值类似于嵌段共聚物增强的界面，而单化学纳米管则没有增强作用。然而，未发现通过添加相容剂指示裂纹过渡的断裂韧性的突然增加与抑制均聚物中的裂纹的纳米管一致。

更新日期：2021-04-09

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