Layered Thin Film Deposition via Extreme Inter-Brush Slip in a Lamellar Block Copolymer
Layered Thin Film Deposition via Extreme Inter-Brush Slip in a Lamellar Block Copolymer
复制标题
通过层状嵌段共聚物中的极端刷间滑移进行分层薄膜沉积
DOI:
10.1021/acs.macromol.2c01496
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发表时间:
2022
期刊:
影响因子:
5.5
通讯作者:
Thomas, Edwin L.
中科院分区:
文献类型:
--
作者:
Shan, Wenpeng;Weisbord, Inbal;Feng, Xueyan;Hyon, Jinho;Manesi, Gkreti-Maria;Avgeropoulos, Apostolos;Segal-Peretz, Tamar;Thomas, Edwin L.
Creating ultrathin films via ballistic impact-induced frictional material transfer could be a new approach for additive manufacturing compared with current solvent-assisted polymer coatings. The covalently bonded A block brushes and B block brushes are robust mechanical units in A/B lamellar diblock copolymers (BCPs). The parallel brush–brush interfaces with low entanglement density present a unique set of slip planes that can undergo extreme deformation by shearing and delamination by tensile forces. Impact of microspheres comprised of concentric glassy–rubbery brush layers against a rigid substrate at ballistic strain rates causes adiabatic shock heating that permits compressional thinning of the bottommost layers via slip over both types of BCP brushes. In cooler regions, the mechanical contrast between the glassy A blocks and rubbery B blocks induces extensive slip across the rubbery block brushes. For angled impacts, the increased shear stress enhances brush slip and the particle slides across the substrate accompanied by delamination across the slip planes and unique frictional transfer of discrete B-block-A A-block B layers.
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