Scholarlink

<p>Self-assembly of block copolymers (BCPs) into well-defined nanostructures has emerged as a powerful strategy for tailoring material properties across diverse applications. Crystallization-driven self-assembly (CDSA) has been particularly effective in constructing hierarchical nanostructures with precise control over size, morphology, and functionality. Polyhedral oligomeric silsesquioxane (POSS) cages, known for their unique chemical and physical properties, have recently been used to create hybrid POSS-containing polymers, which show different crystallization mechanisms from the folded-chain model of conventional polymers. In this study, we designed and synthesized two hybrid block copolymers by covalently attaching a crystalline POSS-containing polymer segment (exact four repeating units, <b>BP</b><sub><b>4</b></sub>) to poly(ethylene oxide) (PEO) or poly(methyl methacrylate) (PMMA), affording <b>BP</b><sub><b>4</b></sub>-<b>PEO</b> and <b>BP</b><sub><b>4</b></sub>-<b>PMMA</b>, respectively. We systematically investigated the CDSA behavior of these hybrid block copolymers under various conditions using the self-seeding and direct cooling methods. Our findings demonstrate the potential for selective CDSA of either the <b>BP</b><sub><b>4</b></sub> segment or the PEO block in <b>BP</b><sub><b>4</b></sub>-<b>PEO</b>, leading to a similar nanosheet morphology and distinct core crystal structures. Monocrystalline <b>BP</b><sub><b>4</b></sub>-<b>PMMA</b> exclusively forms <b>BP</b><sub><b>4</b></sub>-crystallized nanosheets owing to the amorphous nature of PMMA under the given conditions. The dimensions of self-assembled 2D nanostructures can be tuned by varying the cooling rate and initial concentration. This work provides insights into programmable crystallization pathways in hybrid block copolymers and highlights the potential for designing advanced functional nanomaterials with tailored morphologies and properties.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Core Structure Modulation of 2D Nanosheets by Selective Crystallization-driven Self-assembly of Polyhedral Oligomeric Silsesquioxane-containing Block Copolymers

  • 期刊论文

  • 发表日期：

    2026年4月7日

查看全文
  • Cheng-Yang Hong,
  • Kun Yu,
  • Heng-Zhi You,
  • Wei Tian,
  • Qing-Yun Guo,
  • Hao Liu

摘要

Self-assembly of block copolymers (BCPs) into well-defined nanostructures has emerged as a powerful strategy for tailoring material properties across diverse applications. Crystallization-driven self-assembly (CDSA) has been particularly effective in constructing hierarchical nanostructures with precise control over size, morphology, and functionality. Polyhedral oligomeric silsesquioxane (POSS) cages, known for their unique chemical and physical properties, have recently been used to create hybrid POSS-containing polymers, which show different crystallization mechanisms from the folded-chain model of conventional polymers. In this study, we designed and synthesized two hybrid block copolymers by covalently attaching a crystalline POSS-containing polymer segment (exact four repeating units, BP4) to poly(ethylene oxide) (PEO) or poly(methyl methacrylate) (PMMA), affording BP4-PEO and BP4-PMMA, respectively. We systematically investigated the CDSA behavior of these hybrid block copolymers under various conditions using the self-seeding and direct cooling methods. Our findings demonstrate the potential for selective CDSA of either the BP4 segment or the PEO block in BP4-PEO, leading to a similar nanosheet morphology and distinct core crystal structures. Monocrystalline BP4-PMMA exclusively forms BP4-crystallized nanosheets owing to the amorphous nature of PMMA under the given conditions. The dimensions of self-assembled 2D nanostructures can be tuned by varying the cooling rate and initial concentration. This work provides insights into programmable crystallization pathways in hybrid block copolymers and highlights the potential for designing advanced functional nanomaterials with tailored morphologies and properties.