The processing capability is vital for the wide applications of materials to forge structures as-demand.Graphene-based macroscopic materials have shown excellent mechanical and functional properties.However,different ...The processing capability is vital for the wide applications of materials to forge structures as-demand.Graphene-based macroscopic materials have shown excellent mechanical and functional properties.However,different from usual polymers and metals,graphene solids exhibit limited deformability and processibility for precise forming.Here,we present a precise thermoplastic forming of graphene materials by polymer intercalation from graphene oxide(GO)precursor.The intercalated polymer enables the thermoplasticity of GO solids by thermally activated motion of polymer chains.We detect a critical minimum containing of intercalated polymer that can expand the interlayer spacing exceeding 1.4 nm to activate thermoplasticity,which becomes the criteria for thermal plastic forming of GO solids.By thermoplastic forming,the flat GO-composite films are forged to Gaussian curved shapes and imprinted to have surface relief patterns with size precision down to 360 nm.The plastic-formed structures maintain the structural integration with outstanding electrical(3.07×10^(5) S m^(−1))and thermal conductivity(745.65 W m^(−1) K^(−1))after removal of polymers.The thermoplastic strategy greatly extends the forming capability of GO materials and other layered materials and promises versatile structural designs for more broad applications.展开更多
“高分子材料成型工艺与设备”是高分子材料与工程专业的专业必修核心课程,该课程存在内容多、理论内容抽象难以理解、知识点分散、教学方式单一等问题。为提升教学质量,基于以成果为导向的OBE(Outcome Based Education)教学理念,从学...“高分子材料成型工艺与设备”是高分子材料与工程专业的专业必修核心课程,该课程存在内容多、理论内容抽象难以理解、知识点分散、教学方式单一等问题。为提升教学质量,基于以成果为导向的OBE(Outcome Based Education)教学理念,从学习目标制定、教学过程优化、学习效果评价等方面进行教学改革。通过采用见习-仿真-实践教学相融合的混合式教学模式,进行专题式教学设计,强化知识点的处理,优化课程结构,成功开展了“高分子材料成型工艺与设备”课程的混合教学。实践表明:在OBE理念下,见习-仿真-实践教学相融合的混合式教学模式能较好地提升教学质量,有助于培养学生处理和解决实际问题的能力,但该教学模式还有待进一步完善。展开更多
基金the support of the National Natural Science Foundation of China(Nos.51803177,51973191,51533008,and 51636002)National Key R&D Program of China(No.2016YFA0200200)+5 种基金the China Postdoctoral Science Foundation(No.2021M690134)Hundred Talents Program of Zhejiang University(188020*194231701/113)Key Research and Development Plan of Zhejiang Province(2018C01049)the National Postdoctoral Program for Innovative Talents(No.BX201700209)the Fundamental Research Funds for the Central Universities(2021FZZX001-17),the Natural Science Foundation of Jiangsu Province(BK20210353)the Fundamental Research Funds for the Central Universities(No.30920041106).
文摘The processing capability is vital for the wide applications of materials to forge structures as-demand.Graphene-based macroscopic materials have shown excellent mechanical and functional properties.However,different from usual polymers and metals,graphene solids exhibit limited deformability and processibility for precise forming.Here,we present a precise thermoplastic forming of graphene materials by polymer intercalation from graphene oxide(GO)precursor.The intercalated polymer enables the thermoplasticity of GO solids by thermally activated motion of polymer chains.We detect a critical minimum containing of intercalated polymer that can expand the interlayer spacing exceeding 1.4 nm to activate thermoplasticity,which becomes the criteria for thermal plastic forming of GO solids.By thermoplastic forming,the flat GO-composite films are forged to Gaussian curved shapes and imprinted to have surface relief patterns with size precision down to 360 nm.The plastic-formed structures maintain the structural integration with outstanding electrical(3.07×10^(5) S m^(−1))and thermal conductivity(745.65 W m^(−1) K^(−1))after removal of polymers.The thermoplastic strategy greatly extends the forming capability of GO materials and other layered materials and promises versatile structural designs for more broad applications.
文摘“高分子材料成型工艺与设备”是高分子材料与工程专业的专业必修核心课程,该课程存在内容多、理论内容抽象难以理解、知识点分散、教学方式单一等问题。为提升教学质量,基于以成果为导向的OBE(Outcome Based Education)教学理念,从学习目标制定、教学过程优化、学习效果评价等方面进行教学改革。通过采用见习-仿真-实践教学相融合的混合式教学模式,进行专题式教学设计,强化知识点的处理,优化课程结构,成功开展了“高分子材料成型工艺与设备”课程的混合教学。实践表明:在OBE理念下,见习-仿真-实践教学相融合的混合式教学模式能较好地提升教学质量,有助于培养学生处理和解决实际问题的能力,但该教学模式还有待进一步完善。
