检索结果-南通市图书馆

nonisothermal crystallization.AND MORPHOLOGY OF POLY(BUTYLENE SUCCINATE)/LAYERED DOUBLE HYDROXIDE NANOCOMPOSITES

Chinese Journal of Polymer Science 2013年第1期31卷 187-200页

作者： Mei-qiu Zhan Guang-yi Chen 魏志勇 Yu-mei Shi Wan-xi Zhang School of Material Science and Engineering Jilin University School of Automotive Engineering Dalian University of Technology

Biodegradable poly（butylene succinate）（PBS） and layered double hydroxide （LDH） nanocomposites were prepared via melt blending in a twin-screw extruder. The morphology and dispersion of LDH nanoparticles within PBS matrix were characterized by transmission electron microscopy （TEM）, which showed that LDH nanoparticles were found to be well distributed at the nanometer level. The nonisothermal crystallization.behavior of nanocomposites was extensively studied using differential scanning calorimetry （DSC） technique at various cooling rates. The crystallization.rate of PBS was accelerated by the addition of LDH due to its heterogeneous nucleation effect; however, the crystallization.mechanism and crystal structure of PBS remained almost unchanged. In kinetics analysis of nonisothermal crystallization. the Ozawa approach failed to describe the crystallization.behavior of PBS/LDH nanocomposites, whereas both the modified Avrami model and the Mo method well represented the crystallization.behavior of nanocomposites. The effective activation energy was estimated as a function of the relative degree of crystallinity using the isoeonversional analysis. The subsequent melting behavior of PBS and PBS/LDH nanocomposites was observed to be dependent on the cooling rate. The POM showed that the small and less perfect crystals were formed in nanocomposites.

关键词： Poly(butylene succinate) Layered double hydroxide nonisothermal crystallization.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Effects of Branches on the crystallization.Kinetics of Polypropylene-gPolystyrene and Polypropylene-g-Poly(n-butyl acrylate) Graft Copolymers with Well-defined Molecular Structures

引用

Chinese Journal of Polymer Science 2014年第3期32卷 333-349页

作者： Lu Wang Zhi-wei Jiang Feng Liu Zhi-jie Zhang 唐涛 State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied ChemistryChinese Academy of Sciences University of Chinese Academy of Sciences

Effects of branches on the crystallization.kinetics of polypropylene-g-polystyrene （PP-g-PS） and polypropylene-g- poly（n-butyl acrylate）（PP-g-PnBA） graft copolymers with well-defined molecular structures were systematically investigated by DSC. The Avrami equation was used to analyze the isothermal crystallization.process, while the analysis of nonisothermal crystallization.process was based on the Jeziorny-modified Avrami model and Mo model. The kinetics results of isothermal and nonisothermal crystallization.verified the peculiar effects of branches on the crystallization.process of PP backbones in PP-g-PS and PP-g-PnBA graft copolymers： on one hand, the interaction between branches （n-n interaction between PS branches, or dipole-dipole interaction between PnBA branches） restrained the mobility and reptation ability of the PP backbones, which hindered the crystallization.process; on the other hand, the heterogeneous nucleation effect resulting from the branched structure and fluctuation-assisted nucleation mechanism （caused by microphase separation between the PS or PnBA rich phase and the PP rich phase） became more pronounced with increasing branch length, which facilitated the crystallization.process.

关键词： Polypropylene Polypropylene-g-polystyrene graft copolymer Polypropylene-g-poly(n-butyl acrylate) graftcopolymer Isothermal crystallization nonisothermal crystallization.

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：