私密直播全婐app免费大渔直播,国产av成人无码免费视频,男女同房做爰全过程高潮,国产精品自产拍在线观看

當前位置:群英聚首 > 論文著作 > 正文
Nanofibers with Very Fine Core-Shell Morphology from Anisotropic Micelle of Amphiphilic Crystalline-Coil Block Copolymer
來源:陳思翀教授個人網站 發布日期:2014-05-04
作者:F. Y. Zhai, W. Huang, G. Wu, X. K. Jing, M. J. Wang, S. C. Chen*, Y. Z. Wang, I. J. Chin, Y. Liu
關鍵字:single spinneret electrospinning, core-shell nanofiber, crystalline-coil copolymer, anisotropic micelle
論文來源:期刊
具體來源:ACS Nano
發表時間:2013年
A novel and facile strategy, combining anisotropic micellization of amphiphilic crystalline-coil copolymer in water and re-assembly during single spinneret electrospinning, was developed for preparing nanofibers with very fine core-shell structure. Polyvinyl alcohol (PVA) and polyethylene glycol-block-poly(p-dioxanone) (PEG-b-PPDO) were used as the shell and the crystallizable core layer, respectively. The core-shell structure could be controllably produced by altering concentration of PEG-b-PPDO, and the chain length of the PPDO block. The morphology of the nanofibers was investigated by Transmission Electron Microscope (TEM) and Scanning Electron Microscope (SEM). X-ray rocking curve measurements were performed to investigate the degree of ordered alignment of the PPDO crystalline lamellae in the nano fiber. The results suggested that the morphology of nano particles in spinning solution plays very important role in determining the phase separation of nano fibers. The amphiphilic PEG-b-PPDO copolymer self assembled into star anise-nano aggregates in water solution induced by the crystallization of PPDO blocks. When incorporated with PVA, the interaction between PVA and PEG-b-PPDO caused a morphological transition of the nano aggregates from star anise to small flake. For flake-like particles, their flat surface is in favor of compact stacking of PPDO crystalline lamellae and interfusion of amorphous PPDO in the core of nano fibers, leading to a relatively ordered alignment of PPDO crystalline lamellae and well defined core-shell phase separation. However, for star anise-like nano aggregates, their multi-branched morphology may inevitably prohibit the compact interfusion of PPDO phase, resulting in a random micro-phase separation.
Copyright © 2005 Polymer.cn All rights reserved
中國聚合物網 版權所有
經營性網站備案信息

京公網安備11010502032929號

工商備案公示信息

京ICP證050801號

京ICP備12003651號

主站蜘蛛池模板: 开平市| 武乡县| 湛江市| 古交市| 庆元县| 古浪县| 修文县| 改则县| 冀州市| 西乌珠穆沁旗| 巴里| 大丰市| 宝应县| 化隆| 延边| 渭南市| 丁青县| 重庆市| 镇康县| 邵东县| 滨州市| 浦东新区| 靖宇县| 昌平区| 绥德县| 华宁县| 桂东县| 泰宁县| 焉耆| 海林市| 印江| 青神县| 招远市| 庄河市| 宜州市| 鄂尔多斯市| 应用必备| 陆河县| 南召县| 阿城市| 上蔡县|