Hierarchical Self-assembly of Polyamide Helical Fibers

doi:10.6023/A16100555

Acta Chim. Sinica ›› 2016, Vol. 74 ›› Issue (12): 990-994.DOI: 10.6023/A16100555 Previous Articles Next Articles

Special Issue: 聚集诱导发光

Article

聚酰胺螺旋纤维的多级自组装行为研究

黄磊^a, 黄通^b, 白永平^a, 周永丰^b

a 哈尔滨工业大学化工与化学学院哈尔滨 150001;
b 上海交通大学化学化工学院上海 200240

投稿日期:2016-10-18 发布日期:2016-12-05
通讯作者: 白永平, 周永丰 E-mail:baifengbai@hit.edu.cn;yfzhou@sjtu.edu.cn
基金资助:
项目受国家重点基础研究发展计划（973计划，No.2013CB834506）、国家杰出青年基金（No.21225420）和国家自然科学基金（Nos.21474062，91527304）资助.

Hierarchical Self-assembly of Polyamide Helical Fibers

Huang Lei^a, Huang Tong^b, Bai Yongping^a, Zhou Yongfeng^b

a School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001;
b School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai 200240

Received:2016-10-18 Published:2016-12-05
Supported by:
Project supported by the National Basic Research Program (No. 2013CB834506), the China National Funds for Distinguished Young Scholar (No. 21225420) and the National Natural Science Foundation of China (Nos. 21474062, 91527304).

1. Hierarchical Self-assembly of Polyamide Helical Fibers.PDF(375KB)

Abstract

Herein,we reported the synthesis and self-assembly of a novel temperature-responsive polyamide.The temperature-responsive polyamides (APA) was synthesized by forming-salts and solution-melt polycondensation based on the hexanedioic acid and temperature-responsive poly (propylene glycol) bis (2-aminopropyl ether).The polyamide structures of as-prepared polyamides were ascertained by Fourier transform infrared spectroscopy (FT-IR) measurement.And the gel permeation chromatography (GPC) curve showed that the as-prepared temperature-responsive polyamide possessed a distribution with a number-average molecular weight of 17800 Da and a polydispersity of 2.91.The micro differential scanning calorimetry (Micro-DSC) and UV results showed that the APA possessed a LCST of 33℃.Then a direct hydration method was used to induce the self-assembly of APA by putting polymers into deionized water with a concentration of 1.0 mg/mL at room temperature.On the other hand,we also prepared the other self-assemblies through the same direct hydration method while the temperature is at 60℃,which is beyond the LCST of as-prepared APA.The transmission electron microscope (TEM) images ascertained that the as-prepared APA should self-assemble into normal fibers at room temperature (c=1.0 mg/mL).And the formation of these long fibers are attributed to the aggregation and fusion of the primary polyamide micelles.However,very interesting,when the temperature was increased to 60℃,the atomic force microscope (AFM) and TEM results showed that the original fibers have transformed into helical fibers with more than 5 μm length.And the average helix pitch was about 35 nm.This fascinating morphology transformation should be attributed to the solubility change of PPG segments in APA fibers.When the temperature was increased to 60℃ beyond the LCST of APA,the solubility of PPG segments would decrease,and the PPG segments would also collapse.And what's more,due to an alternating hydrophilic/hydrophobic structure of APA,and the PPG segments on the surface of the APA fibers should twist.Finally,the helical APA fibers have been obtained.The present work represents a new progress for macromolecular self-assembly.

Key words: temperature-responsive, polyamides, hierarchical self-assembly, helical, fibers

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Huang Lei, Huang Tong, Bai Yongping, Zhou Yongfeng. Hierarchical Self-assembly of Polyamide Helical Fibers[J]. Acta Chim. Sinica, 2016, 74(12): 990-994.

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聚酰胺螺旋纤维的多级自组装行为研究

Hierarchical Self-assembly of Polyamide Helical Fibers

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