文章信息/Info

Title:

Investigation of the glass transition of polycarbonate/multi-Walled carbon nanotube composites

作者:

閆曉麗1; 2段培1; 2 張磊1; 3 魏麗喬1; 3 許并社1; 2

1. 太原理工大學新材料界面科學與工程教育部重點實驗室，山西 太原 030024 ；2. 太原理工大學新材料工程技術(shù)研究中心，山西 太原 030024 ；3. 太原理工大學材料科學與工程學院，山西 太原 030024

Author(s):

Yan Xiaoli1; 2;  Duan Pei1; 2;  Zhang Lei1; 3;  Wei Liqiao1;  3;  Xu Bingshe1; 2

1. Key Laboratory of Interface Science and Engineering in Advanced Materials (Taiyuan University of Technology), Ministry of Education, Taiyuan, Shanxi 030024, PR China 2. Research Center of Advanced Materials Science and Technology, Taiyuan University of Technology, Taiyuan, Shanxi 030024, PR China 3. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, Shanxi 030024, PR China

關(guān)鍵詞:

碳納米管; 正電子湮沒壽命; 玻璃化轉(zhuǎn)變溫度

DOI:

10.7502/j.issn.1674-3962.2015.05.05

文獻標志碼:

A

摘要:

碳納米管（CNTs）自發(fā)現(xiàn)以來，由于其優(yōu)異的物理、化學性能等使其在很多領(lǐng)域都有潛在的應(yīng)用價值，尤其是作為高分子材料改性填料而備受關(guān)注。但到目前為止，CNTs填充對復(fù)合材料宏觀性能影響的微觀機理還不清楚，CNTs的加入對聚合物的微觀結(jié)構(gòu)產(chǎn)生什么樣的影響，而微觀結(jié)構(gòu)又如何影響復(fù)合材料的宏觀性能等，仍然是有待深入研究的重要課題。本文采用溶液共混-共沉淀的方法制備了聚碳酸酯（PC）/多壁碳納米管(MWCNTs)復(fù)合材料。利用正電子湮沒壽命譜儀研究了自由體積隨溫度的變化。利用三種不同的實驗方法：正電子湮沒壽命譜測量、動態(tài)力學熱分析測量和示差掃描量熱測量得到了復(fù)合材料變化趨勢一致的玻璃化轉(zhuǎn)變溫度(Tg)，都是隨著碳納米管含量的增加而降低。

Abstract:

Since carbon nanotubes (CNTs) were first discovered in 1990, due to its excellent physical properties, it has become a potential material in many fields, especially in the field of polymers filled with CNTs, which have been received increasing attentions. Although significant progress in mechanical, thermal, electrical and rheological properties has been made in developing nanocomposites with different polymer matrices, a general understanding for the mechanism has not yet emerged. In other words, how the addition of nanofillers can affect the microstructure of polymer? And how the microstructures can affect the macropropeties? A major direction in the further development of nanocomposites is finding out the simple structure-property relationship. In this report, polycarbonate (PC)/multi-walled carbon nanotube (MWCNT) composites have been prepared by solution mixing. The influences of temperature on the free volume of MWCNT/PC composites were investigated by positron annihilation lifetime spectroscopy (PALS). Three methods, including PALS, dynamic mechanical analysis and differential scanning calorimetry were used to determine the glass transition temperature (Tg) of PC/MWCNT composites. The experimental results indicated that the higher the MWCNT contents, the lower the Tg, which attributes to the large free volume hole and the enhanced polymer mobility in PC/MWCNT composites with higher MWCNT contents.