单根聚己内酯电纺亚微米纤维的动力学特性分析  

A DYNAMIC INVESTIGATION OF THE PROPERTIES OF A SINGLE-STRAND,ELECTROSPUN PCL SUB-MICRO FIBER

作　　者：孙亮[1] 王珺[2] 韩平畴[3] 

机构地区：[1]复旦大学力学与工程科学系,上海200433 [2]复旦大学材料科学系,上海200433 [3]北京大学先进材料和纳米技术系,北京100871

出　　处：《高分子学报》2009年第6期535-539,共5页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号50873005);广东科委项目(项目号2007B090400123)资助项目

摘　　要：通过静电纤维制造技术得到直径范围在100～500nm的PCL亚微米纤维,并使用信号发生器和压电片联用对收集到的单根纤维进行振动实验,由共振频率数据得到单根纤维的弹性模量,并同时对直径的测量方法进行了修正.实验结果显示,PCL亚微米纤维的弹性模量随直径变化而显著增加,存在明显的尺寸效应.通过引入应变梯度的振动模型对实验中观测到的尺寸效应进行了理论解释,等效弹性模量的理论预测值与实验数据吻合良好.The polymer micro- or nano- fibers have been rapidly gaining popularity as a construction matrix for tissue engineering scaffolds. This paper presents a dynamic investigation of the poly（ε-caprolactone）（PCL） submicro fibers with diameters ranging from 100 nm to 500 nm by electrospinning method. To obtain the dynamic properties,the fiber was placed on a surface which had a groove of 100 μm width, and the experiments using a functional generator and piezo-tablet were conducted on a vibrating single-strand fiber. The amplitude and driving frequency can be observed by using the ultra-high optical microscope and functional generator respectively. Additionally, since the dynamic property is highly sensitive to the fiber diameter, and real fibers have an ellipsoidal cross-section, it is necessary to correct the experimental data. The equal diameter is defined and the value can be measured by using the AFM equipment. The elastic modulus can be obtained when the PCL fiber beam arrived at its first resonant frequency. Our measurements show that its elastic modulus exhibits an inverse size dependency with the fiber diameter. The elastic modulus of the fiber increased obviously when its diameter was reduced past a threshold size. A dynamics-based strain gradient model was presented to correlate with the experimental data, and it appeared to explain the phenomenon quite accurately.

关 键 词：聚合物亚微米纤维 尺寸效应 动力学实验 应变梯度理论 

分 类 号：TB383.1[一般工业技术—材料科学与工程]