Enhancing the mechanical properties of electrospun polyester mats by heat treatment
Enhancing the mechanical properties of electrospun polyester mats by heat treatment
复制标题
DOI：
10.3144/expresspolymlett.2015.6
复制
发表时间：
2015-01-01
影响因子：
3.3
通讯作者：
Rashkov, I.
中科院分区：
文献类型：
--
作者：
Kancheva, M.;Toncheva, A.;Rashkov, I.
通过静电纺丝和静电纺丝与电喷雾相结合的方法制备了基于聚（L-乳酸）（PLA）和聚（ε-己内酯）（PCL）的具有针对性设计的微纤维材料。采用了几种方法：（i）两种聚合物的共同溶液的电纺丝，（ii）PLA和PCL的两种单独溶液的同时电纺丝，（iii）PLA溶液的电纺丝与PCL溶液的电喷雾结合，和（iv）通过单独PLA和PCL溶液的电纺丝的交替逐层沉积。在PCL的熔融温度（60 ° C）下加热垫，从而实现PCL纤维/颗粒的熔融和纤维的热密封。进行热处理的垫的特征在于更大的平均纤维直径和降低的水接触角的值相比，原始垫。热处理影响其热稳定性，导致聚乳酸的结晶度增加，而PCL的降低。与未处理的纤维材料相比，所有垫的特征在于热处理后增强的机械性能。
Microfibrous materials with a targeted design based on poly(L-lactic acid) (PLA) and poly(epsilon-caprolactone) (PCL) were prepared by electrospinning and by combining electrospinning and electrospraying. Several approaches were used: (i) electrospinning of a common solution of the two polymers, (ii) simultaneous electrospinning of two separate solutions of PLA and PCL, (iii) electrospinning of PLA solution in conjunction with electrospraying of PCL solution, and (iv) alternating layer-by-layer deposition by electrospinning of separate PLA and PCL solutions. The mats were heated at the melting temperature of PCL (60 degrees C), thus achieving melting of PCL fibers/particles and thermal sealing of the fibers. The mats subjected to thermal treatment were characterized by greater mean fiber diameters and reduced values of the water contact angle compared to the pristine mats. Heat treatment of the mats affected their thermal stability and led to an increase in the crystallinity degree of PLA incorporated in the mats, whereas that of PCL was reduced. All mats were characterized by enhanced mechanical properties after thermal treatment as compared to the non-treated fibrous materials.