PANI-DBSA/PAN共混体系的相容性及导电性能

以三氯甲烷/二甲基亚砜为混合溶剂,采用溶液共混的方法制备PANI-DBSA/PAN导电薄膜.采用扫描电镜、差示扫描量热仪、红外光谱及广角X射线衍射分析研究了共混体系的相容性及相态结构.结果表明,PANI-DBSA在PAN基体中分布均匀,聚集尺寸为纳米级,其较均匀的分布及较小的聚集尺寸使其出现较低的逾渗阈值(低于4%);PANI-DBSA/PAN的共混体系只有一个玻璃化转变温度,居于纯PAN和PANI-DBSA之间,表明两者之间具有良好的相容性;FTIR分析证实PANI-DBSA与PAN之间存在氢键相互作用,氢键发生在PANI-DBSA的氨基与PAN共聚物中的羰基之间,这两种聚合物之间的氢键相互作用是导致PANI-DBSA与PAN之间良好相容性的内因.

Compatibility and Conducting Properties of PANI-DBSA/PAN Blend

Conducting composites of polyacrylonitrile(PAN) copolymer containing 10% mass fraction methylacrylate and dodecylbenzene sulfonic acid doped polyaniline(PANI-DBSA) were prepared by solution blending of the two components. The electrical properties of the blends were characterized by means of electrical conductivity measurements and the phase structures were investigated via scanning electron microscopy(SEM), X-ray diffraction(XRD), FTIR spectroscopy and different scanning calorimetry(DSC). DSC measurements showed that there was only one T g for each blend and the values of T g varied with the change of the PANI-DBSA content. This implies that the PANI-DBSA/PAN blend is at least partially compatible. The formation of the hydrogen bonding between the carbonyl groups in PAN copolymer and the imines groups in PANI-DBSA was identified by the FTIR spectra. XRD demonstrated that the intrinsic layered arrangement of PANI-DBSA was destroyed in the blends. Nanosize network structure of PANI-DBSA dispersed in PAN matrix and the so-called phase reverse occurring in the skin layer of the film samples at low PANI-DBSA loading were observed by SEM. {