摘要
利用基质辅助激光解吸电离飞行时间质谱(MALDI-TOF MS)对两种对位芳纶短切纤维(A1-PPTA、A2-PPTA)及其打浆粉末的端基结构进行分析,通过谱图特征峰与端基结构的对应关系,分析端基结构与反应机理的关联性及打浆过程产生粉末的原因。结果显示,A1-PPTA和A2-PPTA的聚合过程均采用了近似等摩尔的反应物来控制聚合过程;A2-PPTA的聚合过程发生溶剂链转移的几率更高;A2-PPTA中存在较多不利于纤维强度的端基结构,导致其打浆过程中产生更多粉末。
Matrix-assisted laser desorption / ionization time-of-flight mass spectrometry( MALDI-TOF MS) was used to study the end-group structure of two kinds of poly( p-phenylene terephthalamide)-PPTA short-cut fiber( A1-PPTA fiber and A2-PPTA fiber) and the PPTA powder produced by beating the PPTA fibers during the paper-making process. The basic database of the spectral characteristic peak and the endgroup structure was established to reveal the relationship between the reaction mechanism and the end-group structure,and to find the producing causes of the PPTA powder during the beating process. The results showed that polymerization process for A1-PPTA fiber and A2-PPTA fiber were both carried out with an approximate equivalent amount of reactants. The probability of chain transferring to solvent in A2-PPTA fiber was higher than A2-PPTA fiber; The existing of more end-group structures which were not benefit to fiber's mechanical strength in A2-PPTA fiber caused more large amount of powder in the beating process.
出处
《中国造纸》
CAS
北大核心
2015年第10期30-35,共6页
China Pulp & Paper
关键词
基质辅助激光解吸电离飞行时间质谱
对位芳纶纤维
打浆粉末
端基结构
matrix-assisted laser desorption / ionization time-of-flight mass spectrometry(MALDI-TOF MS)
PPTA fiber
beating powder
end-group structure