Factors Influencing Orientations of Covalently-Attached and Doped Aromatic Groups in Stretched Polyethylene Films
Factors Influencing Orientations of Covalently-Attached and Doped Aromatic Groups in Stretched Polyethylene Films
复制标题
影响拉伸聚乙烯薄膜中共价连接和掺杂芳族基团取向的因素
DOI：
10.1021/jp034493g
复制
发表时间：
2003
影响因子：
3.3
通讯作者：
R. Weiss
中科院分区：
文献类型：
--
作者：
Caihua Wang;and Jinqi Xu;R. Weiss
在拉伸聚烯烃薄膜的内部位置测量了共价连接和掺杂的9-蒽基和1-芘基的线性极化。探讨了聚合物的结晶度、芳香族基团的浓度、掺杂分子上取代基的长度或共价键的链系对极化程度的影响。结果表明，比较掺杂基团和共价基团的取向参数在分析拉伸诱导取向的因素中是有用的。甚至在薄膜拉伸之前，蒽基和芘基更倾向于驻留在界面区域而不是非晶态区域，它们取向的特异性是由与周围聚合物链相互作用的性质决定的。取向因子的大小取决于聚合物的结晶度和取代基或链链的长度，但与芳香族的浓度无关。
Linear polarizations have been measured for covalently attached and doped 9-anthryl and 1-pyrenyl groups residing in interior sites of stretched polyolefinic films. The influences of polymer crystallinity, the concentration of aromatic groups, and the length of the substituents attached to doped molecules or of the tethers to polymer chains of covalently attached species on the degree of polarization have been explored. The results demonstrate the utility of comparing orientational parameters from doped and covalently attached groups in analyzing the factors responsible for stretch-induced orientation. The anthryl and pyrenyl groups prefer to reside in interfacial regions more than amorphous regions even before film stretching, and the specificity of their orientations is determined by the nature of interactions with surrounding polymer chains. The magnitudes of orientation factors are dependent on polymer crystallinity and substituent or tether length, but are independent of aromatic group concentrations...