Effect of Side Chain Structure on the Conformation of Poly(<i>N</i>-propargylalkylamide)
作者:Ryoji Nomura、Junichi Tabei、Toshio Masuda
DOI:10.1021/ma0117155
日期:2002.4.1
homopolymerized or copolymerized with a chiral comonomer, (R)-N-propargyl-3,7-dimethyloctanamide (2), in the presence of a Rh initiator to establish the relationship between the main-chain conformation and the structure of the pedant groups. 1H NMR and viscosity measurements of the homopolymers revealed that the structure of the pendant groups markedly influences the rigidity of the polymer backbone and the stability
非手性Ñ -propargylalkylamides(1A - 1克,HC⋮CCH 2 NHR)具有各种烷基(R = CH 3,C 2 H ^ 5,C 3 H ^ 7,我-C 3 ħ 7,我-C 4 ħ 9,n -C 5 H 11,n -C 7 H 15)与手性共聚单体(R)-N均聚或共聚-炔丙基-3,7-二甲基辛酰胺(2),在Rh引发剂的存在下建立主链构象与pedant基团结构之间的关系。均聚物的1 H NMR和粘度测量表明,侧基的结构显着影响聚合物主链的刚性和螺旋构象的稳定性。使用具有直链或α-支链烷基的非手性共聚单体的共聚显示出对螺旋构象的不良或无协同作用,这意味着这些聚合物以无序状态存在。另一方面,对于具有β-支链烷基链的聚合物(poly(1e),R =i- C 4 H 9),这由1e至2的进料比与共聚物的旋光度之间清晰的正非线性关系证明。紫外可见光谱研究表明,在CHCl 3中,螺