Small-Angle Neutron Scattering Analysis of Blends with Very Strong Intermolecular Interactions: Polyamide/Ionomer Blends
Small-Angle Neutron Scattering Analysis of Blends with Very Strong Intermolecular Interactions: Polyamide/Ionomer Blends
复制标题
具有很强分子间相互作用的共混物的小角中子散射分析：聚酰胺/离聚物共混物
DOI：
10.1021/ma0341972
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发表时间：
2003
期刊：
影响因子：
5.5
通讯作者：
R. Weiss
中科院分区：
文献类型：
--
作者：
R. Tucker;C. Han;A. Dobrynin;R. Weiss
用小角中子散射法研究了磺化聚苯乙烯离聚体锂盐（Li−SPS）与甲基化聚酰胺（mPA）的部分混溶。共混物表现出较低的临界溶液温度行为（LCST），且LCST随离聚体磺化程度的增加而增加。当离聚物的磺化水平低于20 mol %时，散射结构因子出现峰值。随着磺化水平的升高和温度的升高，峰的位置向低波方向移动。峰的起源是一个相关空穴，这是由于在酰胺和磺酸基之间形成离子偶极子络合物而形成接枝共聚物所必需的。络合作用抑制了未磺化聚苯乙烯与聚酰胺相分离的趋势，但也使共混物的浓度波动较大。浓度波动的大小和强度随温度的升高而增大，即…
Partially miscible blends of the lithium salt of sulfonated polystyrene ionomer (Li−SPS) and a methylated polyamide (mPA) were studied using small-angle neutron scattering. The blends exhibit lower critical solution temperature behavior (LCST), and the LCST increases with increasing sulfonation level of the ionomer. When the sulfonation level of the ionomer was below 20 mol %, a peak was observed in the scattering structure factor. The position of the peak moved to lower wavevector with increasing sulfonation level and with increasing temperature. The origin of the peak was a correlation hole due to the essential formation of a graft copolymer by the formation of an ion−dipole complex between the amide and sulfonate groups. The tendency of the unsulfonated polystyrene to phase separate from the polyamide was suppressed by the complexation, but it also produced large concentration fluctuations in the blends. The size and intensity of the concentration fluctuations increased with increasing temperature, i.e...