Abstract

Buffer solutions of random (co)polymers of N-(3-(diethylamino)propyl)-N-methylacrylamide and N,N-dipropylacrylamide, which contain from 0 to 95 mol % of N-(3-(diethylamino)propyl)-N-methyl-acrylamide units and have close molecular weights and the same degrees of polymerization (170 ± 10) are studied by the methods of potentiometric titration, light scattering, turbidimetry, refractometry, and viscometry. The samples are synthesized by the interaction of poly(acryloyl chloride) with N,N-diethyl-N ′-methyl-1,3-propanediamine and dipropylamine. The aqueous solutions are investigated in the concentration range from 0.0001 to 0.0350 g/cm³ and in pH range from 7.0 to 13.0. Temperature dependences of optical transmission I*, scattered light intensity I, and hydrodynamic sizes of scattering objects are obtained. Phase separation temperatures are determined. The results obtained are comparable with the data available for the previously studied copolymers but containing N-(3-(diethylamino)propyl)-N-methylacrylamide and N,N–diethyl-acrylamide units. It is shown that the structural phase transition and the characteristics of aqueous solutions for the compared copolymers depend on the structure of the (co)polymers and their composition.

中文翻译：

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N-(3-(二乙氨基)丙基)-N-甲基丙烯酰胺和 N,N-二丙基丙烯酰胺的热敏和 pH 敏感共聚物

摘要

N- (3-(二乙基氨基)丙基) -N-甲基丙烯酰胺和N , N-二丙基丙烯酰胺的无规(共)聚合物的缓冲溶液，其含有0至95mol％的N- (3-(二乙基氨基)丙基)-采用电位滴定法、光散射法、比浊法、折光法、粘度法等方法对分子量相近、聚合度相同（170±10）的N-甲基丙烯酰胺单元进行了研究。样品是通过聚丙烯酰氯与N , N-二乙基-N'- 甲基-1,3-丙二胺和二丙胺相互作用合成的。在0.0001至0.0350g/cm ³的浓度范围和7.0至13.0的pH范围内研究水溶液。获得了光传输I * 、散射光强度I和散射物体的流体动力学尺寸的温度依赖性。确定相分离温度。所获得的结果与先前研究的含有N- (3-(二乙氨基)丙基)-N-甲基丙烯酰胺和N , N-二乙基丙烯酰胺单元的共聚物的可用数据相当。结果表明，比较共聚物的结构相变和水溶液特性取决于（共）聚合物的结构及其组成。