在低pH下形成的作为可溶性氢键互聚物复合物的核-壳纳米粒子的表征
Characterization of the Core-Shell Nanoparticles Formed as Soluble Hydrogen-Bonding Interpolymer Complexes at low pH
摘要：
研究了聚丙烯酸（PAA）与聚（丙烯酸-co-2-丙烯酰胺基-2-甲基-1-丙磺酸）-接枝-聚（N，N-二甲基丙烯酰胺）（P（AA-co-AMPSA）-g-PDMAM）在pH = 2.0时形成的可溶性氢键高分子复合物。粘度研究表明，在半稀溶液中，由于接枝共聚物的阴离子P（AA-co-AMPSA）主链的互连，通过接枝共聚物的PDMAM侧链与PAA之间形成的复合物，在瞬时网络中形成物理凝胶。动态和静态光散射测量，结合小角中子散射测量，表明在稀溶液中形成的核-壳胶体纳米粒子，包括由阴离子P（AA-共-AMPSA）电晕包围的不溶性PAA/PDMAM核。即使在半稀释溶液中形成较大的团簇，不溶性核的大小实际上保持稳定。在环境条件下进行的原子力显微镜，揭示了粒子的崩溃和扁平后，沉积在基板上，与干燥的疏水性核心的尺寸接近。
英文摘要：
The formation of soluble hydrogen-bonding interpolymer complexes between poly(acrylic acid) (PAA) and poly(acrylic acid-co-2-acrylamido-2-methyl-1-propane sulfonic acid)-graft-poly(N, N dimethylacrylamide) (P(AA-co-AMPSA)-g-PDMAM) at pH = 2.0 was studied. A viscometric study showed that in semidilute solution a physical gel is formed, due to the interconnection of the anionic P(AA-co-AMPSA) backbone of the graft copolymer, in a transient network, by means of the complexes formed between the PDMAM side chains of the graft copolymer and PAA. Dynamic and static light scattering measurements, in conjunction with small angle neutron scattering measurements, suggest the formation of core-shell colloidal nanoparticles in dilute solution, comprised by an insoluble PAA/PDMAM core surrounded by an anionic P(AA-co-AMPSA) corona. Even if larger clusters are formed in semidilute solution, the size of the insoluble core remains practically stable. Atomic force microscopy performed under ambient conditions, reveal that the particles collapse and flatten upon deposition on a substrate, with dimensions close to the ones of the dry hydrophobic core.
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