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首页> 外文期刊>Journal of Macromolecular Science. Pure and Applied Chemistry >Self-organization of amphiphilic copolymers into nanoparticles: Study by H-1 NMR longitudinal relaxation time
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Self-organization of amphiphilic copolymers into nanoparticles: Study by H-1 NMR longitudinal relaxation time

机译：两亲共聚物自组织成纳米颗粒：H-1 NMR纵向弛豫时间的研究

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摘要

The aggregation and nanoparticle formation of a novel amphiphilic polymer 1 based on polyethylene glycol has been studied by H-1 NMR longitudinal relaxation time (T-1). The T-1 of proton NMR, which may be associated with the mobility of molecular chains showed different trends when the amphiphilic polymer was dissolved in aqueous and organic solvents. It was observed that the T-1 relaxation time of protons on hydrophobic chains decreases with the increase in concentration in aqueous media and stabilizes above the critical micelle concentration (CMC). The stabilization of T-1 relaxation time of protons on hydrophobic chains in aqueous media occurs because of the aggregation of hydrophobic side chains in the core of nanospheres formed due to hydrophobic interactions. However, in organic solvent, the T-1 of protons on hydrophobic as well as hydrophilic chain of amphiphilic polymer did not show any evidence of particle formation. Thus, the restricted motion of the side-chain protons may be indicative of nanoparticle formation in aqueous solution and non-formation of such particles in organic Solution.
机译：通过H-1NMR纵向弛豫时间（T-1）研究了基于聚乙二醇的新型两亲聚合物1的聚集和纳米颗粒形成。当两亲性聚合物溶解在水性和有机溶剂中时，质子核磁共振的T-1可能与分子链的迁移性有关。观察到，在水性介质中，质子在疏水链上的T-1弛豫时间随浓度的增加而降低，并稳定在临界胶束浓度（CMC）以上。质子在水性介质中疏水链上的T-1弛豫时间稳定，是由于疏水相互作用形成的纳米球核中疏水侧链的聚集所致。但是，在有机溶剂中，两亲聚合物的疏水链和亲水链上的质子的T-1均未显示出颗粒形成的迹象。因此，侧链质子的受限制的运动可以指示在水溶液中形成纳米颗粒以及在有机溶液中不形成这种颗粒。

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