Агрегація гідроксипропілцелюлози в розбавлених розчинах з іонами солей

Автор(и)

  • V.I. Kovalchuk Taras Shevchenko National University of Kyiv, Faculty of Physics
  • Yu.F. Zabashta Taras Shevchenko National University of Kyiv, Faculty of Physics
  • L.A. Bulavin Taras Shevchenko National University of Kyiv, Faculty of Physics

DOI:

https://doi.org/10.15407/ujpe71.6.529

Ключові слова:

гiдроксипропiлцелюлоза, iони солей, агрегацiя, рiвняння Кана–Гiллiярда

Анотація

Методом математичного моделювання дослiджено кiнетику фазового переходу водного розчину гiдроксипропiлцелюлози з iонами солей. На основi нелiнiйного рiвняння Кана– Гiллiярда зi стохастичним членом, параметром гiдрофобностi та рухливiстю, що залежить вiд концентрацiї полiмера, виконано симуляцiю фазового роздiлення на простiй одновимiрнiй ґратцi Флорi. Для набору значень параметра гiдрофобностi отримано данi про змiну середнiх значень розмiрiв агрегатiв та їх маси. За результатами моделювання можна видiлити три стадiї спiнодального розпаду: ранню, промiжну й кiнцеву. Встановлено, що для промiжної й кiнцевої стадiй кiнетика зростання маси кластерiв описується скейлiнговими залежностями з показниками та часом кросовера, якi визначають перехiд вiд режиму накопичення маси агрегатiв внаслiдок ефектiв поверхневого натягу до дифузiйного режиму. Показано, що змiну середнього розмiру кластерiв можна представити скейлiнговою функцiєю з показником, близьким до 1/3, типовим для систем iз консервативним скалярним параметром порядку. Iз результатiв комп’ютерної симуляцiї випливає, що збiльшення густини мiжфазної енергiї (пiдсилення гiдрофобних взаємодiй) приводить до зростання розмiрiв полiмерних агрегатiв.

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Опубліковано

2026-05-25

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