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Found 5 essays matching the above criteria.

  1. 1. Ion specific effects in polymer conformation

    University essay from KTH/Tillämpad fysikalisk kemi

    Author : Lovisa Svanholm; Anna Köttö; Samuel Deuda Lundkvist; [2021]
    Keywords : Poly N-isopropylacrylamid ; PNIPAM; pre-transitional chain collapse; ion specific effects; Hoffmeister series; LCST; diffusion NMR; self-diffusion NMR; fractionation; kosmotropes; chaotropes; inversion recovery experiment;

    Abstract : It is well known that ions affect polymers in specific ways not solely based on electric charge, usually referred to as the Hoffmeister effect or ion specific effects. Poly(N-isopropylacrylamid) (PNIPAM) is a thermosensitive polymer with a LCST at 32℃. READ MORE

  3. 2. Simulations of polymer solutions displaying a lower critical solution temperature

    University essay from Lunds universitet/Kemiska institutionen

    Author : Sandra Larsson; [2018]
    Keywords : Monte Carlo simulations; polymer solutions; lower critical solution temperature; thermoresponsive polymers; LCST; theoretical chemistry; teoretisk kemi; Chemistry;

    Abstract : Thermoresponsive polymers with a lower critical solution temperature, LCST, have attracted interest in the development of new ``smart materials'', which change properties in response to external stimuli. Polymers with an LCST near physiological temperatures are especially relevant in biomedical applications, most notably perhaps in drug delivery systems. READ MORE

  4. 3. Ion association to poly(N-isopropylacrylamide) by diffusion and electrophoretic NMR

    University essay from KTH/Skolan för kemivetenskap (CHE)

    Author : Cedrik Wiberg von Schantz; [2013]
    Keywords : PNIPAM; poly N-isopropylacrylamide ; electrophoretic NMR; diffusion NMR; LCST; ion association;

    Abstract : PNIPAM (poly(N-Isopropylacrylamide)) is a well-known thermoresponsive polymer. Dissolved in water, it shows a structural change at 32 oC, above which the polymer folds together, and a phase separation occurs. READ MORE

  5. 4. Microgels at ultrahigh densities : a small angle neutron scattering study

    University essay from Lunds universitet/Kemiska institutionen

    Author : Sofi Nöjd; [2012]
    Keywords : Fysikalisk kemi; Chemistry;

    Abstract : Populärvetenskaplig sammanfattning Microgelpartiklar är runda partiklar som har förmågan att ändra storlek beroende på olika yttre påverkan. I detta projekt har vi tittat på partiklar som blir upp till 10 gånger mindre när temperaturen höjs från 15˚C till 39˚C. READ MORE

  6. 5. Modification of nanofibrillated cellulose with stimuli-responsive polymers

    University essay from KTH/Skolan för kemivetenskap (CHE)

    Author : Carmen Cobo Sanchez; [2012]
    Keywords : thermoresponsive; nanofibrillated cellulose; biocomposites; block-copolymer; stimuliresponsive;

    Abstract : Research of new sustainable and low cost materials, such as cellulose, is of high interest. Modifications of the cellulose can be performed in order to create a “smart” material which responds to external stimuli, such as variations in pH and temperature, by changing its properties. READ MORE