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Adsorption-Reaction Processes Between Gelatin and PDMS-E Emulsion Droplets.

Huijun Ma¹, Yuai Hua¹, Zhaosheng Hou^1,2

¹Shandong Provincial Key Laboratory of Molecular Engineering, School of Mathematics and Statistics, Qilu University of Technology Library, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, P. R. China.

|June 7, 2021

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The study shows how droplet size and reaction time control gelatin adsorption and reactions with polydimethylsiloxane (PDMS-E) droplets. This process forms colloidal particles with applications in water resistance and flame retardancy.

Area of Science:

Materials Science
Colloid Science
Polymer Chemistry

Background:

Polydimethylsiloxane (PDMS-E) emulsions are versatile materials.
Understanding interfacial reactions is key for material property control.
Gelatin is a biopolymer with potential for surface modification.

Purpose of the Study:

To investigate the influence of droplet size and reaction time on gelatin-PDMS-E interactions.
To elucidate the mechanisms of physical adsorption and chemical reactions.
To explore the properties of resulting colloidal particles and coated materials.

Main Methods:

Controlled emulsion preparation of PDMS-E.
Varied reaction times and droplet sizes (100-1000 nm).
Analysis of adsorption and reaction kinetics.

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Characterization of colloidal particle morphology.

Water resistance and flammability testing of coated tissues.

Main Results:

Gelatin adsorption on PDMS-E droplets is initially size-independent.
Small droplets (<410 nm) showed agglomeration after adsorption.
Middle (410-680 nm) and large (>680 nm) droplets exhibited nucleophilic reactions forming core-shell or multi-layered particles.
Reaction onset and particle morphology depend on droplet size and time.

Conclusions:

Droplet size and reaction time are critical parameters for controlling gelatin-PDMS-E adsorption-reaction processes.
Tailoring these parameters enables the formation of specific colloidal particle structures.
Coating soft tissue paper with large droplets resulted in enhanced water and flame resistance.