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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Hard Segment Engineering in Thermoplastic Polyurethane Directs Interfacial Microphase Separation for Moisture

Zhi Yang1,2, Peng Zhang1,2, Dahai Zeng1,2

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A novel polymer composite effectively protects humidity-sensitive products by integrating molecular sieves directly into a polypropylene matrix. Optimizing the thermoplastic polyurethane hard segment ratio creates a continuous network for superior moisture adsorption and faster kinetics.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Conventional desiccants in sachets pose space and safety issues for packaging.
  • Incorporating desiccants into polymer matrices is challenging due to poor filler dispersion and discontinuous transport pathways.

Purpose of the Study:

  • To design and investigate a multiphase composite for enhanced moisture adsorption.
  • To understand how thermoplastic polyurethane (TPU) hard segment (HS) ratio influences composite microstructure and performance.

Main Methods:

  • Fabrication of a polypropylene/polyethylene glycol/thermoplastic polyurethane/molecular sieve (PP/PEG/TPU/MS) composite with varying TPU HS ratios.
  • Microstructural analysis using Fourier transform infrared spectroscopy (FTIR).
  • Moisture absorption kinetics and capacity testing, including Fickian diffusion modeling.

Main Results:

  • A TPU HS ratio of 42% yielded a continuous interpenetrating hydrophilic network with optimal mesopore size and low density.
  • Strong hydrogen-bonding interactions at 42% HS promoted uniform molecular sieve dispersion and interfacial adhesion.
  • The PP/42-TPU/PEG/MS composite demonstrated the highest equilibrium moisture capacity and fastest adsorption kinetics.

Conclusions:

  • Controlling the TPU HS ratio is critical for developing high-performance moisture-adsorbing polymer composites.
  • The developed composite offers effective protection for humidity-sensitive products, outperforming conventional methods.
  • Moisture transport is governed by diffusion, influenced by a plasticization effect at higher relative humidity.