Synthesis and characterization of segmented polyurethanes based on amphiphilic polyether diols

Area of Science:

• Polymer Chemistry
• Materials Science

Background:

• Segmented polyurethanes (SPUs) are versatile polymers with applications in various fields.
• Tailoring SPU properties requires understanding the influence of constituent monomers and their ratios.

Purpose of the Study:

• To synthesize and characterize novel segmented polyurethanes (SPUs).
• To investigate the impact of different polyols, diisocyanates, and chain extenders on SPU properties.
• To analyze the microphase morphology, including phase separation and mixing, within the synthesized SPUs.

Main Methods:

• Synthesis of SPUs using polyethylene glycol (PEG), polypropylene glycol (PPG), and Pluronics as soft segments.
• Utilized various diisocyanates: 4,4-diphenylmethane diisocyanate (MDI), 4,4-dicyclohexylmethane diisocyanate (MDCI), hexamethylene diisocyanate (HMDI), and isophorone diisocyanate (IPDI).
• Employed 1,4-butane diol (BD) and ethylene diamine (ED) as chain extenders.
• Characterization techniques included infrared spectroscopy (IR), nuclear magnetic resonance (NMR), and differential scanning calorimetry (DSC).

Main Results:

• Successfully prepared a series of SPUs with varying compositions.
• Characterization data provided insights into the chemical structure and thermal properties of the synthesized polymers.
• Analysis revealed distinct microphase morphologies, indicating varying degrees of phase separation and mixing.

Conclusions:

• The choice of polyol, diisocyanate, and chain extender significantly influences SPU characteristics.
• The study provides a comprehensive understanding of structure-morphology relationships in these novel SPUs.
• These findings contribute to the rational design of SPUs with tailored properties for specific applications.