Synthesis, structure and properties of poly(ether-urethane)s synthesized using a tri-functional oxypropylated glycerol as a polyol

Abstract

The main aim of this work was to obtain poly(ether-urethane)s using tri-functional polyoxyalkylene polyol (Rokopol G1000), which introducing the chemical cross-links into the structure of polyurethanes. Poly(etherurethane)s were prepared using two-step method, called prepolymer method, which involves in the first step the reaction of 4,4 0 -diphenylmethane diisocyanate (MDI) and tri-functional polypropylene glycol glycerol triether polyol. In the second step, prepolymer chains were extended by using: 1,6-hexanediol, 1,4-butanediol in the mixture with poly(ethylene glycol) and poly(ethylene glycol). The prepolymer chains extending was realized at three different molar ratios of NCO groups (presented in prepolymer) to OH groups (presented in chain extender), i.e., 0.95, 1.00 or 1.05. The influence of chain extender type on the chemical structure, selected mechanical properties and thermomechanical properties of the obtained poly(ether-urethane)s was investigated. The results showed that applying different types of chain extenders results in obtaining materials with diversified mechanical properties, but very similar thermal stability. The performance of obtained poly(etherurethane)s is mostly affected by the chemical cross-links, which were introduced into soft segments by tri-functional polyetherol.

Application of FTIR Method for the Assessment of Immobilization of Active Substances in the Matrix of Biomedical Materials

“…Similar assessments of polyurethane based-materials have been presented earlier [58,59]. Besides, the available publications [59,60] report that the band at 1702 cm −1 is assigned to the hydrogen-bonded C=O (hydrogen bonding between C=O and N-H) of urethane linkage, while the peak at about 1720 cm −1 is related to free C=O group.…”

Thermal analysis of polyurethane elastomers matrix with different chain extender contents for thermal conductive application

“…Table 3 shows the glass transition temperature of hard segment tends to increase with increasing chain extender content. This increase in melting point is may be due to the increase in the number of higher length hard segment chains in the hard segment domainŝ that occur as the hard segment content of the polymer is increased [20] and attributed to increasing hard segment crystallinity [28] and phase separation which tend to reduce soft segment mobility. The increasing hard segment resulted in larger hard microcrystalline domains that restricted the molecular motion of the soft segment [5].…”

Photochemical weathering of polyurethane microplastics produced complex and dynamic mixtures of dissolved organic chemicals

“…18,19 PU is a versatile polymer, as its properties can be easily tailored by changing the polyol and isocyanate precursors and by introducing crosslinks. 20,21 In 2015, PU ranked as the 7th most produced synthetic polymer with nearly 30 million metric tons fabricated. 22 One commercially important class of PUs are thermoplastic elastomers that are not cross-linked and alternate exible segments, based on long polyester or polyether polyols, and rigid segments, consisting of urethane groups, the reaction products of isocyanates, and hydroxyl functionalities, e.g., from polyols.…”