High performance polyurethane dispersion synthesized from plant oil renewable resources: A challenge in the green materials

In the present work, four types of anionic waterborne polyurethane dispersions (APUD) based on polytetramethylene ether glycol (PTMG) and two aliphatic diisocyanates, dicyclohexylmethane diisocyanate (HMDI) or isophorone diisocyanate (IPDI), were prepared by polymerization methods which for the first time controlled the location (soft or hard segment) of hydroxylated tung oil (HTO) incorporation into the final APUD. The resulting HTO‐containing APUD polymers (HTO‐APUDs) with postpolymerization crosslinking capability were characterized using FTIR, DMA, AFM and water imbibition methods, and compared to model compounds synthesized to have the same parts of chemical structural linkages for band assignment. A common PUD sample, as well as polypropylene oxide (PPG) with molecular weight similar to HTO (Mn = 400), was used to replace it for preparing control samples to highlight the role of long branched chains and conjugated double bonds in HTO. Based on the analysis of multiple H‐bond interactions, the relationship of HTO location in the APUD polymer structure to the soft/hard segment compatibility and the diisocyanate structure was further studied. This work is expected to provide basic data for properties regulation in practical applications by adjusting the chain and phase structure, as well as the intermolecular interactions, in these APUDs.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and molecular interaction of tung oil‐based anionic waterborne polyurethane dispersion

Jiang

Ren

Liu

et al. 2020

“…9 Vegetable oils and some other biomass materials have been widely reported in synthetic materials for PU materials. [10][11][12][13][14][15][16] PUs obtained from biomass-derived polyols are a promising alternative to other petrochemical products. 1,2,4,17 Among them, vegetable oils, as biorenewable raw materials for PU manufacturing and the polymer industry, have become highly desirable for economic and environmental reasons.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of polymeric dyes based on self‐colored network of castor oil‐based waterborne polyurethane

Zeng

Yin

et al. 2020

The development of vegetable oil‐based polymers was particularly suitable for the era of increasingly scarce petroleum. Self‐colored castor oil‐based waterborne polyurethanes (PUs) were successfully synthesized based on castor oil and 1‐amino‐4‐hydroxy‐2‐(6‐hydroxyhexyl) anthraquinone (DR) as polyols. The UV–Vis spectrum showed that the addition of carboxylic acid groups make the spectrum of the PU produce the hyperchromic effect under alkaline conditions. Castor oil‐based waterborne colored PUs possessed excellent stability under weak alkaline conditions. The connection of castor oil caused the PU to constitute soft polymer networks. PU coatings on cotton fabrics possessed excellent color properties. The urethane groups in the PUs formed hydrogen bonds with the hydroxyl groups on the cotton fibers and the polymer network structure formed by the PU coating itself made the color fastness of the cotton coatings reached grade 5. With the increase of castor oil content, the degradation rate of castor oil‐based waterborne colored PU increased from 3.45% to 3.65%. This work provides a way to impart excellent color properties and fastness to PU coatings by inserting dye molecules and vegetable oils into the PU macromolecular chain.

“…Polyurethane elastomer (PUE) is a polymer made from polyisocyanate, polyether, or polyester polyol, and chain extender or crosslinking agent through stepwise addition polymerization . PUE has good physical and mechanical properties, such as high modulus and high tensile strength, and is widely used in construction, medicine, biological materials, and other fields .…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect between zeolitic imidazolate framework‐8 and expandable graphite to improve the flame retardancy and smoke suppression of polyurethane elastomer

Wang

Chen

et al. 2019

Zeolitic imidazolate framework-8 (ZIF-8) was synthesized at room temperature, and then added with expandable graphite (EG) to polyurethane elastomer (PUE) to study their flame retardancy and smoke suppression of PUE. The results showed that when the total flame retardant was 3 wt % and the ratio of ZIF-8 and EG was 1:3, it had the best effect on the flame retardancy and smoke suppression of PUE. Compared with pure PUE, the peak heat release rate, the total heat release, and the maximum smoke density values of Z1E3 decreased by 83.4, 42.6, and 22.4%, respectively. Moreover, the limited oxygen index value of Z1E3 increased to 30.2% and its UL-94 vertical burning test reached V-1 rating. This was because ZIF-8 synergized with EG to make the intumescent char layer compact, resulting in improved flame retardancy and smoke suppression of PUE. The specific mechanism of flame retardancy and smoke suppression is also discussed in this article.