Polyester polyols for waterborne polyurethanes and hybrid dispersions

Athawale, Vilas D.; Kulkarni, Mona A.

doi:10.1016/j.porgcoat.2009.09.015

Cited by 45 publications

(24 citation statements)

References 10 publications

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“…Polyurethanes are also widely used in coatings with various chemistries tailoring curing behaviors. They are used as 2 K solventborne coatings having a hardener derived from diisocyanate precursors, [16] 1 K systems having blocked isocyanates as a crosslinker, [17] moisture curable coatings, [17,18] and water-based polyurethane dispersions [19] (PUDs).…”

Section: Polyurethanesmentioning

confidence: 99%

Stimuli‐Responsive Polyurethane Dispersions – Aqueous Auto‐Dispersion

Gupta

Texter

2018

Israel Journal of Chemistry

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We report a single-pot synthesis of polyurethanes (PUs) in solvent that utilizes an hydroxyl imidazolium bromide salt (ionic liquid) as a chain terminating group. This material, after being desolvated under activation, spontaneously disperses in water to form auto-dispersing polyurethane dispersions (PUDs). These PUDs comprise aggregates, that separate under further activation (sonication) to form sub-micron to sub-100-nm dispersions that are stable. Their size changes during such (auto) dispersion processing are examined by dynamic light scattering. Anion-dependent stimuli-responsiveness is observed upon anion exchange. This stimuli-responsiveness is based on imidazolium-anion pair solubility changes induced by anion exchange. Dispersion destabilization can be induced by selection and anion exchange for particular "hydrophobic" anions. Film formation and wetting are observed to exhibit stimuli-responsiveness to anion exchange. Coatings based on PUD comprising tripropylene glycol are less hydrophilic than coatings incorporating PEO-based PUDs.

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Section: Polyurethanesmentioning

confidence: 99%

Stimuli‐Responsive Polyurethane Dispersions – Aqueous Auto‐Dispersion

Gupta

Texter

2018

Israel Journal of Chemistry

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“…물에 분산된 폴리우레탄은 저장되는 조건에서 가해지는 열역학적 에너지의 차이에 따라 분산 상태는 달라질 수 있다. [18] 상온에서 30 일 동안 4 h 간격으로 폴리우레탄 입자들의 변화를 분석하여 Figure 3에 나타내었다. Figure 3 ( 시간에 따른 분산안정성의 변화로 인한 각각의 데이터간의 면적을 적분하여 누적시킨 TSI (Turbiscan stability index) 값으로 PUD-A2, PUD-B2, PUD-C2의 분산 안정성을 Figure 4에 나타내었다.…”

Section: 분산 안정성unclassified

“…Figure 4를 보면 PUD-B2, PUD-C2가 PUD-A2 보다 분산된 상의 destabilization ki-netics가 초반에 급격하게 변하였기 때문에 TSI 값이 증가하였고, 상대 적으로 이른 시간에 분산안정성이 나빠짐을 예측하였다. 그렇지만 전 반적으로 모든 PUD가 오랜 시간이 지났음에도 불구하고 TSI 값이 10 이하로 낮게나와 입자가 분산이 안정된 상태인 것으로 판단된다 [18].…”

Section: 분산 안정성unclassified

Modification of Water-borne Polyurethane Using Benzophenone Crosslinker

Kim¹,

Kim²,

Chang³

et al. 2016

Applied Chemistry for Engineering

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Production of eco-friendly and biologically harmless materials is strongly required in all industries. In particular, reducing volatile organic compounds in coating processes is extremely important to secure worker's safety. During recent two decades, extensive research works on water-borne polyurethane dispersion (PUD) have been continuously developed as an alternative to solvent-borne polyurethane. However, PUD was shown inferior mechanical properties to the organic solvent-borne polyurethane due to a limit to the molecular weight increase, which resulted in the limit of applications. To overcome this drawback, several approaches have been examined such as polymer blends and thermal/radiation induced crosslinking. Among these methods, the radiation curing system was suitable for industrialization because of the high crosslinking density and fast curing speed. In this study, we overcame the drawback for PUD via introducing benzophenone radiation curable units to PUD. We synthesized PUD films which possessed good dispersion in water for 30 days, increased Tg and Td more than 5 ℃ after UV curing film as well as improved young's modulus more than double.

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“…PUD (synthesized from glycolized oligoester PET/PG (1:2), Fig. 4b) synthesized from depolymerised oligoesters with lower molar ratio of PET repeating unit to glycol in glycolysis reaction showed lower thermal stability in the initial stage of degradation may be due to the presence of greater amount of aromaticity in polyester backbone which makes the PU chains susceptible to scission and relieves the structure crowing (Athawale & Kulkarni, 2010). In later stage (above 300 o C), it showed enhanced thermal stability.…”

Section: Synthesis Of Pud Based On Glycolyzed Products With Molar Ratmentioning

confidence: 99%