Framed aromatic polyurethanes based on an anionic macroinitiator, 4,4'-diphenylmethane diisocyanate, and 4,4'-dihydroxy-2,2-diphenylpropane: Synthesis and characterization

Davletbaeva, I. M.; Zaripov, I. I.; Karimullin, R. R.; Gumerov, A. M.; Davletbaev, R. S.; Шарифуллин, Р. Р.; Parfenov, V. V.

doi:10.1134/s1560090417010043

Cited by 2 publications

(1 citation statement)

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“…It was found by Yao Xiao et al [10] that MDI-50-based waterborne polyurethane showed better properties compared to IPDI based waterborne polyurethane. Davletbaeva, I. M. found that segmented polyurethanes with the predetermined length of the rigid block were formed in the case of 4,4′-MDI, while the use of polyisocyanate gave rise to framed aromatic polyurethanes [15]. Though there were many kinds of the PU curing agents, TDI and its derivatives were the most popular.…”

Section: Introductionmentioning

confidence: 99%

Preparation of branched polyurethane curing agent by condensation polymerization and radical polymerization

Wang

2020

SN Appl. Sci.

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A new PU curing agent with branched structure was prepared by esterification, radical polymerization and reaction of TDI. Unsaturated content (itaconic acid) was added in esterification of adipic acid and 1,4-butanediol, which prepared linear molecule poly (itaconic acid-adipic acid-1,4-butanediol). Then, azodiisobutyronitrile was used to initiate polymerization to form branched molecule (CPBIA). CPBIA reacted with semi-blocked TDI to prepare TDI-CPBIA. These polymers were characterized by FT-IR, 1 H NRM and GPC. Their structure was confirmed. The adjustment of polycondensation and radical polymerization by the raw material ratio and reaction temperature could yield the desired PU curing agent with branched structure and fine solubility. According primary experiments, TDI-CPBIA had fine application performance. The coating had good hardness (6H), thermal performance (T 0 > 250 °C), adhesion (level 1) and impact strength (> 50 cm). This PU curing agent has fine application performance.

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Section: Introductionmentioning

confidence: 99%