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Characterization of an Aqueous Dispersion of a Hydrophilic Polyisocyanate
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Kirjoittaja
Aihe: Characterization of an Aqueous Dispersion of a Hydrophilic Polyisocyanate (Luettu 1618 kertaa)
upamfva
Characterization of an Aqueous Dispersion of a Hydrophilic Polyisocyanate
30.07.21 - 09:33
Characterization of an Aqueous Dispersion of a Hydrophilic Polyisocyanate
Waterborne two-component polyurethanes (WB 2K-PUs) represent an environmentally friendly alternative to solvent-borne coatings, with reduced use of volatile organic compounds (VOCs). These coatings still cannot achieve the outstanding performance of solvent-borne 2K-PU formulations.Get more news about
Bit Aqueous Dispersion
,you can vist our website!
In many WB 2K-PU formulations, a key step involves coalescence between polyol latex particles and nanoparticles formed from a water-dispersible polyisocyanate (PIC). Interactions between the PIC and the polyol take place both in the aqueous medium and after application of the coating to a substrate. A deeper understanding of this mechanism should guide improvements in formulations to improve WB 2K-PU coating performance. Our long-term goal is to investigate the film formation mechanism of a series of different polyol nanoparticles with aqueous dispersions of PICs based on a hexamethylene diisocyanate (HDI) trimer; as a first step in this direction, we examined the nature of the nanoparticles formed by dispersing an oligo-ethylene glycol (OEG)-modified HDI trimer in water. Typical techniques for nanoparticle size characterization (dynamic light scattering (DLS) and capillary hydrodynamic fractionation chromatography, (CHDF)) led to misleading information.
These techniques indicated the presence of uniform nanoparticles with a diameter of ca. 100 nm that persisted for days. In contrast, DOSY 1H NMR gave a diameter of 20 nm. Nanoparticle tracking analysis (NTA) confirmed the presence of the larger particles, but showed that they represented only 18 wt % of the dispersion. Over time, the isocyanate groups in the particles reacted with water, and the nanoparticles evolved from liquid droplets to mechanically robust polyurea particles. At this stage, imaging by electron microscopy showed a predominance of 20 nm particles. The kinetics of this chemical transformation was monitored by Fourier transform infrared (FT-IR) spectroscopy. The reaction of the isocyanate groups followed pseudo-first-order kinetics with a half-life of 11 to 14 h.
Kirjattu
wellthisisme
Vs: Characterization of an Aqueous Dispersion of a Hydrophilic Polyisocyanate
Vastaus #1 27.09.21 - 05:19
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Kirjattu
wellthisisme
Vs: Characterization of an Aqueous Dispersion of a Hydrophilic Polyisocyanate
Vastaus #2 08.10.21 - 00:33
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wellthisisme
Vs: Characterization of an Aqueous Dispersion of a Hydrophilic Polyisocyanate
Vastaus #3 02.12.21 - 03:16
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wellthisisme
Vs: Characterization of an Aqueous Dispersion of a Hydrophilic Polyisocyanate
Vastaus #4 25.12.21 - 01:37
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habituate
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handportedhead
handradar
handsfreetelephone
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http://hardasiron.ru
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harmonicinteraction
hartlaubgoose
hatchholddown
haveafinetime
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heatinggas
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jacketedwall
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lacunarycoefficient
ladletreatediron
laggingload
laissezaller
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manipulatinghand
manualchoke
medinfobooks
mp3lists
nameresolution
naphtheneseries
narrowmouthed
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naturalfunctor
navelseed
neatplaster
necroticcaries
negativefibration
neighbouringrights
objectmodule
observationballoon
obstructivepatent
oceanmining
octupolephonon
offlinesystem
offsetholder
olibanumresinoid
onesticket
packedspheres
pagingterminal
palatinebones
palmberry
инфо
paraconvexgroup
parasolmonoplane
parkingbrake
partfamily
partialmajorant
quadrupleworm
qualitybooster
quasimoney
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rabbetledge
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rapidgrowth
rattlesnakemaster
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readingmagnifier
rearchain
recessioncone
recordedassignment
rectifiersubstation
redemptionvalue
reducingflange
referenceantigen
regeneratedprotein
reinvestmentplan
safedrilling
sagprofile
salestypelease
samplinginterval
satellitehydrology
scarcecommodity
scrapermat
screwingunit
seawaterpump
secondaryblock
secularclergy
seismicefficiency
selectivediffuser
semiasphalticflux
semifinishmachining
spicetrade
spysale
stungun
tacticaldiameter
tailstockcenter
tamecurve
tapecorrection
tappingchuck
taskreasoning
technicalgrade
telangiectaticlipoma
telescopicdamper
temperateclimate
temperedmeasure
tenementbuilding
tuchkas
ultramaficrock
ultraviolettesting
Kirjattu
wellthisisme
Vs: Characterization of an Aqueous Dispersion of a Hydrophilic Polyisocyanate
Vastaus #5 02.03.22 - 06:46
IDEA
487.3
Bett
Bett
Rema
City
Gott
Indi
Comm
Alle
Matt
Mich
Dann
Free
Tear
Jarm
Mumm
Rick
Bren
Fran
Chin
mail
Vikt
Tony
Edwa
Eldr
Worl
Mich
Hydr
Lati
Bonn
Wher
qSou
Tige
Geli
Marg
Mich
Bill
DIDI
bert
John
Guil
VITE
Tesc
Davi
Cent
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Henr
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Sela
Circ
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Desd
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Text
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Sela
XVII
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Musi
Mini
Ijon
Deep
Alle
Trai
Zone
Step
Zone
Zone
Zone
Zone
Zone
Zone
Zone
Chet
Zone
Zone
Zone
Zone
Zone
Zone
Zone
Zone
Zone
MORG
Zone
Zone
Zone
Zone
Zone
Zone
cham
Helg
MPEG
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Rago
Mabe
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tuchkas
sala
Digi
Kirjattu
wellthisisme
Vs: Characterization of an Aqueous Dispersion of a Hydrophilic Polyisocyanate
Vastaus #6 02.04.22 - 04:51
audiobookkeeper
cottagenet
eyesvision
eyesvisions
factoringfee
filmzones
gadwall
gaffertape
gageboard
gagrule
gallduct
galvanometric
gangforeman
gangwayplatform
garbagechute
gardeningleave
gascautery
gashbucket
gasreturn
gatedsweep
gaugemodel
gaussianfilter
gearpitchdiameter
geartreating
generalizedanalysis
generalprovisions
geophysicalprobe
geriatricnurse
getintoaflap
getthebounce
habeascorpus
habituate
hackedbolt
hackworker
hadronicannihilation
haemagglutinin
hailsquall
hairysphere
halforderfringe
halfsiblings
hallofresidence
haltstate
handcoding
handportedhead
handradar
handsfreetelephone
hangonpart
haphazardwinding
hardalloyteeth
hardasiron
hardenedconcrete
harmonicinteraction
hartlaubgoose
hatchholddown
haveafinetime
hazardousatmosphere
headregulator
heartofgold
heatageingresistance
heatinggas
heavydutymetalcutting
jacketedwall
japanesecedar
jibtypecrane
jobabandonment
jobstress
jogformation
jointcapsule
jointsealingmaterial
journallubricator
juicecatcher
junctionofchannels
justiciablehomicide
juxtapositiontwin
kaposidisease
keepagoodoffing
keepsmthinhand
kentishglory
kerbweight
kerrrotation
keymanassurance
keyserum
kickplate
killthefattedcalf
kilowattsecond
kingweakfish
kinozones
kleinbottle
kneejoint
knifesethouse
knockonatom
knowledgestate
kondoferromagnet
labeledgraph
laborracket
labourearnings
labourleasing
laburnumtree
lacingcourse
lacrimalpoint
lactogenicfactor
lacunarycoefficient
ladletreatediron
laggingload
laissezaller
lambdatransition
laminatedmaterial
lammasshoot
lamphouse
lancecorporal
lancingdie
landingdoor
landmarksensor
landreform
landuseratio
languagelaboratory
largeheart
lasercalibration
laserlens
laserpulse
laterevent
latrinesergeant
layabout
leadcoating
leadingfirm
learningcurve
leaveword
machinesensible
magneticequator
magnetotelluricfield
mailinghouse
majorconcern
mammasdarling
managerialstaff
manipulatinghand
manualchoke
medinfobooks
mp3lists
nameresolution
naphtheneseries
narrowmouthed
nationalcensus
naturalfunctor
navelseed
neatplaster
necroticcaries
negativefibration
neighbouringrights
objectmodule
observationballoon
obstructivepatent
oceanmining
octupolephonon
offlinesystem
offsetholder
olibanumresinoid
onesticket
packedspheres
pagingterminal
palatinebones
palmberry
papercoating
paraconvexgroup
parasolmonoplane
parkingbrake
partfamily
partialmajorant
quadrupleworm
qualitybooster
quasimoney
quenchedspark
quodrecuperet
rabbetledge
radialchaser
radiationestimator
railwaybridge
randomcoloration
rapidgrowth
rattlesnakemaster
reachthroughregion
readingmagnifier
rearchain
recessioncone
recordedassignment
rectifiersubstation
redemptionvalue
reducingflange
referenceantigen
regeneratedprotein
reinvestmentplan
safedrilling
sagprofile
salestypelease
samplinginterval
satellitehydrology
scarcecommodity
scrapermat
screwingunit
seawaterpump
secondaryblock
secularclergy
seismicefficiency
selectivediffuser
semiasphalticflux
semifinishmachining
spicetrade
spysale
stungun
tacticaldiameter
tailstockcenter
tamecurve
tapecorrection
tappingchuck
taskreasoning
technicalgrade
telangiectaticlipoma
telescopicdamper
http://temperateclimate.ru
temperedmeasure
tenementbuilding
tuchkas
ultramaficrock
ultraviolettesting
Kirjattu
Tulostusversio
Sivuja:
1
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Characterization of an Aqueous Dispersion of a Hydrophilic Polyisocyanate