CAO Gaohua, XIA Zhengbin, ZHANG Yanhong, et al. Effects of AAS/DMPA on crystallinity of films of waterborne polyurethane[J]. CIESC Journal, 2013, (7): 2672-2678.
CAO Gaohua, XIA Zhengbin, ZHANG Yanhong, et al. Effects of AAS/DMPA on crystallinity of films of waterborne polyurethane[J]. CIESC Journal, 2013, (7): 2672-2678.DOI: 10.3969/j.issn.0438-1157.2013.07.049.
Waterborne polyurethane (WPU)with 50% solid content were synthesized by using polyethylene glycol adipate diol (PBA)
isophorone diisocyanate (IPDI)and hexamethylene diisocyanate (HDI)as main raw materials
N-(2-aminoethyl)-amino ethane sulphonated sodium (AAS)and dimethylol propionic acid (DMPA)as hydrophilic chain extender.The effects of AAS/DMPA molar ratio on crystallinity of WPU film were investigated by means of DSC
XRD and light transmittance measurement
and in turn the influence of crystallinity on water resistance and heat resistance was also studied by experiments of water absorption and thermal stability of WPU films.The results showed that with the increase of AAS/DMPA
relative crystallinity of the WPU films was enhanced.Consequently
to some degree
water resistance and heat resistance of WPU films were improved.