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Citation: LIU Dan, ZENG Shao-Min, YAO Chang, CHEN Ai-Fang, XU Zu-Shun. Synthesis and Properties of Hyperbranched Aqueous Polyurethane Based on Polycarbonatediol[J]. Chinese Journal of Applied Chemistry, ;2009, 26(9): 1031-1035. shu

Synthesis and Properties of Hyperbranched Aqueous Polyurethane Based on Polycarbonatediol

LIU Dan ^a ,
ZENG Shao-Min ^a ,
YAO Chang ^a ,
CHEN Ai-Fang ^a ,
XU Zu-Shun ^a,b,,

1.
a College of Materials Science and Engineering, Hubei University, Wuhan 430062;
2.
b Ministry-of-Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan 430062

Corresponding author: XU Zu-Shun,
Received Date: 27 August 2008
Available Online: 13 October 2008
Fund Project: 湖北省杰出人才基金资助项目(2004ABB003) (2004ABB003)

Hyperbranched aqueous polyurethane(HBAPU) was synthesized via A₂+bB₂ approach with 2,4-toluylene diisocyanate(TDI),polycarbonatediol(PCDL),dimethylol propionic acid(DMPA) and diethanol amine(DEOA) as materials.The structures of products were characterized by FT-IR and ¹³C NMR.The results show that the degree of the branching(DB) of HBAPU increased with increasing the molar ratio of n(NCO)/n(OH).The properties of the products were measured by photon correlation spectroscopy(PCS),TG,and tensile tests.The water-resistant ability of the cast films were also investigated.The distribution of the particle sizes of HBAPU varied from 15 nm to 65 nm.The partical size of HBAPU was only 20.6 nm when the content of DMPA was 0.4 mmol/g,while it was 130.9 nm for linear aqueous polyurethane at the sance conditions.Meanwhile,the HBAPU exhibited a good heat resistance,the degradation temperature of the product was up to 200 ℃,the lap shear strength increased with increasing the molar ratio of n(NCO)/n(OH),but it decreased when it reached to 33 MPa.The films showed a good water-resistance ability,the maximum water-swell(%) value was 4.3% even if the films were emerged in water for 24 h.
- hyperbranched,
- aqueous polyurethane,
- synthesis,
- properties
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