超支化聚氨酯热熔胶的合成及性能  

Synthesis and Properties of Hyperbranched Polyurethane Hot Melt Adhesives

作　　者：曾少敏[1] 刘丹[1] 陈爱芳[1] 姚畅[1] 郭小丽[1] 徐祖顺[1] 

机构地区：[1]湖北大学材料科学与工程学院,武汉430062

出　　处：《应用化学》2009年第2期159-162,共4页Chinese Journal of Applied Chemistry

基　　金：湖北省杰出人才基金资助项目(2004ABB003)

摘　　要：采用AA′+bB2法制备了可以直接作为热熔胶使用的超支化聚氨酯(HPU)。以甲苯-2,4-二异氰酸酯(TDI)与聚碳酸酯二醇(PCDL)为原料合成两端为异氰酸根(NCO)封端的低聚物(A2),然后在0℃下加入二乙醇胺(DEOA)得AB2型中间物,进一步高温聚合得支化点间含有长链段的超支化聚氨酯。采用红外光谱(FTIR)、核磁共振(13C NMR)、GPC对超支化聚氨酯的结构进行了表征。结果表明,所得到的产物具有超支化结构,在55℃下反应20 h后,支化度可达到0.75,重均分子量Mw=7.0×103。对产物进行了热失重和粘接性能测试。结果表明,超支化聚氨酯的热分解温度为200℃。产物的粘接剪切强度随着链段长度的增加先增大后减小,最大可达到6.5 MPa。Hyperbranched polyurethane was successfully synthesized by AA′ ＋ bB2 approach and it could be used as hot melt adhesives. Excessive 2,4-toluylene diisocyanate （TDI） was used to react with polycarbona, tediols（PCDL） to obtain isocyanate end-capped oligomeric A2. Then the bB2 monomer, diethanolamine （DEOA） was added at 0 ℃ to form the AB2 intermediate. Further self-condensation of this AB2 intermediate led to hyperbranched polyurethane （HPU） with long chains between the branching points at a higher temperature. The structure of the product was characterized by FTIR, ^13C NMR and GPC. The results show that the degree of branching（DB） of the polymer was up to 0.75 when the reaction was conducted at 55 ℃ for 20 h, and the weight-average molecular mass （ Mw ） was 7.0 × 10^3. The thermogravimetric analysis （ TGA ） and tensile test were also conducted. The degradation temperature of the product was up to 200 ℃. The adhesive shear strength of the product increased with increasing the length of the aliphatic chains, with the highest value of 6.5 MPa.

关 键 词：超支化聚氨酯 合成 热熔胶 

分 类 号：O631.5[理学—高分子化学]