摘要
以甲苯-2,4二异氰酸酯(TDI)和三羟甲基丙烷(TMP)为单体,采用反应官能团异单体法合成第3到6代超支化聚氨酯(HBPU),对提纯后的产物进行红外光谱、X射线衍射和差示扫描量热分析,并研究了硬脂酸改性HB-PU(HBPU-SA)对线形PU力学性能的影响。结果表明,TDI中的异氰酸酯基(—NCO)反应完全,得到的HBPU的结晶性差,第3代到第6代HBPU晶格的层间距分别为0.41、0.46、0.475、0.414 nm;随着HBPU代数的增加,其玻璃化转变温度逐渐由第3代的117.29℃降低至第6代的69.14℃;HBPU-SA含量为15%(质量分数,下同)时,线形PU/HBPU-SA共混物的拉伸强度和断裂伸长率比纯线形PU分别提高了4.1和4.2倍。
Hyperbranched polyurethanes （HBPU） from the third generation to the sixth generation were synthesized from 2,4-diisocyanatotoluene （TDI） and trimethylolpropane. The products were characterized using Fourier transform infrared spectroscopy （FTIR）, XRD, and differential scanning calorimetry（DSC）. It was found that --NCO of TDI was reacted completely. The dspacings from the third generation to the sixth generation were 0. 41,0. 46, 0. 475,0. 414 nm, respectively. With the increasing generation, the glass transition temperature （Tg） decreased from 117. 29 ~C of the third generation to 69. 14 ℃ of the sixth generation regularly. Blending 15 wt % of stearic acid modified HBPU（HUPU-SA） with linear PU, the tensile strength and enlongation at break of the blend increased 4. 1 and 4. 2 times, respectively.
出处
《中国塑料》
CAS
CSCD
北大核心
2010年第11期31-34,共4页
China Plastics
关键词
超支化聚氨酯
甲苯-2
4二异氰酸酯
三羟甲基丙烷
合成
表征
hyperbranched polyurethane
2,4-diisocyanatotoluene
trimethylolpropane
synthesis
characterization
