Blends of fatty-acid-modified dendrimers with polyolefins

✍ Scribed by Barry J. Bauer; Aissa Ramzi; Da-Wei Liu; Rolf L. Scherrenberg; Peter Froehling; Jacques Joosten

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 164 KB
• Volume: 38
• Category: Article
• ISSN: 0887-6266
• DOI: 10.1002/(sici)1099-0488(20000101)38:1<95::aid-polb12>3.0.co;2-5

✦ Synopsis

Blends were made by solution and melt-mixing fatty-acid-modified dendrimers with various polyolefins. Small-angle neutron scattering (SANS) was used to determine the miscibility of the blends. Poly(propylene imine) (PPI) dendrimers G1, G3, and G5 [DAB-dendr-(NH 2 ) y ] with y ϭ 4, 16, and 64, were reacted with stearic acid or stearic acid-d 35 forming amide bonds. The modified dendrimers were then blended with high-density polyethylene (HDPE), high-density polyethylene-d 4 (HDPE-d 4 ), low-density polyethylene (LDPE), amorphous polypropylene (PP), or an ethylene-butylene copolymer (E-co-B). Limiting power law behavior shows that all of the blends are immiscible. It is likely that the dendrimers form a second phase, being finely dispersed, but thermodynamically immiscible.