A novel phosphatidylcholine-modified polyisoprene: synthesis and characterization

作者：Chu, Hualei; Song, Yuanqing; Li, Jiehua^*; Luo, Feng; Tan, Hong^*; Huang, Guangsu; Fu, Qiang

来源：Colloid and Polymer Science, 2016, 294(2): 433-439.

DOI：10.1007/s00396-015-3798-y

• Polyisoprene
• Phosphatidylcholine
• Natural rubber
• Synthesis
• Characterization

Polyisoprene (PI) is the main component of natural rubber. To imitate natural rubber and understand the function of phospholipid in natural rubber, a novel phosphatidylcholine (PC)-modified polyisoprene (PI-pc) is synthesized using a PC and a commercial PI. The PI is firstly brominated by N-bromosuccinimide, and then, diethyl malonate is introduced as a branch chain of PI. In sequence, the PC is imported into the branch chain of PI via condensation of the activated ester terminals in diethyl malonate and the amino terminals in PC to obtain the desired product PI-pc. The bulk structure of the prepared PI-pc is carefully characterized with nuclear magnetic resonance spectra (H-1 and P-31 NMR), Fourier transform infrared spectroscopy (FT-IR), gel permeation chromatograph (GPC), and differential scanning calorimetry (DSC). The introduction of PC to the branch chain of PI increases the molecular weight and also the glass transition (T-g) of the PI. The increment of T(g)s and melting enthalpy for the PI-pcs from both solution and emulsion indicates that the attached PC is beneficial to the self-assembly of PI chains and thus promotes the crystallization. Our present work provides a new method for importing PC to PI to imitate natural rubber, and also, the results could be a footstone for us to explore the effect of phospholipid on the property of natural rubber.

• 出版日期2016-2
• 单位高分子材料工程国家重点实验室; 四川大学