聚丙烯接枝N,N-二烯丙基三聚氰胺的制备及表征

Preparation and Characterization of Polypropylene-g-N,N-Diallylmelamine

采用过氧化二异丙苯(DCP)作为引发剂,利用反应挤出方法成功制备了聚丙烯接枝N,N-二烯丙基三聚氰胺(PP-g-NDAM).氮元素分析及傅里叶变换红外光谱(FTIR)结果表明:N,N-二烯丙基三聚氰胺(NDAM)已成功接枝到聚丙烯(PP)分子链上.通过测定PP-g-NDAM的接枝率(GD)以及熔体流动指数(MFI),分析讨论DCP及NDAM用量对反应挤出体系的影响.在试验范围内,发现当m(PP):m(NDAM):m(DCP)=100:6:0.4时,PP-g-NDAM的接枝率相对较高,接枝效率最大.采用广角X射线衍射(WXRD)、差式扫描量热法(DSC)及热失重(TG)分析研究了PP及PP-g-NDAM的结晶及热性能,结果表明:相比PP,PP-g-NDAM的晶型及熔融温度未发生明显变化,而结晶温度和热稳定性有明显改善.

With dicumyl peroxide （DCP） as initiator, N, N- Diallylmelamine （NDAM） was successtulJy grafted onto the molecular chains of polypropylene （PP） by the reactive extrusion method. The nitrogen analysis and the Fourier transform infrared spectroscopy （FTIR） confirmed that grafting polymerization occurred during the reactive extrusion. Then the grafting degree （GD） and melt flow index （MFI） of the PP-g-NDAM samples were measured in order to analyse the effect of DCP and NDAM contentration on the reactive extrusion. The results showed that when m（PP） ： m（NDAM） ： m（DCP）=＇100 ： 6 ： 0.4, a relatively higher grafting degree and the highest grafting diffraction （WXRD）, differential scanning calorimetric effiency were reserved. The wide angle X-ray （DSC） and thermogravimetic （TG） analysis were used to measure the crystallization and thermal properties of PP and PP-g-NDAM. It indicated that the crystal formation and the melting temperatures of PP-g-NDAM took an unconspicuous changes compared with virgin PP. However, the crystllization temperatures and the thermal stable properties of PP-g-NDAM were obviously enhanced.