馬來酸酐苯乙烯熔融接枝聚烯烴彈性體的研究

1、馬來酸酐/苯乙烯熔融接枝聚烯烴彈性體的研究陳曉浪1,2，陳博鑫1，于杰2，郭少云1,*，羅筑2（1.高分子材料工程國家重點實驗室，四川大學(xué)高分子研究所，四川 成都 610065；2.貴州省材料技術(shù)創(chuàng)新基地，貴州 貴陽 550014）DOW化學(xué)公司研發(fā)的乙烯-辛烯共聚物是一種新型聚烯烴彈性體(POE)，具有較窄相對分子質(zhì)量分布、共聚單體分布均勻和結(jié)構(gòu)可控。POE有優(yōu)異的耐紫外光性、流變性和良好的力學(xué)性能；而且與聚烯烴親和性好、低溫韌性好等優(yōu)點，廣泛地用于聚烯烴的改性。但是POE的非極性限制了其進一步應(yīng)用。對POE進行官能團化,可提高其與極性聚合物的界面親和性,極大地拓寬了POE的應(yīng)用領(lǐng)域。常用于

2、POE的接枝單體有馬來酸酐（MAH）、丙烯酸（AA）和硅烷等1，然而其接枝效率較低。資料顯示苯乙烯（St）的加入能顯著提高MAH對聚合物合物基體的接枝率，同時可抑制其降解2。本文采用熔融反應(yīng)接枝的方法在雙螺桿擠出機中制備了MAH-St接枝POE共聚物，并對其結(jié)構(gòu)與性能進行了表征。從圖1的FTIR光譜表明，在引發(fā)劑作用下MAH被成功接枝到POE，同時St的加入在1024cm-1的吸收峰得到加強，在673cm-1出現(xiàn)新的吸收峰，暗示St提高了MAH對POE的接枝率。圖2為單體含量變化的接枝物的FTIR譜圖，表明在引發(fā)劑固定情況下，接枝率依賴于單體的含量。MFI測試結(jié)果（圖3）表明：在DCP固定前提

3、下，MFI隨MAH-St含量的增加而降低，證明接枝物中發(fā)生了交聯(lián)，降低了分子鏈的可流動性。從TGA分析（圖4）看出，接枝后POE的熱穩(wěn)定性得到了明顯的改善，降解溫度提高。MAH-St含量的改變對其熱穩(wěn)定性的影響不大。Fig. 1 FTIR spectra of: (A) POE; (B) POE-g-MAH obtained from PP/MAH/DCP (96/4/0.2); (C) POE-g-(MAH-St) obtained from the POE/MAH/St/DCP (96/2/2/0.2)Fig. 2 FTIR spectra of MHA-St grafted POE (0

4、.2phr DCP, MAH/St=1/1) with variousamounts of MAH-St: (A) Neat-POE; (B) 2wt%; (C) 4wt%; (D) 6wt%; (E) 8wt%Fig.3 Effect of MAH-St content on melt flow index (MAH/St=1/1, DCP 0.2phr)Fig. 4 TGA curves of MAH-St grafted POE (0.2phr DCP, MAH/St=1/1) with variousamounts of MAH-St: (A) Neat-POE; (B) 2wt%;

5、(C) 4wt%; (D) 6wt%; (E) 8wt%參考文獻1 Liu N C, Yao G P, Huang H. Influences of grafting formulations and processing conditions on properties of silane grafted moisture crosslinked polypropylenes. Polymer, 2000, 41: 45372 Li Y, Xie X M, Guo B H. Study on styrene-assisted melt free-radical grafting of mal

6、eic anhydride onto polypropylene. Polymer, 2001, 42: 3419致謝 國家863計劃項目（2003AA32X230）資助和和國家重點基礎(chǔ)研究發(fā)展規(guī)劃項目（2005CB623800）資助A study on styrene-assisted melt grafting ofmaleic anhydride onto ethylene-octene copolymerChen Xiaolang1,2, Chen Boxin1, Jie Yu2, Guo Shaoyun1,*, Luo Zhu2(1.The State Key Lab of Poly

7、mer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu 610065, China; 2.Materials Eng and Tech Innovation Center of Guizhou, Guiyang 550014, China)Abstract: Free-radical melt grafting of the multi-monomer system of maleic anhydride (MAH)/styrene (St) onto ethylene-octen

8、e copolymer (POE) was studied using a twin-screw extruder. The effects of St and MAH-St concentrations on the grafting reaction were investigated. The grafted POE was characterized by FTIR, melt flow index (MFI) and TGA. It was shown that the addition of St to the melt grafting system as comonomer significantly enhanced MAH grafting degree onto POE. When DCP concentration was fixed, MAH-St content had a great effect on grafting degree of POE. MFI data of grafted POE showed that the MFI value was affected by MAH-St concentration. Moreover, TGA curves show