聚苯并咪唑和甲基二苯乙炔基硅烷的改性研究

聚苯并咪唑和甲基二苯乙炔基硅烷的改性研究

张宜荣褚荣廖浩宇倪礼忠

材料科学与工程学院，华东理工大学，上海，200237

.

3

5

temperature/?

Fig.3 TGA curves of PBI:MDPES=0:1

从TGA曲线得到的树脂的耐热性能指标见表1.

Table 1 heat-resistance performance of PBI：MDPES

PBI：MDPES Td5/℃ in air 800℃ mass residual ratio（%）in nitrogen

1:1 675.3 88.6

1:0 617.6 80.1

0:1 535.4 87.1

为675.3℃，这个数值与表1数据表明改性后的固化树脂耐热性能优异，Td

5

为567℃）高出许多，而且比PBI，MDPES

聚酰亚胺PI(Kapton杜邦)相比（PI的Td

5

分别固化的耐热性要好；

Table 2 water absorption of PBI:MDPES

PBI：MDPES Water absorption(%) for 24 hours

1:1 2.4

1:0 4.4

0:1 2.3 表2为不同PBI和MDPES配比对树脂吸水率的影响表。表2数据表明改性后

的固化树脂大大改进了PBI容易吸水的缺点，吸水率比PBI低将近一半，而且还

比MDPES单独固化的吸水率略低。

综上所述，PBI和MPDPES通过共混改性后，树脂的耐热性能优异，耐水性能

得到改善。

参考文献

1 H.V ogel,C.S.Marvel,J.Polymer Sci.,1961,2,511

2辛松民，王一璐，有机硅合成工艺及产品应用，北京：化学工业出版社，2000，

20

The investigation of Polybenzimidazole and

Methyldiphenynylenesilane modification

Yirong Zhang,Rong Chu,Haoyu Liao,Lizhong Ni

School of material science and engineering, East China University of Science and

Technology, Shanghai, 200237

Key words: Polybenzimidazole(PBI),Methyldiphenynylenesilane ,modification

Polybenzimidazole(PBI) is a kind of polymers which contain benzimidazole rings and have remarkable heat-resistance property. PBI ,with its main chain configuration stable, has predominant heat-resistance property and excellent mechanical property. However, it is easy to absorb water , which restricts its application on composite materials. Methyldiphenynylenesilane(MDPES) resin has outstanding heat-resistance property, very good electrical and good water-resistance properties. However，its mechanical property is not good. So PBI and MDPES modified by each other, the heat-resistance and water-resistance properties will be improved.

Poly-2,2’-(m-phenylene)-5,5’-bibenzimidazole has been synthesized using 3,3’-diaminobenzidine(DAB) and dipheny isophthalate(DPIP) .and then modified by Methyldiphenynylenesilane. The results of study show that, the resin , modified by each other ,has better heat-resistance property when PBI/MDPES is 1:1 and the highest solidified temperature is 400℃.Its temperature of 5% weight loss (Td5) is 675.3℃,and its mass residual at 800℃ in nitrogen is 88.6%.At the same time, after modified, the water-resistance property of the resin has been improved largely. The water absorption(%) of the resin modified is less nearly as half as PBI.