Citation: Shi-tong Ren, Xin Yang, Xiao-juan Zhao, Ying Zhang, Wei Huang. Liquid Polysulfide Rubber Toughening Bisphenol A-Aniline Based Polybenzoxazine[J]. Acta Polymerica Sinica, ;2016, (4): 494-502. doi: 10.11777/j.issn1000-3304.2016.15247 shu

Liquid Polysulfide Rubber Toughening Bisphenol A-Aniline Based Polybenzoxazine

Shi-tong Ren ^1,2,3 ,
Xin Yang ⁴ ,
Xiao-juan Zhao ⁴ ,
Ying Zhang ⁴ ,
Wei Huang ⁴

1.
1. Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190
2.
2. University of Chinese Academy of Sciences, Beijing 100049
3.
4.
Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190

Received Date: 11 September 2015
Revised Date: 16 November 2015

Liquid polysulfide rubber (LP-3) was used as a toughening modifier to improve the toughness of polybenzoxazine obtained from bisphenol A-aniline based benzoxazine (B-a).The mixing and curing processes of B-a and LP-3 were monitored by 1H-NMR, FTIR and DSC.It was found that the ring-opening addition reaction between B-a and LP-3 happened during mixing, and the resultants showed lower curing temperature and faster curing rate than the pure B-a.The thermal and mechanical properties of the cured materials with various LP-3 incorporations were measured by TGA, DMA, impacting and flexural test.The results showed that LP-3 was an effective toughener for polybenzoxazine from B-a.Materials containing LP-3 in the crosslinked network showed much better toughness than that without LP-3.With the increase of LP-3 incorporation, impacting strength increased while modulus and glass transition temperature (Tg) decreased.When 5 wt% LP-3 was added, the impacting strength of the cured material was about 3.4 times higher than that of the polybenzoxazine from pure B-a.Simultaneously, the material at this LP-3 content retained high storage modulus (E'=3.9 GPa at 30℃) and high glass transition temperature (Tg=206℃) with improved flexural properties and thermal stability (T5%=322℃, T10%=342℃).It was concluded that LP-3 was a promising modifier for the commercial B-a resin even with small addition amount.When the amount of LP-3 was 5 wt%, the cured material owned the best overall performance.
- Benzoxazine,
- Liquid polysulfide rubber,
- Toughening,
- Mechanical properties,
- Thermal properties
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