Citation: Feng-ke Du, Qiao-long Yuan, Fa-rong Huang. Studies on the Terpolymer of Poly(silylene-acetylenearyleneacetylene)/Benzoxazine/Cyanate Ester[J]. Acta Polymerica Sinica, ;2018, (3): 410-418. doi: 10.11777/j.issn1000-3304.2017.17099 shu

Studies on the Terpolymer of Poly(silylene-acetylenearyleneacetylene)/Benzoxazine/Cyanate Ester

Key Laboratory for Specially Functional Polymeric Materials and Related Technology of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237

Corresponding author: Qiao-long Yuan, qlyuan@ecust.edu.cn
Received Date: 24 April 2017
Revised Date: 18 May 2017

Bisphenol-A based cyanate ester (BACDy) and propargyloxy-containing benzoxazine (P-appe) were used to improve the mechanical properties of poly(silylene-acetylenearyleneacetylene) (PSA). PSA/P-appe/BADCy (PPB) terpolymers were prepared by blending in solution and concentrating with evaporation. The thermal cure reaction of the terpolymers were studied by differential scanning calorimetry (DSC) and in situ Fourier-transition infrared (FTIR) monitoring. The thermal properties, dynamic mechanical properties, flexural property and impact strength of the cured terpolymers were further investigated. The results show that the cure peak temperature of BADCy decreased from 325 ℃ to 247 ℃ when P-appe and PSA were added. In the blends, the ring opening of the P-appe firstly occurs with increasing cure temperature. Then the formation of the triazine ring arises. P-appe and phenolic hydroxyl groups on the ring-opened benzonxazine can catalyze the cyclotrimerization of the cyanate ester, making the cure temperature of the cyanate ester decrease effectively. Meanwhile, the self-polymerization of the terminal acetylene of PSA, P-appe and BADCy occurs simultaneously. The PPB terpolymer can polymerize at 130 ℃ within 2 h or at 170 ℃ within 30 min. The copolymerization of BACDy and P-appe arises from the coreaction of triazine ring cyclotrimeized by BADCy with oxazine of P-appe, by which the compatibility of PPB terpolymer is favorable. In comparison with cured PSA resin, the 5% mass loss temperature (T_d5) of the cured PPB terpolymer in nitrogen is above 510 ℃, and the residual yield at 800 ℃ and the glass transition temperature of the cured terpolymer are above 84% and 450 ℃, respectively. For PSA blended with 15% mass fraction of P-appe and 15% mass fraction of BADCy, the flexural strength and impact strength of the cured PSA resin can increase by 115% and 104%, respectively. The fracture surface of the cured terpolymer is rough and displays obvious ductile feature.
- Poly(silylene-acetylenearyleneacetylene),
- Bispehnol-A based cyanate ester,
- Propargyloxy-containing benzoxazine,
- Blend,
- Mechanical properties
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