Transparent methyl methacrylate-acrylonitrile-butadiene-styrene (MABS) resin was prepared by blending the matrix resin with rubber toughened particles. The refractive index of matrix resin was characterized, which proved the transmittance of MABS resin improved with decreasing differences in the two-phase refractive index. Controlling the refractive index of the matrix resin was comparable to that of rubber, increasing acrylonitrile (AN) content in the matrix resin to improve toughening efficiency of the rubber particles to the matrix. When the proportion of poly(methyl methacrylate)/poly(styrene-co-acrylonitrile) (PMMA/SAN) was 71.6/28.4 or the initial weight ratio of MMA/St/AN was 78/16.5/5.5, the MABS resin had an optimal transmittance of 90 %. The AN content of the former was 6.5 %, and the impact strength was 155 J/m. The actual AN content of the latter was 12.5 %, and the impact strength was 172 J/m. Additionally, the refractive index of methacrylate-styrene-acrylonitrile (MSAN) decreased with increasing monomer conversion. When the monomer conversion reached 76.5 %, the change in the composition of MSAN was insignificant as the monomer conversion continued to increase. Moreover, MABS resin had a broad processing temperature window with MSAN copolymer as the matrix resin compared to the blends of PMMA and SAN, which were 170–240 °C and 190–200 °C, respectively.
Lu Xu,Baijun Liu,Mingyao Zhang,Yang Bai,Jinming Zhang,Jiayin Song
A series of methacrylate-acrylonitrile-butadiene-styrene (MABS) resins was prepared using bulk polymerization. The polarity of the continuous phase and the compatibility of two phases were changed by adjusting the methyl methacrylate (MMA) content, choosing values that were close to styrene-butadiene rubber solubility value. The possibility of controlling the microstructure of the MABS resin by changing the polarity of the components and the compatibility of two phases was assessed. The dynamic mechanical analysis shows that the compatibility of two phases varies with the MMA content. The morphological analysis shows that increasing MMA contents results in a gradual decrease in the sub-inclusion structure with a network skeleton of rubber particles, and that all the particles become solid rubber when the MMA content reaches 75%. The sub-inclusion structure reappears but does not have a network skeleton when the MMA content is 90%. The impact strength and morphological analysis indicate that the solid rubber particles and the sub-inclusion structure with a network skeleton provide excellent toughness, while the sub-inclusion structure without a network skeleton does not. In contrast, the transmittance of the ABS resin first increased and then decreased with increasing MMA content.
Methyl methacrylate-acrylonitrile-butadiene-styrene (MABS) was obtained by blending the rubber phase with matrix resin. Matching the refractive index was crucial for transmittance in MABS resins. Additionally, the superimposed effect of particle size and the interfacial area further determined the MABS resin transparency. The MABS resin with a rubber particle size of 201nm had a transmission of 88.9% when the refractive indexes of the two phases were close. By utilizing a bimodal distribution of toughened particles in the phase domain structure, the rubber particle size could be altered while maintaining control over the interfacial area. It resulted in an increase in the transmittance of the MABS to 90.1%. The analysis of mechanical properties and morphology shows that the phase structure with a bimodal distribution of toughened particles is also beneficial to the impact and tensile strength of MABS resin. When toughening particles with a size of 73nm and 304nm were mixed in a mass ratio of 60:40, the impact strength was 145 J/m, the tensile strength was 47MPa, and the elongation at break was 20%. And the study investigated the impact of rubber content on the properties of transparent MABS resins.
危险品化学品经营许可证（带存储）