Aminopropyl Terminated Polydimethylsiloxane (Reduced Volatility)

Ran, Qianping, et al. Journal of Vinyl and Additive Technology 23.4 (2017): 305-311.

Aminopropyl terminated polydimethylsiloxane was blended with epoxy resin (bisphenol A diglycidyl ether) system to improve its toughness. Mechanical testing showed that APDMS1 and APDMS2 improved the impact strength of epoxy resin with lower M values. The toughening effect decreased when APDMS4 was used. This indicates that APDMS with high M is more prone to agglomeration, resulting in lower toughening efficiency. This was also confirmed by scanning electron microscopy results.
The samples were prepared by mixing DER331, D230 and silicone (BADS or APDMS). The molar ratio of epoxy groups and amines in the system is also listed in Table (the -NH content in the system PDMS was calculated by 1H NMR), and the ratio of the two groups in each sample system was adjusted by D230. Sample EP is a control sample without BADS and APDMS; EPB-10 represents a blending system containing 10 parts by weight of BADS per 100 parts of resin (phr); EPA1-10 represents a blending system containing 10 parts of APDMS1. The specified rules are very consistent with other examples. Standard-sized samples are prepared using a casting mold. After the mixture is thoroughly stirred, each mixture is poured into a metal mold. The samples are cured in an oven at 60°C for 24 hours. Then, samples with gauges are obtained for tensile tests, bending tests, and impact strength tests. The main reaction equations of each system are shown in the figure. Rand R containing epoxy or amine reactive groups can further react with other reactive groups in the system to form a three-dimensional cross-linked structure.