《Low Dielectric Polymers with High Thermostability Derived from Biobased Vanillin》 was published in ACS Sustainable Chemistry & Engineering in 2020. These research results belong to Dai, Menglu; Tao, Yangqing; Fang, Linxuan; Wang, Caiyun; Sun, Jing; Fang, Qiang. Application of 1779-49-3 The article mentions the following:
Vanillin has recently been prepared on a large scale from lignin, which becomes the second largest renewable resource. Because it has a naturally aromatic ring and an easily modified functional group, vanillin is considered as one of the ideal feedstocks for the synthesis of high-performance polymers. Based on this, there are a few investigations on low dielec. polymers derived from vanillin, and we have designed and synthesized a monomer containing crosslinkable vinyl and benzocyclobutene units starting from vanillin. This monomer can be easily thermally polymerized into a crosslinked network, which displays good thermostability with a 5% weight loss temperature (T5d) of up to 436°C and a coefficient of thermal expansion (CTE) of 60.9 ppm/°C. Moreover, no obvious glass-transition temperature (Tg) of the crosslinked network is observed from room temperature to 400°C during the dynamic mech. anal. (DMA). In addition, the DMA test indicates that the crosslinked network exhibits good mech. properties with a storage modulus of up to 3.89 GPa at room temperature Furthermore, the crosslinked network displays good dielec. properties with a dielec. constant (Dk) of less than 2.84 and a dissipation factor (Df) of below 4.9 × 10-3 for frequencies ranging from 0.15 to 20 MHz. At a high frequency of 5 GHz, the crosslinked network exhibits a Dk of 2.81 and a Df of 6.79 × 10-3, resp. When the crosslinked polymer is immersed in water at room temperature for 96 h, it shows a low water uptake of 0.44%. These results indicate that the new biobased thermosetting resin has potential applications as a matrix resin or an encapsulation material in the microelectronic industry. Heating a new functional monomer (BCB-V) derived from vanillin gave a crosslinked network, displaying good hydrophobicity, film uniformity, thermostability, and dielec. properties at a high frequency of 5 GHz. In the experiment, the researchers used Methyltriphenylphosphonium bromide(cas: 1779-49-3Application of 1779-49-3)
Methyltriphenylphosphonium bromide(cas: 1779-49-3) is an organophosphorus compound, with potential use as a precursor and a solvent in organic synthesis. And it is used widely for methylenation via the Wittig reaction.Application of 1779-49-3
Referemce:
Bromide – Wikipedia,
bromide – Wiktionary