Inverse vulcanization below the melting point of sulfur,Materials Chemistry Frontiers

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Inverse vulcanization below the melting point of sulfur
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2020/01/01 , DOI: 10.1039/c9qm00606k
Bowen Zhang _{1,

2,

3,

4,

5} , Hui Gao _{4,

5,

6} , Peiyao Yan _{1,

2,

3,

4,

5} , Samuel Petcher _{1,

2,

3,

4,

5} , Tom Hasell _{1,

2,

3,

4,

5}

Affiliation

Elemental sulfur is an abundant by-product of the petrochemical industry, but polymers formed from pure sulfur cannot be used because they are not stable and depolymerize to the monomer, S₈. Inverse vulcanization reported recently uses vinylic monomers as crosslinkers to stabilize polymers made from elemental sulfur. Here we report that the catalyst sodium diethyldithiocarbamate trihydrate allows inverse vulcanization to be conducted at low temperatures (110 °C), even below the melting point of sulfur (120 °C). Lower reaction temperatures are beneficial for not only energy economy, but also in preventing dangerous auto-acceleration and hydrogen sulfide generation, and allowing low boiling point monomers to be used. Excess catalyst can be recovered from the polymers, and despite a crosslinked structure, the reversibility of the S–S bonds allows the polymers to be recycled.

中文翻译：

低于硫熔点的反向硫化

元素硫是石化工业中大量的副产物，但是不能使用由纯硫形成的聚合物，因为它们不稳定且会解聚为单体S ₈。最近报道的反向硫化使用乙烯基单体作为交联剂来稳定由元素硫制得的聚合物。在这里我们报告说，催化剂二乙基二硫代氨基甲酸钠三水合物允许在较低的温度（110°C）甚至低于硫的熔点（120°C）下进行反向硫化。较低的反应温度不仅有利于节能，而且有利于防止危险的自动加速和硫化氢的产生，并允许使用低沸点单体。可以从聚合物中回收过量的催化剂，尽管具有交联结构，但S–S键的可逆性使聚合物得以循环利用。

更新日期：2020-02-13

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