煤大分子在有机溶剂中的溶解溶胀行为及其交联本性

Solubilization and Swelling of Coal andIts Crosslinking Nature

采用溶剂抽提与溶胀法研究了煤－煤及煤－溶剂间非共价键力对煤大分子溶胀行为的影响。煤在非极性溶剂中的溶胀行为反映了煤－煤分子间作用力的大小，煤在碳含量８１％～８３％范围内有最小的分子间作用力，溶胀率最大。煤在极性溶剂中的溶胀行为由煤－溶剂间作用强弱决定，其溶胀率随碳含量增加而减小。煤大分子交联键性质包括共价与非共价交联两部分的贡献。共价交联存在于结构单元之间，非共价交联主要存在于片断之间，部分存在于结构单元之间。

Solvent extraction and swelling of coal were used to investigate the effect of noncovalent bonding of coalcoal and coalsolvent on the swelling of coal.The swelling of coal in nonpolar solvent reflects the coalcoal interaction which is the weakest at the carbon content of 81%～83%(daf),while the swelling in polar solvents (hydrogen bonding solvents) is determined by the coalsolvent interaction which decreases with the increase of coal rank.The crosslinking of coal includes the contribution of both covalent crosslinks and noncovalent crosslinks.The structural units are mainly linked by covalent bonding and parttly connected by noncovalent bonding,whereas the segments are connected by noncovalent bonding.