检索规则说明:AND代表“并且”;OR代表“或者”;NOT代表“不包含”;(注意必须大写,运算符两边需空一格)
检 索 范 例 :范例一: (K=图书馆学 OR K=情报学) AND A=范并思 范例二:J=计算机应用与软件 AND (U=C++ OR U=Basic) NOT M=Visual
机构地区:[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510640
出 处:《林产化学与工业》2014年第2期23-28,共6页Chemistry and Industry of Forest Products
基 金:国家自然科学基金资助项目(31270638);国家重大基础研究课题(2013CB228101)
摘 要:以木质素磺酸钙( Ca-Ls)为原料,运用元素分析、傅里叶变换红外光谱( FT-IR)手段对其化学结构和性能进行表征,利用热重分析法( TG)和热解-气相色谱/质谱联用( Py-GC/MS)技术研究木质素磺酸钙的热裂解特性。研究发现:木质素磺酸盐相对于草本类木质素具有较低的碳含量及氮含量,较高的硫含量;木质素磺酸钙含有较丰富的愈创木基(G型)与紫丁香基(S型)结构单元;木质素磺酸钙热解分为4个阶段,主要热解温度范围为150-450℃;升温速率为10、20、30℃/min时,热失重微分曲线上最大失重峰向高温迁移,同时随着升温速率的增大,木质素磺酸钙热解时样品颗粒达到热降解所需温度的响应时间变短,木质素磺酸钙热分解速率增大,从而改变了木质素发生热降解反应的进程。Calcium lignosulfonate ( Ca-Ls ) was selected as the raw material. Its chemical structure and property were characterized by means of elemental analysis and Fourier transform infrared spectroscopy ( FT-IR) . The pyrolysis characteristics were also analyzed by thermal gravimetric analysis ( TG ) and pyrolysis-gas chromatography combined with mass spectrometry (Py-GC/MS). The results showed that:1) Ca-Ls had a lower carbon and nitrogen content and higher sulfur content than lignin from herbal wood;2) Ca-Ls contained rich guaiacyl (G-type) and syringyl (S-type) structure unit;3) the pyrolysis of Ca-Ls was divided into four stages, and the main pyrolysis temperature range was 150-450 ℃;4) when heating rate was 10, 20 and 30 ℃/min, the biggest weight loss peak on the DTG curves migrated to higher temperature, meanwhile, as the heating rate increased, the response time for sample particles to reach the desired pyrolysis temperature became shorter. Thus the thermal decomposition rate increased and the process of thermal decomposition of Ca-Ls was changed.
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在链接到云南高校图书馆文献保障联盟下载...
云南高校图书馆联盟文献共享服务平台 版权所有©
您的IP:216.73.216.117