Nanofiltration membrane prepared from polyacrylonitrile ultrafiltration membrane by low-temperature plasma: 5. Grafting of styrene in vapor phase and its application
Nanofiltration membrane prepared from polyacrylonitrile ultrafiltration membrane by low-temperature plasma: 5. Grafting of styrene in vapor phase and its application
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DOI：
10.1016/j.surfcoat.2006.09.114
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发表时间：
2007-04
影响因子：
5.4
通讯作者：
Jian Chen;Ji-ding Li;Zhiping Zhao;Dingcong Wang;Cuixian Chen
中科院分区：
文献类型：
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作者：
Jian Chen;Ji-ding Li;Zhiping Zhao;Dingcong Wang;Cuixian Chen
低温等离子体技术已被广泛应用于聚合物膜的表面改性。以聚丙烯腈超滤膜为原料，经Ar低温等离子体处理后，在气相中接枝单体苯乙烯，制得纳滤膜。采用FTIR-ATR光谱、DSC分析和接触角测量等手段表征了气相等离子体引发接枝聚合改性PAN膜的化学和物理变化。FTIR和DSC分析表明，疏水单体苯乙烯已成功接枝到PAN超滤膜表面。DSC分析还表明，随着接枝时间的延长，复合材料的平均孔径减小，孔径分布变窄。接触角测试结果表明，接枝膜的疏水性明显增强。在温度范围内测定了脱蜡油(MW≈)和脱蜡溶剂(甲苯和甲乙酮)的混合过滤性能，包括渗透通量(J)和截留率(R)。当原料组成为83.94wt.%脱蜡溶剂时，渗透液中的溶剂含量为98.42wt.%，润滑油的截留率可达90.2%，这表明该PAN膜可用于回收脱蜡润滑油中的脱蜡溶剂。
Low-temperature plasma techniques have widely been used to modify surface properties of polymer membranes. The NF membranes were prepared from PAN UF membrane by Ar low-temperature plasma treatment and subsequent grafting of the monomer styrene in vapor phase. FTIR-ATR spectroscopy, DSC analysis and contact angle measurement were used to characterize the chemical and physical changes of PAN membranes modified by plasma-induced graft polymerization in vapor phase. FTIR spectra and DSC analysis revealed that hydrophobic monomer, styrene, was successfully grafted onto PAN UF membrane surface. DSC analysis also indicated that the average pore size decreased and the pore size distribution was narrowed with increasing graft time. The contact angle measurement results showed that the hydrophobicity of the grafted membrane was significantly increased. The filtration performances including permeation flux (J) and rejection (R) were determined with a mixture containing dewaxed oil (Mw≈450 g/mol) and dewaxing solvent (toluene and methyl ethyl ketone) in the range of temperature. For the feed composition of 83.94 wt.% dewaxed solvent, the solvent in permeate solution was 98.42 wt.%, and the rejection of lube oil was up to 90.2%, which implied that these PAN membranes may be potentially used to recover the dewaxing solvent from the dewaxed lube oil.