【摘 要】
：
Poly(vinylidene fluoride) (PVDF) composite membranes blended with nano-crystalline cellulose (NCC) for ultrafiltration were prepared by a Loeb-Sourirajan (L-S)
【机 构】
：
College of Material Science and Technology
论文部分内容阅读
Poly(vinylidene fluoride) (PVDF) composite membranes blended with nano-crystalline cellulose (NCC) for ultrafiltration were prepared by a Loeb-Sourirajan (L-S) phase inversion process.The effects of NCC concentration on the membrane performances were investigated.Surface chemical compositions,surface and cross-section morphologies,degree of crystallinity and the thermal stability of the membranes were characterized by Fourier transform infrared spectroscopy (FTIR),scanning electron microscopy (SEM),X-ray diffraction (XRD) and thermal gravimetric analysis (TGA) respectively.The mechanical properties of the membranes were also investigated.All the experimental results indicated that the properties of the composite membranes were improved due to the addition of NCC.The pure water flux of composite membranes can reach 230.8 L/(m2 h) and increase up to 47.5 ％ compared with pure PVDF membranes.At the same time,the rejection ratio of a bovine serum albumin solution (1 g/L) was up to 92.5％.The porosity and the mean pore size of the composite membranes were 65％ and 49 nm,respectively.Due to the addition of NCC,the degree of crystallinity was increased to 52.1％ resulting in the enhanced mechanical properties.A typical asymmetric structure,which was composed of sponge-like dense layer and finger-like microporous support layer,was observed in SEM images of composite membranes.
其他文献
Automotive industry,as an important pillar of the national economy,has been rapidly developing in recent years.But proplems such as energy comsumption and envir
With increasing recording density in computer hard disks,the flying height of the magnetic head becomes 10 nm or less.The numerical method of the control equati
In wireless networks,the majority of cooperative communications rely on the high-accuracy timing synchronization among isolated nodes.However,most presented phy
Copper nano-particles were prepared by 100 kGy room temperature γ-ray irradiation of CuSO4 aqueous solution added with surfactant and inactive agent.Effects of
To determine the solutions of the well-known problem of a finite width strip with single edge crack,some results on elasto-plastic fracture analysis for metalli
The issue of the stability and controller design of Takagi-Sugeno(T-S) fuzzy control systems with time-delay is investigated under imperfect premise matching wh
A method and system for automatically and simultaneously measuring the light output of multiple scintillators,or each scintillating unit of an array,were develo
Recent years,cooperative technology has taken a lot of attention since it can improve the bit error rate (BER) and lower the transmit power in radio mobile netw
According to the requirement of automatization of drainpipe deposit cleaning work in the municipal engineering works,a kind of robot for drainpipe deposit clean
Porno video recognition is important for Internet content monitoring.In this paper,a novel porno video recognition method by fusing the audio and video cues is