采用双螺杆挤出的方法制备了低密度聚乙烯(LDPE)/玻璃载体银系抗菌剂(IONPURE)的抗菌塑料.用溶出伏安法测定了抗菌塑料中银离子的溶出速率,用差示扫描量热法(DSC)研究了抗菌LDPE的熔融和结晶行为,用XRD和POM对LDPE的晶形和结晶度进行了表征,结果表明,抗菌剂在LDPE中起到异相成核的作用,随着其含量从0%增加到8%,LDPE结晶度呈现先增加后下降的趋势,而晶粒尺寸则逐渐减小.同时,通过加速溶出实验研究了不同结晶度抗菌LDPE样品中银离子的溶出行为,发现样品结晶度越大,银离子溶出速率越小,并且随着在水中浸泡时间的延长,结晶度影响越发明显.
low density polyethylene(LDPE) /glass antimicrobial agent(IONPURE) system was prepared by twin screw extruder.The silver ion release characteristics of these composites was measured by anode stripping voltammetry.The melting behaviour of the composites were evaluated by differential scanning calorimetry(DSC), the crystallinity and crystalline morphology of LDPE were characterized by X-ray diffraction(XRD) and polarization microscope(POM).The results indicate that the crystallinity of LDPE increases at first and then decreases a little with the addition of Ag~+ antimicrobial agents.And also the crystal size of LDPE is reduced.On the other hand, the crystallinity of LDPE matrix plays an important role on the Ag~+ release from the antimicrobial agents.Higher crystallinity of LDPE results in lower rate of Ag~+ release and the effect of LDPE crystallinity on the Ag~+ release process becomes more evident along with time.
参考文献
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