PET/PC/含溴高分子阻燃剂共混物

采用熔融挤出共混的方法制备了聚对苯二甲酸乙二酯/聚碳酸酯/溴化聚苯乙烯(PET/PC/BPS)阻燃共混物。利用极限氧指数(LOI)测定仪,热重–红外联用分析仪和扫描电子显微镜(SEM)等对共混物的阻燃性能、热稳定性和炭层形貌进行了表征。结果表明,当BPS的含量从0逐渐增加至7.5份时,LOI从21%逐步增加到26%,阻燃等级也从UL94 V–2级逐步上升到V–0级。热重–红外联用与SEM结果表明,BPS的加入会促使基体瞬间放出大量CO2,起到了较好的气相阻燃作用。

CHARACTERIZATION OF NOVEL POLYMERIC INTERMEDIATE POLY(p-BROMOACETYL STYRENE) CROSSLINKED BY DIVINYLBEZENE QU Rongjun

Acetyl crosslinked polystyrene (EPS) and crosslinked bromoacetyl polystyrene (BEPS)beads were synthesized by Fridel-Crafts acetylation of polystyrene (PS) and bromination of EPS respectively. FTIR, XPS, and TG-TDG were employed to characterize their structures. The results revealed there are two types of bromine in the BEPS molecule. One is in the main chain of polystyrene and the other is in the acetyl. The results of TG-DTG showed that the rates of loss weight of PS, EPS, and BEPS were 92.7%, 92.2%, and 81.3% among the 300 ℃～500 ℃; 7.3%, 7.8%, and 18. 7% in 594 ℃, 660 ℃, and 584.8 ℃, respectively.

两性荷电纳滤膜的研究

通过紫外辐照接枝法在酚酞基聚芳醚酮(PEK-C)超滤膜表面依次接枝苯乙烯磺酸钠(SSS)和甲基丙烯酰氧乙基三甲基氯化铵(DMC)制成了一种亲水性、表面载有两种不同电荷的纳滤膜。通过测定膜对不同盐溶液表观截留率的变化,系统研究了单体浓度、接枝时间对膜分离性能的影响。结果表明,采用该方法制成的亲水性两性纳滤膜对高价正负离子组成的盐(MgSO4)及低价正离子、高价负离子组成的盐(Na2SO4)都显示出很好的截留效果。

用于formose反应的固载型催化剂的制备研究

采用白球做载体,通过溴乙基将苯并噻唑固载在白球上,制得交联聚苯乙烯固载型苯并噻唑鎓盐催化剂,并将其用于甲醛聚糖反应。试验分别考察了反应温度、反应时间等对催化剂制备的影响,并通过红外光谱检测其结构特征。结果表明,催化剂的最佳制备条件为110℃反应20 h。该催化剂可以有效地催化甲醛聚糖反应,便于回收套用。