以对甲基苯甲醛和木糖醇为原料,合成成核剂二(对甲基苄叉)木糖醇(MDBX).以环已烷为反应溶剂,对甲基苯甲醛与木糖醇物质的量比为2.4:1,甲醇和对甲基苯磺酸用量分别为基料质量分数的430%和4.0%时,MDBX的收率最高,为97.7%,熔程为244℃～246℃.以MDBX为成核剂,使用溶液沉淀法制备MDBX质量分数分别为0.0%、0.1%、0.3%、0.5%的粉末聚丙烯样品,采用红外光谱仪、差示扫描量热仪,X衍射仪和偏光显微镜等方法,研究了PP结晶性能.结果表明,MDBX是PP的有效a晶型诱导剂,MDBX的加入能诱导大量球晶生成,结晶度提高,FT-IR,X-ray衍射和DSC等分析结果一致,即在PP中添加0.5%MDBX时,聚丙烯的改性效果最好,PP的结晶度达到最大值.
1,3-2,4-di(p-methylbenzylidene)xylitol(MDBX)has been synthesized in the lab from p-methyl benzaldehyde and xylitol.Under the optimized reaction conditions that cyclohexane waft used as solvent,the molar ratio of p-dimethyl benzaldehyde to xylitol was 2.4:1,and the mass fractions of catalyst and accelerator to raw materials were 4.0%and 430%respectively,the yield of MDBX exceeded 97.7%,and the melting point was 244℃～246℃.A series of PP samples wag prepared based on the amount of nucleating agent used.The effect of MDBX on their crystalline structures and thermal property FT-IR,DSC,WAXD,polarized light microscopy,and so on.Extensive experiments demonstrate that MDBX can nucleate PP effectively and efficiently in a form of crystalline morphology,induce the generation of a large spherulites and increase the crystalline density.The great improvement of optical properties can be achieved with 0.5%addition of MDBX.
参考文献
| [1] | 徐燕芬,王克,江波.聚丙烯新型成核剂的合成与应用[J].高分子材料科学与工程,2005(06):59-62. |
| [2] | 王静波,窦强,李怀栋.聚丙烯透明成核剂研究进展[J].中国塑料,2006(06):8-13. |
| [3] | 张志秋,李翠勤,汪颖军,王俊.木糖醇类成核剂的合成与性能研究[J].塑料工业,2006(12):4-6. |
| [4] | 熊芬,肖兆新,鲁德平,管蓉.α-成核剂对聚丙烯结晶性能和形态的影响[J].现代塑料加工应用,2006(01):39-42. |
| [5] | 张跃飞,辛忠.取代芳基杂环磷酸金属盐类成核剂在等规聚丙烯中的成核效应[J].化工学报,2006(04):953-958. |
| [6] | Nagasawa S;Fujimori A;Masuko T;Iguchi M .Crystallisation of polypropylene containing nucleators[J].Polymer: The International Journal for the Science and Technology of Polymers,2005(14):5241-5250. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%