利用自行设计制造的剪切拉伸双向复合应力场挤管装置生产出了双向增强的短玻璃纤维/高密度聚乙烯/聚丙烯（SGF/HDPE/PP）管材,研究分析了应力场对复合体系管材的拉伸强度、微观分子取向和结晶的影响。结果表明,在200℃以下时,该应力场能改善管材的强度,在保持管材轴向拉伸强度不降低的情况下,其周向拉伸强度的最高改善量达到40.9%,且随着温度的升高而逐渐提高;分子的结晶度也随着温度和转速的升高而增加;同时该应力场促进了分子的取向分布,但分子的解取向效应却随着温度的升高而变得更加严重。
Utoizing shearing-drawing two-dimensional compound stress field pipe-extrusion die developed by the authors,two-dimensional reinforcement short glass fiber/high density polyethylene/polypropylene（SGF/HDPE/PP） pipes were extruded.The tensile strength,molecule orientation and crystallinity were studied.The results indicate that,when the temperature is below 200 ℃,the tensile strength of SGF/HDPE/PP pipes is improved by shearing-drawing two-dimensional compound stress field.The most improvement of circular tensile strength is 40.9% and the axial tensile strength doesn’t decrease.And the circrlar tensie strength increase with the increase of temperature.Molecule crystallinity increases with the temperature and rotating speed rising too.The compound stress field makes molecule orientation.But the molecule disorientation becomes more obvious with temperature increasing.
参考文献
| [1] | Lonkar, SP;Morlat-Therias, S;Caperaa, N;Leroux, F;Gardette, JL;Singh, RP .Preparation and nonisothermal crystallization behavior of polypropylene/layered double hydroxide nanocomposites[J].Polymer,2009(6):1505-1515. |
| [2] | 郑艳红,沈志刚,蔡楚江,麻树林,邢玉山.废印刷电路板非金属粉增强及磨碎玻璃纤维增强聚丙烯力学性能[J].复合材料学报,2009(02):59-66. |
| [3] | Fu SY.;Mai YW.;Lauke B.;Yue CY. .Synergistic effect on the fracture toughness of hybrid short glass fiber and short carbon fiber reinforced polypropylene composites[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2002(1/2):326-335. |
| [4] | 袁毅,李安定,申开智.复合应力场双向增强塑料管材的研究[J].高分子材料科学与工程,2005(03):216-218. |
| [5] | 樊在霞,张瑜,陈彦模.冷却方式对GF/PP复合纱针织物复合材料基体结晶结构的影响[J].复合材料学报,2007(03):52-58. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%