冷却速率对PP／GF微发泡复合材料发泡行为及力学性能的影响.pdf

塑料T业
第44卷第1期
CHINA PLASTICS INDUSTRY
2016年1月
冷却速率对PP/GF微发泡复合材料发泡行为
及力学性能的影响
高萍…2,何力2”,王昌银2,蒋团辉,王醴均,龚维2“
1.贵州大学化学与化工学院,贵州贵阳5905;2.国家复合改性聚合物材料工程技术研究中心,贵州贵阳550014
3.贵州师范大学材料与建筑工程学院,贵州贵阳550014)
摘要:采用化学发泡法注塑成型工艺制备了聚丙烯/玻纤(PP/CF)复合发泡材料,研究了冷却速率对其发泡行
为和力学性能的影响,并通过流变测试分析了复合材料不同冷却速率下的黏弹性变化规律。结果表明,冷却速率提
高,复合材料的黏弹响应越明显,从而改善了PP/GF复合材料的发泡行为。当冷却速率为6.6℃/s时,PP/GF复合
材料的发泡效果最好,泡孔平均直径为29.54pm,泡孔密度为1.01x10个/em2;此时材料的力学性能最优,拉伸和
冲击强度最大,分别为39.8MPa和5.52kJ/m2
关键词:化学发泡;冷却速率;流变性能;发泡行为;力学性能
doi:10.3969/j.issn.1005-5770.2016.01,014
中图分类号:TQ325.1'4
文献标识码:A
文章编号:1005-5770(2016)01-0056-04
Effect of Cooling Rate on the Foaming Behaviors and Mechanical Properties of
PP/GF Micro-foaming Composites
GAO Ping", HE Li", WANG Chang-yin, JIANG Tuan-hui", WANG Li-jun", GONG Wei
(1. College of Chemistry and Chemical Engineering, Guizhou University, Guiyang550003, China
2. National Engineering Research Center for Compounding and Modification Polymeric Materials, Guiyang 550014, China
3. School of Material and Building Engineering, Guizhou Normal University, Guiyan 550014, China
Abstract: The PP/GF micro-foaming composites were prepared by chemical foaming method in an
injection molding machine. This study focused on the effects of the cooling rate on the foaming behaviors and
mechanical properties of the composites, and the rheological properties were also analyzed under different
cooling rates. The results indicate that the foaming behavior improves with the increase of cooling rate, which
is ascribed to the enhanced rheological response. When the cooling rate is 6. 6 C/s, the foaming behavior of
PP/GF composites is the best, the average cell diameter is 29. 54 wm and the cell density is 1. 0lx10'cells/
cm; meanwhile, the tensile and impact strength of the composite at this cooling rate reach the highest value
of 39.8 Mpa and 5. 52 KJ/m", respectively
keywords: Chemical Foaming; Cooling Rat
Cooling Rate; Rheological Properties; Foaming Behavior; Mechanical
聚丙烯(PP)微发泡材料具有质轻、比强度高、聚合物发泡材料的力学性能,加人玻纤(CF)是
隔热、隔音、抗震能力强等优点,广泛应用在包装、种经济有效的方法, Jacobs研究了改性短玻纤
建筑、医药和体育等领域?3列。然而,聚合物发泡(SCF)增强发泡PP/乙烯一辛烯共聚物(POE)复合
后,材料的有效承载面积减少且大泡孔周围产生的裂材料的力学性能。结果表明,加人SCF,PP/POE发
纹容易扩展,从而导致聚合物发泡制品的力学性能下泡材料的冲击强度提高,弯曲强度和压缩强度随着
降,限制了发泡聚合物的工业化应用4。为了提高SGF含量的增加呈现先上升后下降的趋势。郭于林
黔科合重大专项字(2012)6023号,黔科合人オ团队「2014]4006号,白科合同[2014]82号
*通信联系人proline@c163.com**通信联系人gw20030501?163.com
作者简介:高萍,在读硕土研究生,主要从事聚烯烃微发泡材料的研究。pgdogzu@163.com