摘要
以超支化聚酯C100为流动促进剂提升聚酰胺6(PA6)、含磷共聚PA6(CoPA6)的流动性能与阻燃性能,采用双螺杆挤出机共混挤出制备了C100添加量为1~4 phr的PA6/C100与CoPA6/C100复合材料。为探究C100对PA6、CoPA6性能的影响,对复合材料的熔融结晶行为、流变特性、阻燃性能及力学性能进行了系统表征。结果表明,适量C100的引入有异相成核作用,促进PA6及CoPA6在更高的温度下结晶;C100有助于提升熔体的流变性能,当添加量为4 phr时,PA6和CoPA6在低频段(0.1 Hz)的黏度降幅分别为81%和73%,在高频段(100 Hz)仍保持76%和79%的显著降幅;PA6与CoPA6的拉伸强度随C100的引入呈现先升高后降低的趋势,当C100添加量为3 phr时,CoPA6/3phrC100的拉伸强度由CoPA6的68.3 MPa降至66.9 MPa,但断裂伸长率由115.5%提高至171.8%;C100可显著提升材料的阻燃性能,CoPA6/3phrC100和CoPA6/4phrC100的极限氧指数由CoPA6的26.4%分别提升至29.6%和30.4%、垂直燃烧测试均达到UL 94 V-0级,这是因为C100能有效提升熔体的流动性能,在燃烧时可促进带焰熔体滴落及时带走燃烧区域热量,抑制火焰蔓延,从而提升材料的阻燃性能,为开发阻燃聚酰胺材料提供了新思路。
Hyperbranched polyester C100 was employed as a flow promoter to enhance the fluidity and flame retardancy of polyamide 6(PA6)and phosphorus-containing copolyamide 6(CoPA6).PA6/C100 and CoPA6/C100 composites with C100 contents ranging from 1 phr to 4 phr were prepared using a twin-screw extruder.To investigate the effects of C100 on the properties of PA6 and CoPA6,systematic characterizations of the melting and crystallization behavior,rheological properties,flame retardancy,and mechanical properties of the composites were carried out.The results indicate that the introduction of an appropriate amount of C100 exerts a heterogeneous nucleation effect,which promotes the crystallization of PA6 and CoPA6 at higher temperatures.C100 contributes to the improvement of melt rheological properties:when the addition amount is 4 phr,the viscosity reductions of PA6 and CoPA6 at low frequency(0.1 Hz)reach 81%and 73%,respectively,while significant reductions of 76%and 79%are still maintained at high frequency(100 Hz).The mechanical properties of PA6 and CoPA6 show a trend of first increasing and then decreasing with the introduction of C100.When the C100 content is 3 phr,in the CoPA6 system,the tensile strength decreases from 68.3 MPa of CoPA6 to 66.9 MPa,while the elongation at break increases significantly from 115.5%to 171.8%.C100 can remarkably enhance the flame retardancy of the materials;the limiting oxygen index values of CoPA6/3phrC100 and CoPA6/4phrC100 are increased from 26.4%of CoPA6 to 29.6%and 30.4%,respectively,and both achieving the UL 94 V-0 rating in the vertical burning test.This is attributed to the fact that C100 can effectively improve the melt fluidity,which promotes the dripping of flaming melt during combustion to timely remove heat from the burning area and inhibit flame spread,thereby enhancing the flame retardancy of the materials.This work provides a new insight for the development of flame-retardant polyamide materials.
作者
李如意
周燕飞
韦相宇
刘可
LI Ruyi;ZHOU Yanfei;WEI Xiangyu;LIU Ke(School of Materials Science and Engineering,Zhejiang Sci-Tech University,Hangzhou 310018,China)
出处
《工程塑料应用》
北大核心
2026年第3期31-37,共7页
Engineering Plastics Application
基金
国家自然科学基金项目(52303016)。
关键词
聚酰胺6
超支化聚酯
流变特性
阻燃性能
力学性能
polyamide 6
hyperbranched polyester
rheology property
flame retardant property
mechanical property
