共查询到19条相似文献,搜索用时 109 毫秒
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研究了在玻纤增强的聚碳酸酯(PC)/聚对苯二甲酸丁二酯(PBT)合金中PBT的结晶行为。发现PBT的结晶过程是由两种相反的影响共同决定的,一方面玻纤能够诱导PBT成核,加快PBT的结晶速率;另一方面,PC会抑制PBT结晶,降低PBT的结晶速率。同时发现在不同组成比下,PC/PBT合金会形成不同的相形貌,也会影响玻纤对PBT结晶的成核作用和PC对PBT结晶的抑制作用,进而使PBT呈现加速结晶、分级结晶或者受限结晶行为。基于以上结果,提出了玻纤增强PC/PBT合金中PBT的结晶机理。同时考察了PC/PBT合金的结晶行为和热性能之间的关系。 相似文献
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聚磷酸三聚氰胺对玻纤增强PA66的膨胀阻燃作用 总被引:9,自引:2,他引:7
采用自制的新型膨胀型阻燃剂——聚磷酸三聚氰胺(MPP)对玻纤增强PA66进行阻燃,以氧指数和垂直燃烧(UL94)评价了其阻燃作用;以热失重测定了材料的热分解性能;以扫描电镜观察了材料残炭的结构;并探讨了MPP阻燃玻纤增强PA66的阻燃机理。试验表明,单一MPP对玻纤增强PA66有良好的阻燃效果,当添加25%时,阻燃材料的氧指数为38,0%,达到UL94V-0级;MPP参与了玻纤增强PA66的降解过程,在材料表面形成了致密的隔热、隔氧的泡沫炭层。 相似文献
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PA66 /PET/滑石粉复合材料研究 总被引:2,自引:0,他引:2
考察了滑石粉对聚酸胺66聚对苯二甲酸乙二醇酷(PA66 /PET)合金微观相形态、力学性能、耐热性能及结晶行为等方面的影响及其作用机制。结果表明:在使用适当的稳定剂和助剂配合的条件下,添加5%一10%的滑石粉,将使PA66 /PET合金的力学性能得到显著的改善;滑石粉的添加,可以显著地减小PET分散相粒子的平均粒径及其粒径分布,起到了改善PA66/PET共混体系混溶性的作用,其增容机制被认为与其片层对 PET相的切割作用和物理阻隔作用有关;滑石粉的添加可使体系中PA66部分的△Hc减小而使PET部分的△Hc增加;滑石粉的加人导致材料强度、刚性和耐热性提高,可能与其片层对PA66基体及其对PA66 /PET之间微观相界面的增强作用有关。 相似文献
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高效膨胀性阻燃剂阻燃玻纤增强尼龙6的研究 总被引:4,自引:0,他引:4
以合成高聚合度的聚磷酸蜜胺为主阻燃剂,以自制的阻燃剂F为协同阻燃剂,复配成新型无卤膨胀性阻燃剂ANTI-9。研究了不同摩尔比的蜜胺/磷酸合成的聚磷酸蜜胺对玻纤增强尼龙(PA)6阻燃性能的影响,考察了ANTI-9对玻纤增强PA6的阻燃性能、力学性能的影响。结果表明,当蜜胺/磷酸的摩尔比为1.2时合成的聚磷酸蜜胺的阻燃性能最好,且产率和耐水性也比较好。在玻纤增强PA6中添加25%~30%的ANTI-9时,其阻燃性能可以达到UL94V-0级,且阻燃玻纤增强PA6的综合性能达到国外同类产品的指标。 相似文献
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在质量分数30%玻璃纤维(GF)增强聚对苯二甲酸丁二酯(PBT)的基础上,通过引入不同含量的聚对苯二甲酸乙二酯(PET)组分制备了不同PBT/PET比例的合金。系统研究了PET含量对合金的傅立叶变换红外光谱(FTIR)、熔融结晶行为、力学性能、流动性能及外观的影响。实验结果显示:PET引入后,合金的FTIR谱图中出现了PET特征吸收峰(1 341cm-1);由于发生了部分酯交换反应,合金中PBT和PET的结晶能力减弱;PET的加入提高了GF增强PBT的力学性能,拉伸强度和弯曲强度分别能够提高10.1%和8.9%;相较于GF增强PBT,GF增强PBT/PET合金的流动性有所提高;同时,GF增强PBT/PET合金注塑制品的外观得到显著改善,样品表面浮纤面积占比由GF增强PBT的7.6%降低至GF增强PBT/PET合金(PET质量分数为40%)的0.4%。当PET质量分数为20%~35%时,所得PBT/PET合金同时具备优异的力学性能和良好的外观。 相似文献
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对玻纤增强不同配比PBT/PCT合金的力学性能,热稳定性,耐热氧老化性能进行了研究。结果表明,在玻纤增强PBT/PCT合金体系中,PCT树脂含量的增加会影响玻纤增强PBT/PCT合金体系的力学强度,但PCT树脂含量增加,可以改善PBT/PCT合金体系的韧性;同时合金体系中,PCT树脂含量增加会提高玻纤增强PBT/PCT合金体系的热稳定性; PCT树脂含量的提高对于提升PBT/PCT合金体系的初始和热氧老化后的反射率和亨特白度有利。应用研究为玻纤增强PBT/PCT合金的工业化生产提供了参考。 相似文献
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增强阻燃PBT的性能研究 总被引:1,自引:1,他引:0
采用硅烷偶联剂对玻纤进行处理性,探讨了螺杆转速和螺杆组合对阻燃增强聚对苯二甲酸丁二醇酯(PBT)力学性能的影响;并研究了不同玻纤、PBT、阻燃剂对增强阻燃PBT抗水解性能的影响。结果表明:处理玻纤提高了玻纤和基体界面的相互作用,复合材料的拉伸、弯曲和缺口冲击强度分别提高了10.6%、13%和19.6%;主机螺杆转速过高或螺杆组合的剪切过强都会使玻纤长度低于0.4 mm而降低增强作用,导致材料的力学性能下降。水煮后增强阻燃PBT力学性能的下降幅度主要取决于玻纤和树脂之间的界面,玻纤ECR5303A-2200增强阻燃的PBT的拉伸、弯曲和缺口冲击强度的保持率分别为水煮前的96%、88%和75%;其次为阻燃剂,树脂基体影响最小。加入自制增韧剂可显著降低增强阻燃PBT的端羧基浓度,从而有效提高其抗水解性。 相似文献
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The functionalization of poly(butylene terephthalate) (PBT) has been accomplished in a twin screw extruder by grafting maleic anhydride (MA) using a free radical polymerization technique. The resulting PBT‐g‐MA was successfully used as a compatibilizer for the binary blends of polyester (PBT) and polyamide (PA66). Enhanced mechanical properties were achieved for the blend containing a small amount (as low as 2.5 %) of PBT‐g‐MA compared to the binary blend of unmodified PBT with PA66. Loss and storage moduli for blends containing compatibilizer were higher than those of uncompatibilized blends or their respective polymers. The grafting and compatibilization reactions were confirmed using FTIR and 13C NMR spectroscopy. The properties of these blends were studied in detail by varying the amount of compatibilizer, and the improved mechanical behaviour was correlated with the morphology with the help of scanning electron microscopy. Morphology studies also revealed the interfacial interaction in the blend containing grafted PBT. The improvement in the properties of these blends can be attributed to the effective interaction of grafted maleic anhydride groups with the amino group in PA66. The results indicate that PBT‐g‐MA acts as an effective compatibilizer for the immiscible blends of PBT and PA66. © 2000 Society of Chemical Industry 相似文献
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啮合同向双螺杆挤出机的螺杆构型对玻璃纤维增强PA66/PA6合金力学性能的影响 总被引:1,自引:0,他引:1
刘志忠;汪克风;陶巍;王成望 《中国塑料》2009,23(10):92-96
研究了在加工温度、螺杆转速、喂料速度等加工工艺相同的情况下,不同螺杆构型对玻璃纤维增强PA66/PA6合金产品力学性能的影响。结果表明:合理的螺杆构型可以得到力学性能优良的玻璃纤维增强PA66/PA6合金产品。通过对螺杆构型的调整,玻璃纤维增强PA66/PA6合金产品的拉伸强度、弯曲强度、冲击强度分别由56MPa、100MPa、64J/m提高至169MPa、238MPa、136J/m。 相似文献
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High density polyethylene (HDPE) and polyamide (PA66) are well known to be incompatible. An ionomer (Surlyn) was added as a compatibilizer to HDPE and glass fiber reinforced (HDPE/GFRPA66) and non‐reinforced (HDPE/PA66) blends. Two compositions were considered: 25/75 wt % and 75/25 wt %, with an emphasis on the former formulation. The influence of the compatibilizer on the rheology, thermal properties, and the morphology, as well as mechanical properties of the blends, was investigated using melt flow index measurements, DSC, scanning electron microscopy (SEM), and impact strength. The ionomer was found to be more effective as a compatibilizer with HDPE as a minor phase compared to the case when HDPE becomes the major phase. The results indicated that the interfacial properties of the blends were improved, with a maximum appearing at a critical concentration of the ionomer (7.5 vol %). At this level of compatibilization, SEM analysis revealed better interfacial adhesion and a finer dispersion. MFI results revealed a probable reaction between the amine groups of PA66 and the acid functions of the ionomer. The mechanical properties support the above results and showed that the addition of 25 wt % HDPE did not affect the properties of PA66 much and the presence of glass fiber did not hinder the effect of the compatibilizer. Only 20% decrease in notched Izod impact strength of the blends is observed at 7.5 vol % ionomer content, suggesting that the addition of 25 wt % of HDPE to PA66 is not detrimental at this level of compatibilization. The emulsification curve was established and revealed that, in terms of impact properties, the finer the particle size, the higher the impact strength corresponding to 7.5 vol % ionomer content. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 1748–1760, 2005 相似文献
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AS-g-MAH增容PC/ABS合金的研究及应用 总被引:1,自引:0,他引:1
研究了增容剂马来酸酐接枝(丙烯腈/苯乙烯)共聚物(AS-g-MAH)对PC/ABS合金加入玻璃纤维(GF)前后力学性能的影响,并采用扫描电子显微镜观察了PC/ABS合金加入增容剂及GF前后的微观结构。结果表明,AS-g-MAH的加入使PC/ABS合金的力学性能得到提高;微观形貌特征和力学性能试验结果完全相符。制得的增容改性PC/ABS合金可满足安全边界条和导向轮材料的要求。 相似文献