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1.
聚甲亚胺/尼龙6原位聚合材料的合成与表征   总被引:4,自引:0,他引:4  
利用原位聚合方法制备了聚甲亚胺(PAM)/尼龙6(PA6)材料,并对其结构和热性能进行了表征。红外光谱、紫外光谱分析表明了刚性链高分子PAM在PA6中已经生成。DSC和TGA热分析结果表明,PAM的加入对PA6的结晶起了诱导结晶作用,但没有改变铸型尼龙的α晶型结构,结晶形态仍为球晶结构;PAM/PA 6(5%)材料的动态力学谱图上,只出现了一个玻璃化转变温度,较PA6的提高了5℃。  相似文献   

2.
根据碱催化阴离子聚合原理制备了单体浇铸(MC)尼龙6(PA6)、长碳纤维增强尼龙6(PA6/CL)复合材料和三维编织碳纤维增强尼龙6(PA6/C3D)复合材料,分析了工艺影响因素,并通过动态热机械分析仪对材料的热机械性能进行了研究。结果表明,PA6/C3D复合材料比PA6的热强度高4.37倍,而玻璃化转变温度却基本未发生变化,PA6/C3D复合材料的综合性能优于PA6/CL复合材料。  相似文献   

3.
采用原位乳液聚合法制备了聚甲基丙烯酸甲酯(PMMA)/三聚氰胺氰尿酸盐(MC)复合胶粒,对其进行X光电子能谱及热重分析结果显示,在MC阻燃剂颗粒表面覆盖了一层PMMA胶膜,形成了具有核-壳结构的PMMA/MC复合胶粒;MC能影响PMMA的热降解过程并促进其成炭;在尼龙6(PA6)中的应用结果表明,PMMA/MC复合胶粒能改善PA6的力学性能和阻燃性能。  相似文献   

4.
GMA熔融接枝SBS及其对PA6增容研究   总被引:4,自引:0,他引:4  
采用活性单体甲基丙烯酸缩水甘油酯(GMA)对(苯乙烯/丁二烯/苯乙烯)嵌段共聚物(SBS)进行熔融接枝,制备了GMA接枝SBS(SBS-g-GMA)。用化学滴定方法测定其接枝率,考察了单体GMA和引发剂过氧化二异丙苯的用量对接枝率的影响;测试了尼龙6(PA6)/SBS-g-GMA共混物的拉伸性能和冲击性能,并用扫描电子显微镜观察了PA6/SBS-g-GMA共混物的形态结构。结果表明,用SBS-g-GMA增韧PA6可获得很好的效果。  相似文献   

5.
尼龙6是机械性能优异的热塑性结晶工程塑料,具有很好的强度、耐磨性能优异,成型性好,因而广泛用于高分子合金的制造。本文研究刚性链聚合物—酞侧基聚醚砜(PES-C)增强尼龙6,采用熔融共混的方法获得一系列PES-C/PA6共混物,使用DSC、TG、SEM等方法对其结构与性能进行表征,结果表明:PES-C的加入对尼龙的结晶产生异相成核的作用,使结晶温度升高,同时也小幅度提高了PA6的玻璃化转变温度。  相似文献   

6.
PPS/PA6合金的研究   总被引:1,自引:0,他引:1  
为了改善聚苯硫醚(PPS)的性能,降低应用成本,制备了一系列不同组成的PPS/尼龙6(PA6)合金,通过热失重分析,拉伸性能、冲击性能测试及扫描电子显微镜观察等研究了合金的热行为、力学性能及微观形态:结果表明,PPS/PA6合金具有良好的耐热性能,PPS和PA6有较好的相容性,PA6的加入可以改善PPS的力学性能。  相似文献   

7.
抗静电尼龙6/氧化锌晶须复合材料结构及性能研究   总被引:8,自引:0,他引:8  
用熔融共混法制备出尼龙6(PA6)/氧化锌晶须(ZnOw)复合材料,测试了PA6/ZnOw复合材料的电性能和力学性能,分析了影响机理,并借助傅立叶转换红外光谱(FT-IR)对复合材料的结构进行了表征。结果表明,随着ZnOw用量的增加,复合材料的表面电阻率和体积电阻率明显下降,下降幅度达到4个数量级;拉伸强度和硬度有所降低,而冲击强度出现先升后降的趋势。红外谱图显示,表面经处理过的ZnOw与尼龙基体发生了相互作用。  相似文献   

8.
通过熔融共混法制备了不同配比的尼龙6(PA6)/磷酸三苯酯(TPP)/三聚氰胺氰尿酸盐(MCA)粒料,采用垂直水平燃烧仪、万能材料试验机、摆锤冲击试验机,研究了阻燃 PA6粒料的组成对其阻燃和力学性能的影响。通过熔融纺丝技术证明了 PA6阻燃粒料的可纺性,研究了材料组成对其纺丝性能的影响。使用纤维强伸度仪、热重分析仪研究了 PA6纤维的组成对纤维力学性能和热性能的影响与规律。研究结果表明,TPP 含量的增加能够提高阻燃PA6粒料的阻燃等级,并且当 PA6∶MCA∶TPP 质量比为90∶9∶0.3时,PA6具有较好的阻燃和力学性能。  相似文献   

9.
制备了尼龙6(PA6)/马来酸酐接枝乙烯—辛烯共聚物弹性体(POE—g—MAH)/纳米CaCO3复合材料。SEM分析表明,部分CaCO3粒子均匀分散在尼龙基质中,部分纳米CaCO3粒子为POE—g—MAH所包覆而形成了“壳—核”结构。随着基体中纳米CaCO3的增加,PA6/纳米CaCO3/POE—g—MAH发生脆韧转变所需要的弹性体量增加;在韧性断裂时,纳米CaCO3和POE—g—MAH对PA6的增韧有显著的协同作用。  相似文献   

10.
尼龙增强膨胀型阻燃PP的研究   总被引:5,自引:0,他引:5  
马志领  张伟燕 《塑料工业》2005,33(1):58-59,63
用尼龙6(PA6)代替部分季戊四醇(PT)作成炭剂,制得了膨胀型阻燃聚丙烯(IFR-PP),讨论了PA6对IFR-PP的力学性能、阻燃性能、热稳定性和流变行为的影响。结果表明:PA6的加入提高了IFR-PP的表观粘度、力学性能和热稳定性。PA6的用量为3%时,IFR-PP的拉伸强度提高了24.2%,分解温度提高了18℃;同时阻燃性能保持不变,且具有良好的加工性能。  相似文献   

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Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively. There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized. High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing, and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually preserves suspension stability during freezing. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago, IL. Tied for first place in The John A. Gordon Best Paper Competition.  相似文献   

13.
In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures (release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species (Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles from the southeastern region of the US.  相似文献   

14.
A highly moisture-proof polysilsesquioxane coating was obtained from a new bis-silylated precursor, which was synthesized from 3-aminopropyltriethoxysilane (APTES) and m-xylylene diisocyanate (m-XDI) in tetrahydrofuran (THF) and verified by 1H MAS NMR. For direct comparison purposes, an SiO2 coating was also prepared by the Stöber method using tetraethoxysilane (TEOS) as the reactant. Interestingly, the coating obtained from the polysilsesquioxane sol exhibited a much higher moisture resistance capability than its counterpart, which was attributed to its more compact feature between nanoparticles as characterized by N2 absorption experiment and transmission electron microscopy (TEM). Furthermore, its high transparency of about 92% showed potential for application in the protection of optical crystals.  相似文献   

15.
Glycidyl carbamate chemistry combines the excellent properties of polyurethanes with the crosslinking chemistry of epoxy resins. Glycidyl carbamate functional oligomers were synthesized by the reaction of polyfunctional isocyanate oligomers and glycidol. The oligomers were formulated into coatings with several amine functional crosslinkers at varying stoichiometric ratios and cured at different temperatures. Properties such as solvent resistance, hardness, and impact resistance were dependent on the composition and cure conditions. Most coatings had an excellent combination of properties. Studies were carried out to determine the kinetics of the curing reaction of the glycidyl carbamate functional oligomers with multifunctional and model amines. Detailed kinetic analysis of the curing reactions was also undertaken. The results indicated that the glycidyl carbamate functional group is more reactive than a glycidyl ether group. Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, on October 27–29, 2004, in Chicago, IL.  相似文献   

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Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.  相似文献   

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