共查询到20条相似文献,搜索用时 31 毫秒
1.
PA66/PA1010共混物的研究 总被引:1,自引:0,他引:1
周文 《现代塑料加工应用》1993,5(3):10-12
研究了以硅烷类化合物为偶联剂的PA66/PA1010共混物。试验结果表明:PA66和PA1010具有很好的相容性,偶联剂用量在0.5%~0.7%时效果最佳;采用5%~10%PA1010与PA66共混可获得较高的机械性能。 相似文献
2.
PP/PA6共混物的形态和流变性能 总被引:4,自引:0,他引:4
将聚丙烯(PP)和聚酰胺6(PA6)共混可以使PP和PA6在性能上互补,所得共混物性价比很高。本文分析了PP/PA6共混物在共混时相容性和流变,性对其形态的影响。列举了目前PP/PA6增容剂的研究情况,二相相容时的简单动力学模型,以及分散相PA的含量、增容剂的种类、双螺杆挤出机熔融段的螺杆结构、螺杆转速、共混方式等影响PP/PA6共混物形态的因素。 相似文献
3.
以聚丙烯接枝马来酸酐(PP-g-MAH)为相容剂,制备了聚丙烯(PP)/乙烯-乙烯醇共聚物(EVOH/)聚酰胺6(PA6)共混物,研究了PP/EVOH/PA6三元共混物的相容性、流变性能、阻隔性能、力学性能、热性能及形态结构。结果表明:相容剂与EVOH和PA6间发生了反应,提高了共混物的相容性;相容剂的加入提高了PP、EVOH、PA6的结晶温度,增强了PP与EVOH和PA6间的黏合力,降低了界面张力;EVOH占EVOH/PA6总量68%的三元共混物吸油率最小,当相容剂用量为5份时,PP/EVOH/PA6三元共混物吸油率比PP/EVOH二元共混物降低了8%。 相似文献
4.
从流变曲线、背散射光斑的积分强度、Debye—Bueche理论计算的相关距离和电子显微镜对PP/PA1010(90/10,体积比)共混体系的微观形态发展进行了讨论。结果表明,这一体系在共混初期(即1min以前)形态有较大变化,在共混1min以后,共混物的形态趋于稳态。 相似文献
5.
LDPE接枝马来酸锌离聚物对PP/PA6共混体系相容性的影响 总被引:6,自引:1,他引:6
采用SEM和动态粘弹谱研究了不同接枝率的LDPE接枝马来酸锌离聚物(LDPE-g-MAZn)对PP/PA6共混体系相容性的影响。LDPE-g-MAZn采用熔融法合成,所制样品接枝率分别为1.5%(质量,下同)、4.5%和5.4%。研究结果表明,LDPE-g-MAZn能有效地改善PP/PA6共混物的相容性,其相容性随离聚物接枝率的提高而增强。在PP(90)/PA(10)体系中,加入离聚物后分散相(PA6)更均匀、粒子尺寸更小,而且随着离聚物接枝率的提高,PA6颗粒的粒径就越小,分散越匀;在PP(50)/PA(50)的体系中,离聚物的加入使两相互相贯穿,在动态粘弹谱上表现出Tg相互靠近,熔断温度有所提高。 相似文献
6.
通过扫描电镜(SEM)、差示扫描量热法(DSC)、傅立叶红外光谱(FTIR)研究了离聚物Surlyn对PTT/PA6共混物的相容性及形态结构的影响。PTT和PA6共混体系为热力学不相容体系,在共混物中加入一种离聚物聚甲基乙基丙烯酸锌(Surlyn),以提高共混物的相容性。实验结果表明,在以PTT为主体的PET/PA6简单共混物中,两者的相容性很差。加入离聚体Surlyn后,增加了界面粘接力,使分散相PA6的尺寸减小、分布趋向均匀。随着Surlyn的加入,PTT/PA/Surlyn共混体系的相容性得到了一定的提高。 相似文献
7.
在PA11/PA6共混物中添加4.0代树形分子,提高了共混物的性能,研究了不同树形分子含量对共混物力学性能、耐热性和流动性的影响。结果表明,在PA11/PA6中添加0.25%树形分子后,共混物的拉伸强度、断裂伸长率明显提高,缺口冲击强度和维卡软件温度略有增加,但流动性有所下降。 相似文献
8.
采用熔体共混的方法制备了聚酰胺11/聚酰胺1010(PA11/PA1010)共混物,通过力学性能和差示扫描量热(DSC)测试,研究了PA11/PA1010共混物的力学与结晶性能。测试结果表明:PA1010对PA11同时具有增韧、增强作用;当PA11/PA1010为70/30时,共混物开始出现两个结晶峰和低温熔融峰;共混物的结晶和熔融以PA11为主,兼具有PA11和PA1010的优良性能;断裂伸长率、拉伸强度与缺口冲击强度均达到极大值。 相似文献
9.
离聚物surlyn对PET/PA66共混物性能的影响 总被引:1,自引:0,他引:1
张静旖;丁永红;俞强;唐丽军;张艳 《中国塑料》2011,25(11):22-26
摘要:采用傅里叶红外光谱、示差扫描量热法(DSC)考察了离聚物surlyn对PET/PA66共混体系结构、结晶性能的影响;通过低剪切速率下流变性能测试、力学性能测试以及热变形温度测试,考察了离聚物对该体系流变性能、力学性能、耐热性能的影响。实验结果表明:加入离聚物Surlyn增加了界面的粘接力和分子间的链缠结,使共混体系的相容性得到了提高,其中以离聚物Surlyn含量在10%效果较好。 相似文献
10.
11.
12.
Binary blends formed by two types of ethylene‐co‐vinyl acetate (EVA), which have different vinyl acetate contents, and poly(vinyl acetate) (PVAc) were prepared in a Haake Rheocord 9000 plastograph. A series of samples were obtained varying the PVAc amount up to 50%. The studies were carried out employing solid‐state nuclear magnetic resonance spectroscopy (NMR) and scanning electronic microscopy (SEM). The xenon‐129 (129Xe) and carbon‐13 (13C) NMR response together with the microscopy results showed that the systems are heterogeneous. Therefore, EVA with a higher vinyl acetate content presented some interaction between the polymer blend components. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 116–124, 2002 相似文献
13.
S. G. Adoor L. S. Manjeshwar K. S. V. Krishna Rao B. V. K. Naidu T. M. Aminabhavi 《应用聚合物科学杂志》2006,100(3):2415-2421
The blend miscibility of poly(vinyl alcohol) and poly(methyl methacrylate) in N,N′‐dimethylformamide solution was investigated by viscosity, density, ultrasonic velocity, refractive index, and UV and fluorescence spectra studies. Differential scanning calorimetry and scanning electron microscopy were used to confirm the blend miscibility in the solid state. Blends were compatible when the concentration of poly(vinyl alcohol) was greater than 60 wt %. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 2415–2421, 2006 相似文献
14.
The miscibility of blends of a polyarylate (PAr) with poly(trimethylene terephthalate) (PTT) was investigated in the whole composition range by DSC measurements. With the exception of the 90/10 composition, which was fully miscible, the blends showed partial miscibility, and contained a nearly pure PTT phase and a PAr‐rich phase with 18% PTT. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 1559–1561, 2004 相似文献
15.
On purpose to examine the effect of branch length on the miscibility of polyolefin blends, miscibility behavior of linear polyethylene/poly(ethylene‐co‐1‐octene) blend was studied and compared to that of linear polyethylene/poly(ethylene‐co‐1‐butene) blend. Miscibility of the blend was determined by observing the morphology quenched from the melt, and by using the relation between interaction parameter and copolymer composition. When the weight composition and molecular weight was the same, poly(ethylene‐co‐1‐octene) was slightly more miscible with linear polyethylene than poly(ethylene‐co‐1‐butene) was. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献
16.
The miscibility, crystallization behavior, and component interactions of two binary blends, poly(L ‐lactide) (L ‐PLA)/poly(vinylpyrrolidone) (PVP) and poly(D ,L ‐lactide) (DL ‐PLA)/PVP, were studied with differential scanning calorimetry and Fourier transform infrared (FTIR) spectroscopy. The composition‐dependent changes of the glass‐transition temperature (Tg) and degree of crystallinity (Xc) of the L ‐PLA phase indicated that L ‐PLA and PVP were immiscible over the composition range investigated. However, the sharp decrease of Xc with increasing PVP content in the second heating run demonstrated that the cold crystallization process of L ‐PLA was remarkably restricted by PVP. In DL ‐PLA/PVP blends, the existence of two series of isolated Tg's indicated that DL ‐PLA and PVP were phase‐separated, but evidence showed that there was some degree of interaction at the interface of the two phase, especially for the blends with low DL ‐PLA contents. FTIR measurements showed that there was no appreciable change in the spectra of L ‐PLA/PVP with respect to the coaddition of each component spectrum, implying the immiscibility of the two polymers. In contrast to L ‐PLA, the intermolecular interaction between DL ‐PLA and PVP was detected by FTIR; this was evidenced by the observation of a high‐frequency shift of the C?O stretching vibration band of PVP with increasing DL ‐PLA content, which suggested some degree of miscibility. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 973–979, 2003 相似文献
17.
Blends of synthetic poly(propylene carbonate) (PPC) with a natural bacterial copolymer of 3‐hydroxybutyrate with 3‐hydroxyvalerate (PHBV) containing 8 mol % 3‐hydroxyvalerate units were prepared with a simple casting procedure. PPC was thermally stabilized by end‐capping before use. The miscibility, morphology, and crystallization behavior of the blends were investigated by differential scanning calorimetry, polarized optical microscopy, wide‐angle X‐ray diffraction (WAXD), and small‐angle X‐ray scattering (SAXS). PHBV/PPC blends showed weak miscibility in the melt, but the miscibility was very low. The effect of PPC on the crystallization of PHBV was evident. The addition of PPC decreased the rate of spherulite growth of PHBV, and with increasing PPC content in the PHBV/PPC blends, the PHBV spherulites became more and more open. However, the crystalline structure of PHBV did not change with increasing PPC in the PHBV/PPC blends, as shown from WAXD analysis. The long period obtained from SAXS showed a small increase with the addition of PPC. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 4054–4060, 2003 相似文献
18.
Biopolyesters poly(3‐hydroxybutyrate‐co‐4‐hydroxybutyrate) with an 11 mol % 4HB content [P(3HB‐co‐11%‐4HB)] and a 33 mol % 4HB content [P(3HB‐co‐33%‐4HB)] were blended by a solvent‐casting method. The thermal properties were investigated with differential scanning calorimetry. The single glass‐transition temperature of the blends revealed that the two components were miscible when the content of P(3HB‐co‐33%‐4HB) was less than 30% or more than 70 wt %. The blends, however, were immiscible when the P(3HB‐co‐33%‐4HB) content was between 30 and 70%. The miscibility of the blends was also confirmed by scanning electron microscopy morphology observation. In the crystallite structure study, X‐ray diffraction patterns demonstrated that the crystallites of the blends were mainly from poly(3‐hydroxybutyrate) units. With the addition of P(3HB‐co‐33%‐4HB), larger crystallites with lower crystallization degrees were induced. Isothermal crystallization was used to analyze the melting crystallization kinetics. The Avrami exponent was kept around 2; this indicated that the crystallization mode was not affected by the blending. The equilibrium melting temperature decreased from 144 to 140°C for the 80/20 and 70/30 blends P(3HB‐co‐11%‐4HB)/P(3HB‐co‐33%‐4HB). This hinted that the crystallization tendency decreased with a higher P(3HB‐co‐33%‐4HB) content. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
19.
Franoise Fenouillot Claire Hedreul John Forsythe Jean‐Pierre Pascault 《应用聚合物科学杂志》2003,87(12):1995-2003
Poly(ethylene terephthalate) (PET) was melt‐blended at 270°C with two epoxy monomers, diglycidyl ether of bisphenol A (DGEBA) and 3,4‐epoxycyclohexyl‐methyl‐3,4‐epoxycyclohexyl carboxylate (ECY). Intermediate proportions of the epoxy in the range of 20–0.5 wt % were used. If the epoxy monomers were added in a high proportion (10–20%), a large fraction did not react with PET. Calorimetric experiments showed that the unreacted fractions of both epoxies were miscible with the amorphous phase of the polyester. Only one glass‐transition temperature was detected. It was depressed as the epoxy content was increased. The transition was broad when the PET component was crystalline, and it was narrow when the PET component was made amorphous by quenching of the blend. These features were confirmed by dynamic thermal mechanical analysis. As is often the case for crystalline blends, the crystallization and melting temperatures decreased when the proportion of the epoxy was increased. Concerning the reactivity of the epoxy with PET, the behavior differed according to the nature of the epoxy. The DGEBA monomer showed a low reactivity. It was not effective for the chain extension of PET, and no increase in the intrinsic viscosity was observed under the experimental conditions. However, some functionalization of the chain ends may be possible at a high concentration of the epoxy. ECY was more reactive, and the molecular weight of the processed PET increased, although the value of the commercial untreated polyester was not attained. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 87: 1995–2003, 2003 相似文献
20.
The hydrogen bonding, miscibility, crystallization, and thermal stability of poly(3‐hydroxybutyrate) (PHB)/4‐tert‐butylphenol (BOH) blends and poly(3‐hydroxybutyrate‐co‐3‐hydroxyhexanoate) [P(3HB‐3HHx)]/BOH blends were investigated by Fourier transform infrared (FTIR) spectroscopy, solid‐state13C‐NMR, differential scanning calorimetry, wide‐angle X‐ray diffraction (WAXD), and thermogravimetric analysis. The results of FTIR spectroscopy and solid‐state13C‐NMR show that intermolecular hydrogen bonds existed between the two components in the blends and that the interaction was caused by the carbonyl groups in the amorphous phase of both polyesters and the hydroxyl groups of BOH. With increasing BOH content, the chain mobility of both the PHB and P(3HB‐3HHx) components was improved. After the samples were quenched, the detected single glass‐transition temperatures decreased with composition, indicating that both PHB/BOH and P(3HB‐3HHx)/BOH were miscible blends in the melt. Moreover, as BOH content increased, the melting temperatures of PHB and P(3HB‐3HHx) clearly decreased, which implied that their crystallization was suppressed by the addition of BOH. Although the crystallinity of PHB and P(3HB‐3HHx) components decreased with increasing BOH content in the blends, their crystal structures were hardly affected after they were blended with BOH, which was further proven by WAXD results. In addition, the thermal stability of PHB was improved by a smaller amount of BOH. 相似文献