低吸水共聚聚酰胺树脂的制备及性能表征

选用4,4′-二氨基二环己基甲烷(PACM)和1,6-己二酸为原材料,首先成盐,然后用制备的PACM-6盐和己内酰胺按质量比进行高温缩聚,制备得到一系列低吸水共聚聚酰胺树脂。核磁共振氢谱和红外光谱测试结果表明PACM成功引入低吸水共聚聚酰胺树脂的分子链中;热性能分析测试结果表明随着PACM-6盐添加量的增加,低吸水共聚聚酰胺树脂的熔点逐渐降低而耐热性能逐步提升;万能试验机和水分测定仪测试结果表明随着共聚组分中PACM-6尼龙盐含量的逐步提升,低吸水共聚聚酰胺树脂的物理力学性能均呈现出逐步递增的变化趋势,另一方面,由于大量脂环结构的引入,可显著降低聚酰胺树脂分子主链上酰胺基的含量,从而使低吸水共聚聚酰胺树脂表现出低吸水率的特性。     

金属粘接用溶剂型封闭聚氨酯胶粘剂的制备及性能

采用二苯基甲烷-4,4'-二异氰酸酯(MDI)和聚己二酸-1,4-丁二醇酯二醇(PBA)合成了一系列的聚氨酯预聚物.以丁酮肟作为封闭剂,以异佛尔酮二胺(IPDA)和4,4'-二氨基二环己基甲烷(PACM)为扩链剂,以甲苯和乙酸乙酯混合溶液作为溶剂,制备了溶剂型封闭聚氨酯胶粘剂.对聚氨酯的合成、封闭和解封以及封闭聚氨酯固...     

含烷基取代基柔性聚酰亚胺薄膜的制备

以柔性二胺单体1,3-双(4-氨基苯氧基)苯(134BAPB)和含支链二胺单体3,3′-二乙基-4,4′-二氨基二苯甲烷(DEMMD)与3,3′,4,4′-二苯酮四酸二酐(BTDA)进行三元共聚,制备了一系列聚酰亚胺(PI)薄膜。通过傅里叶红外光谱、差示扫描量热仪、热重分析仪、热机械分析仪及电子万能材料试验机对材料的结构、热性能和力学性能进行了表征。结果表明PI薄膜已经成功制备,热性能与力学性能良好。     

冰浴法制备浅色透明聚酰亚胺薄膜

采用冰浴法,以二胺单体1,4-苯二甲胺(P-XDA)与二酐单体4,4'-氧双邻苯二甲酸酐(ODPA)、3,3',4,4'-二苯甲酮四甲酸二酐(BTDA)合成了两种聚酰亚胺(PI)薄膜.在二元聚合的基础上,引入脂环二胺4,4'-二氨基二环己基甲烷(PACM)进行三元聚合得到两种PI薄膜.通过红外光谱、紫外可见光谱、热机械...     

二胺固化剂对无溶剂封闭型聚氨酯树脂性能的影响

以聚氧化丙烯多元醇(PPG-2000/PPG-3000)、甲苯二异氰酸酯(TDI-80)及丁酮肟(MEKO)为原料合成无溶剂封闭型聚氨酯树脂。以液体二元胺为固化剂,研究了3,3'-二甲基-4,4'-二氨基二环己基甲烷(DMDC)、4,4'-二氨基二环己基甲烷(PACM)和异佛尔酮二胺(IPDA)对固化物性能的影响。热失重分析(TGA)表明,封闭型聚氨酯/固化剂165℃以下可实现解封与固化反应。氨基与NCO基摩尔比为1∶1时,封闭型聚氨酯树脂/DMDC固化物的模量及强度最高,封闭型聚氨酯树脂/IPDA固化物的模量最低。     

脂环二胺浅色透明聚酰亚胺薄膜的制备及性能表征

采用二步法,在冰浴的条件下,以含脂环结构的二胺单体5-氨基-1,3,3-三甲基环己甲胺(IPDA)和4,4′-二氨基二环己基甲烷(PACM)与二酐单体4,4′-(4,4′-异丙基二苯氧基)双(邻苯二甲酸酐)(BPADA),制备六种不同二胺比例的聚酰亚胺(PI)薄膜。通过红外光谱、X射线衍射(XRD)分析、紫外可见光谱、热机械分析、差示扫描量热(DSC)测试、热失重测试和力学性能测试对薄膜进行表征分析。结果表明,PI薄膜已经完全亚胺化,整体为无定型形态,在可见光范围内具有较高的紫外透过率,最大透过率均在87%以上,450 nm最高透过率为83.26%,力学性能表现出柔性,玻璃化转变温度(T_g)均在200℃左右,初始分解温度均在388℃以上,在未到初始分解温度之前,几乎不发生质量损失,热稳定性良好。     

硫脲改性胺环氧树脂固化剂的合成及性能研究

对硫脲改性胺(3,3′-二乙基4,4′-二氨基二苯基甲烷和二元脂肪胺A)固化剂固化环氧树脂进行了系统研究,分析了合成反应时间、反应温度和单体配料比对固化剂性能的影响,并进一步考察了固化剂与环氧树脂的最佳掺量比以及固化产物的热性能和力学性能。实验结果表明:反应时间为2.5 h,反应温度为130℃,3,3′-二乙基4,4′-二氨基二苯基甲烷与硫脲和二元脂肪胺A的物质的量比为1∶0.5∶0.4时,合成的固化剂以1∶3加入环氧树脂中,体系能在室温环境下1 h左右凝胶,该体系经室温固化再以100℃的温度后固化之后具有较好的耐热性能和冲击韧性。     

松节油基水性聚酯树脂分散体的合成及涂膜性能研究

以松节油-马来酸酐(TMA)、邻苯二甲酸酐(PA)、间苯二甲酸(IPA)、己二酸(AD)、新戊二醇(NPG)、三羟甲基丙烷(TMP)为原料,以2,2-二羟甲基丙酸(DMPA)为亲水性单体,合成了松节油基水性聚酯树脂分散体,并与氨基树脂(HMMM)配制成水性聚酯氨基漆。研究了DMPA用量及TMA与PA的物质的量比对松节油基水性聚酯树脂分散体及固化涂膜性能的影响。结果表明,当DMPA用量(以单体总质量计)为13%时松节油基水性聚酯树脂分散体性能较好,n(TMA)∶n(PA)=2∶1时,涂膜综合性能较好且达到溶剂型氨基漆技术指标。     

H_(12)MDI制备及其在聚氨酯中的应用进展

综述了4,4'–二环己基甲烷二异氰酸酯(H_(12)MDI)的制备方法,重点阐述了由4,4'–二氨基二苯基甲烷(MDA)经液相催化加氢制备H_(12)MDI前驱体4,4'–二氨基二环己基甲烷(H_(12)MDA)技术和H_(12)MDI在聚氨酯弹性体、涂料、膜分离材料等方面应用情况。     

高硬度透明聚氨酯弹性体的合成与性能研究

采用相分子质量为600的聚己二酸-1,4-丁二醇酯二元醇(PBA)、4,4-二环己基甲烷二异氰酸酯(H_(12)MDI)、三羟甲基丙烷(TMP)和脱色3,3′-二氯-4,4′-二氨基二苯甲烷合成了高硬度透明聚氨酯弹性体。结果表明,本研究合成的高硬度透明聚氨酯弹性体拉伸强度高、伸长率大、透光率高、抗冲击性能好。     

Structure–property relationship in polybutadiene–polyamide multiblock copolymers

Two kinds of aromatic–aliphatic polyamide oligomers were newly prepared by the reactant pairs of 3,4′-oxydianiline–adipic acid and 3,4′-oxydianiline–azelaic acid. These oligomers were then condensed separately with α, ω-polybutadienedicarboxylic acid giving two series of polybutadiene–polyamide multiblock copolymers. Properties of four series of polybutadiene–polyamide multiblock copolymers, whose polyamide blocks consisted of not only newly prepared polyamides but also previously synthesized aromatic polyamides derived from 4,4′-oxydianiline–isophthalic acid and 3,4′-oxydianiline–isophthalic acid, were investigated on the view point of structure-property relationship. A larger extent of the T_g depression of polybutadiene phase, and higher tensile strength and modulus were observed in the block copolymers having aromatic polyamides compared with those having aliphatic ones.     

Film studies of certain new aromatic–aliphatic polyamides

Two new aromatic–aliphatic polyamides containing azo linkage in the main chain based on 2,2′‐dimethyl‐4,4′‐diaminoazobenzene and adipic/2‐chloro‐5‐methyl‐1,2‐dioic acid (α‐chloro‐δ‐methyl adipic acid) were synthesized and analyzed by thermogravimetry and films were cast. Also three polymers obtained from condensation of 4,4′‐azodibenzoic acid/adipic acid and 2,2′‐bis [4‐(p‐amino phenoxy) phenyl] propane/4,4′‐diaminoazobenzene were studied in terms of mechanical and morphological properties. Film studies were carried out interms of tensile property, scanning electron microscope, dielectric, microwave, and X‐ray diffraction pattern. Thermal studies have been done using thermogravimetric analysis, differential thermal analysis, and pyrolysis‐mass spectral data. The results were correlated with structure and orientation of the molecules. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 1305–1316, 2004     

从己二酸副产物中分离提纯戊二酸的技术研究

混合二羧酸是己二酸装置的副产物,其中含有的戊二酸是一种重要的化工原料,应用广泛。本文通过对二羧酸分离方法的研究,从中选择合适的工艺条件,得到最终产品纯度达到预定目标,为有效利用己二酸的副产物指明了方向,并开创了戊二酸提纯的新方法。     

低相对分子质量PA6的制备

以己内酰胺、ω-氨基己酸、已二酸为原料合成了低相对分子质量(-Mn)PA6;研究了反应时间、己二酸用量对PA6试样-Mn的影响,并对PA6试样进行差示扫描量热及红外光谱分析.结果表明:在常压250℃条件下,反应时间12 h,己二酸质量分数(相对己内酰胺)为15％,可制备-Mn约2000,相对粘度1.2,端胺基含量小于1...     

A synthesized semi-aromatic copolyamaide through synergy of three different kinds of monomers: Toward high transparency,excellent heat resistance and melt flowing property

To fabricate the low-cost transparent polyamide with high heat resistance and good melt flowing property simultaneously is a huge challenge in many high-end fields due to the contradiction between these two properties. In order to balance this contradiction, in this paper, by using isophthalic acid (IPA, aromatic monomer), 4,4′-methylenebis(cyclohexylamine) (PACM, alicyclic monomer) as rigid stereoscopic monomers, 1,6-hexanediamine (HMD, aliphatic monomer) as the flexible monomer, a series of transparent poly(hexamethylene isophthalamide/poly(m-benzoyl4,4′-methylenebis(cyclohexylamine)) (PA6I/PACMI) with rigid and stereoscopic structure (corresponding to the large distance between adjacent molecular chains) were successfully synthesized. The results indicated that the newly synthesized PA6I/PACMI copolymer has an intrinsically amorphous structure and high optical transparency, which could reach as high as 90%. Furthermore, the highest glass transition temperature (T_g) of the copolymer is over 153.9°C, at the same time, the copolymer also possesses excellent melt flowing property, which can be melt processed easily. Therefore, the newly synthesized copolymer has great advantages in many fields, and it can also shed light on the design and fabrication of high-performance materials.     

Copolyamides derived from brassylic acid

Polyamides were prepared from C₆ to C₁₂ diamines with brassylic acid, a linear C₁₃ dicarboxylic acid, derived from Crambe seed oil. One distinct characteristic of these polymers is their low moisture adsorption as compared to nylon 66 and nylon 6. To modify the properties of these nylons, multi-component copolyamides were prepared from hexamethylene diamine and mixtures of brassylic acid with adipic, terephthalic, or isophthalic acids. It was found that the melting points of the co-polyamides were changed by the choice and the levels of the diacids used. The melting point-composition curves all show a eutectic minimum. The glass transition temperature of nylon 6,13 is also changed by the incorporation of other diacids. Water adsorption of nylon 6,13 increases with increased substitution of brassylic acid by other diacids in the order of adipic > isophthalic ≥ terephthalic. Mechanical properties of some copolyamides are in the same range as the commercial nylon 11 and nylon 12. The low moisture absorption, reduced fabrication temperature, and the wide range of properties obtainable through copolymerization make copolyamides derived from brassylic acid potentially suitable as specialty tubing, powder coatings, and molded machine parts. They will be commercially viable when brassylic acid becomes available on a large scale and is competitively priced.     

Preparation of dibasic acid-containing soy phospholipids by chemical and enzyme-catalyzed transesterification and evaluation of their surface-active properties

The preparation of dibasic acid-containing soy phospholipid was made by transesterification reaction with alkyl ester of diabasic acid with both lipase and alkoxide as a catalyst. The extent of incorporation of a dibasic acid varied with the molecular size of the dibasic acid. The extent of incorporation in soy phospholipids was 4–13% in the case of adipic acid and 9–20% in the case of sebacic acid. The surface-active properties of these modified soy phospholipids were examined and were found to be different from those of the original (unmodified) soy phospholipid. The interfacial properties such as critical micelle concentration (CMC), γ_CMC, surface excess concentration Γ_max, and minimum area per molecule (Å), and thermodynamic parameters such as standard free energy of micellization, were found to depend on the hydrophobic part of the dibasic acids.     

生物基聚己二酸戊二胺聚合物结构及高速纺长丝性能

生物基聚己二酸戊二胺(聚酰胺56)是由生物基戊二胺和石油基己二酸聚合而成,通过核磁共振、红外光谱、元素分析表征了生物基聚酰胺56的结构,通过差示扫描量热分析、热重分析研究了生物基聚酰胺56的热性能,采用高速纺丝、拉伸两步法进行纺丝试验,并测试了其物理性能。与现有石油基聚酰胺66、聚酰胺6的性能相比,生物基聚酰胺56可纺性良好,纤维的力学性能较好,亲水性能优于聚酰胺6和聚酰胺66,是一种具有广泛应用前景的生物质纤维材料。     

戊二酸分离纯化研究进展

戊二酸是重要的五个碳原子的二元羧酸,混合二元羧酸是己二酸工业生产中的副产物,其中含有的戊二酸是一种重要的化工原料,应用广泛。因此从混合二元酸中分离纯化戊二酸的方法受到研究者的重视,本文综述了戊二酸分离纯化的研究进展。     

Use of functionalized boehmite nanoparticles to improve the hardness and tribological properties of polyurethane films

Plate-like boehmite nanoparticles (BH) produced from aluminum hydroxide by hydrothermal process were functionalized in one step with two different diisocyanates. The amount of free isocyanates that were available for polymerization reaction was determined to be higher in functionalization with the aromatic diisocyanate (diphenylmethane-4,4′-di-isocyanate – MDI). In composite film production MDI functionalized BH (MDI-BH) was used. Polyurethane based nanocomposite films were produced through polymerization of non-functionalized and MDI-BH with two different polyester-polyols that were synthesized by the esterification of 1,4 butanediol with either adipic acid or phthalic anhydride. It was impossible to form films suitable for hardness and tribological tests with non-functionalized BH. Up to 1 wt% MDI-BH additions were effective in increasing the hardness and scratch resistance of films. The increases in abrasion resistance were more significant and followed the increasing trend for MDI-BH additions even up to 5 wt%. The highest increase, which was 400% with respect to the unmodified resin was observed with adipic acid based polyols and this result was obtained at MDI-BH content of 3 wt%.