不同软链段对水性聚氨酯性能的影响

以低聚物多元醇、IPDI(异佛尔酮二异氰酸酯)、亲水扩链剂DMPA(2,2-二羟甲基丙酸)和成盐剂三乙胺为主要原料,合成一组软段成分不同的水性聚氨酯乳液。通过测定水性聚氨酯乳液的固含、黏度、结构,以及水性聚氨酯胶膜的耐水性、力学性能、T型剥离强度等,对比了不同类型软段对乳液及胶膜性能的影响。研究结果表明:由含6个碳的聚酯多元醇为软段合成的水性聚氨酯的黏度、耐水性、机械强度、T型剥离强度等数据较好。     

软段对水性聚氨酯木器涂料性能的影响

合成了系列水性聚氨酯乳液,研究了低聚物多元醇种类及分子量不同对水性聚氨酯涂料性能的影响。结果表明:聚酯型水性聚氨酯随着软段分子量的增大结晶程度增加,机械强度和硬度较聚醚型高,耐水性较好;结构规整,易结晶的软段合成出的聚氨酯树脂力学性能和耐水性能都较好;而有机硅氧烷改性可以提高聚氨酯材料的耐水性。     

软段含离子基团的阴离子型水性聚氨酯胶粘剂的研究——Ⅰ软段结构的影响

本文以含有不同离子基团的聚酯多元醇为软段,采用丙酮法合成了一系列水性聚氨酯乳液。研究了不同离子基团的聚酯多元醇和不同软段结构对其干膜物理机械性能和吸水率的影响。     

软段含离子基团的阴离子型水性聚氨酯胶粘剂的研究(Ⅰ)——软段结构的影响

以含有不同离子基团的聚酯多元醇为软段,采用丙酮法合成了一系列水性聚氨酯乳液。研究了不同离子基团的聚酯多元醇和不同软段结构对其干膜物理机械性能和吸水率的影响。     

氨基硅油微乳液改性水性聚氨酯的合成和性能

合成了水性聚氨酯乳液和氨基硅油(AEAPS)微乳液改性水性聚氨酯乳液,研究了两种水性聚氨酯的性能及在织物上的涂层效果。结果表明,当氨基硅油相对于聚丙二醇的质量百分比为8.18%时,有机硅改性水性聚氨酯乳液的离心稳定性好,乳液胶膜表面硅原子的质量分数为0.92%;该有机硅改性水性聚氨酯软段相与硬段相的微观相分离增大,乳液胶膜的耐水性能和热稳定性提高;该有机硅改性水性聚氨酯乳液作为织物涂层剂时,可以赋予织物柔软、滑爽的风格。     

水性聚氨酯胶粘剂的结晶性研究

以高结晶性聚酯多元醇为软段,采用丙酮法合成了一系列水性聚氨酯乳液(WPU)。通过DSC等分析手段研究了多元醇结构、分子质量和多元醇与含离子基化合物不同比例对胶粘剂的结晶性、初粘性、吸水性以及胶膜力学性能的影响。     

软段含离子的水性聚氨酯的合成与表征

以二羟甲基丙酸为起始剂,由己内酯开环聚合合成了含羧基的聚己内酯二醇,并以此为软段,探索合成了软段合离子的水性聚氨酯,并进行了初步研究。该水性聚氨酯具有良好的稳定性及胶膜强度。     

磺酸型水性聚氨酯的研究进展

综述了磺酸型水性聚氨酯乳液SWPU的制备、性能以及国内外研究进展。介绍了其应用领域和国内外应用情况,并对SWPU的发展及应用前景进行展望。()     

丙烯酸酯改性水性聚氨酯的研究进展

介绍了丙烯酸酯改性水性聚氨酯乳液(PUA)的制备方法,其中包括乳液型丙烯酸酯改性水性聚氨酯、单体丙烯酸酯改性水性聚氨酯、溶剂型丙烯酸酯低聚物改性水性聚氨酯,指出了各改性方法的优缺点;概述了国内外的研究现状,对丙烯酸酯改性水性聚氨酯前景进行了展望。     

己二酸系聚酯型水性聚氨酯胶黏剂的制备及性能研究

以己二酸系列聚酯二元醇为软段,合成了稳定的水性聚氨酯乳液,探讨了聚酯二元醇的分子量、链段长度及支链结构对于水性聚氨酯粒径、吸水率、力学性能、T-型剥离强度、热学性能的影响。结果表明,随着聚酯二元醇分子量的增加,乳液粒径先降低后增大,耐水性能、力学性能、T-型剥离强度、硬度及耐热性均逐渐提高,当PBA分子量为4 000时,拉伸强度及T-型剥离强度最优,分别可达28.6 MPa和26.8 N/cm;聚酯的链段结构越长,支链结构越少,耐水性能、力学性能及粘接性能越好,其中PHA为软段制备的水性聚氨酯综合性能最优,拉伸强度可达26.3 MPa,T-型剥离强度可达26.1 N/cm。     

高固含量水性聚氨酯的合成及其成膜性能的研究

采用预聚体分散法制备出50%以上固含量的水性聚氨酯,考察了软链段分子链长及硬链段含量对聚氨酯相分离行为、热性能及力学性能等的影响。研究表明:硬链段含量、软链段链长的提高和离子基团的增加均有利于拉伸强度的提高。     

Synthesis and characterization of high solid content aqueous polyurethane dispersion

Aqueous polyurethane (APU) dispersions having a solid content of 50% were synthesized using dimethyol propionic acid (DMPA) as the stabilizing moiety. The principal diols used were poly‐1,4‐butylene adipate glycol (PBA). The diisocyanates used in this study were a 30:70 blend of hexamethylene diisocyanate (HDI) and isophorone diisocyanate (IPDI). All these samples were neutralized using triethylamine (TEA) and chain‐extended using ethylene diamine (EDA). The effects of the COOH content, NCO/OH molar ratio, and molecular weight (M_n) of PBA on the properties of APU dispersion and its cast film were studied. Dynamic light scattering results revealed that these high solid content dispersions shown broad particle size distributions as well as bimodal. Differential scanning calorimetry (DSC) and dynamic mechanical thermal analysis (DMA) results showed that as the hard segment content increased, the melting point (T_m) of the APU cast film increased, but the glass transition temperature (T_g) did not show significant alteration, when a PBA lower than 1000 M_n was used, the APU exhibited faint soft‐segment crystallization and tended to form amorphous polymer. Tensile and T‐peel strength tests attained excellent mechanical properties, such as a maximum Young's modulus of 166 MPa and the elongation at break reached to 2000%. T‐peel strength test (PVC/PVC) yielded a maximum peel strength value of 8.8 N/mm. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

聚氨酯弹性体的动态力学性能的影响因素

综述了聚氨酯弹性体动态力学性能的多种影响因素,讨论了软段类型(聚酯和聚醚)、软段相对分子质量、硬段类型(二异氰酸酯和扩链剂)、硬软段质量分数对PU弹性体动态力学性能的影响。在PU弹性体中,聚酯软段比聚醚软段的Tg高,弹性模量依PPG、PEG、PTMG软段顺序增加。     

水性聚氨酯电导率与聚沉值的研究

研究了软（硬）段含羧基的水性阴离子纳米聚氨酯体系的n(NCO)/n(OH)比值，COOH的质量分类，反离子各类，合成方法与电导率关系及产生的原因；探讨了该体系的n(NCO)/n(OH)值，COOH的质量分数，合成方法与临界聚沉值（Cc.c)的关系和规律。并分析，比较了软（硬）段含羧基的水性阴离子聚氨酯体系电导率与Cc.c二者关系，得出了随COOH的质量分数升高，二者变化相同，随n(NCO)/n(OH)比值升高,二者变化相反的结论。     

Synthesis and properties of poly(acrylates-co-urethane) adhesives for low surface energy materials

The series of poly(acrylates-co-urethane) were synthesized based on the copolymerization between 2-hydroxyethyl acrylate terminated polyether (or polyester) urethane and acrylate monomers initiated by tri-n-butylborane (TBB). The effects of the soft segment of polyether (or polyester) urethane diacrylate on the copolymer properties were mainly discussed. Polyether (or polyester) urethane was relatively well dispersed in polyacrylate continuous phase, and was intended to aggregate with the increase of soft segment polarity and content. The adhesion to low surface energy materials and loss factor (tan δ) of copolymers were almost not influenced by the soft segment content, but decreased with the increase of soft segment polarity within the scope of the study. On the other hand, the working life of copolymers as adhesives was shortened with the increase of soft segment polarity, but prolonged with the increase of soft segment content. The copolymers with different structures of polyether (or polyester) urethane diacrylate were also shown to be good candidates as adhesives at room temperature.     

Dielectric properties of segmented polytetramethyleneoxide-based polyurethanes

Three series of segmented polyurethanes, based on polytetramethylene oxide (PTMO) soft segments, having molecular weights of 650, 1000, and 2000 and MDI/butane diol hard segments, were synthesized and their dielectric properties examined. The effect of the soft segment length, soft segment concentration (ssc) as structural variables, and frequency and temperature as experimental variables, on relative permittivity and tan δ, were examined. The results were discussed in terms of the structural parameters such as the degree of phase separation and soft segment phase state. It was found that both soft segment length and ssc strongly affect dielectric behavior.     

聚氨酯结晶性的研究进展

概述了聚氨酯(PU)结晶性的研究方法,讨论了软硬段种类和结构、硬段含量、软段相对分子质量、带电离子及其它基团和热处理等对PU结晶性的影响,并介绍了结晶性PU在形体记忆材料中的应用状况。     

Studies on thermally stimulated shape memory effect of segmented polyurethanes

The shape memory behavior of a series of polycaprolactone/methane diisocyanate/butanediol (PCL/MDI/BDO) segmented polyurethanes of different composition was studied. The molecular weight of PCL diols was in the range of 1600–7000, and the hard segment content varied from 7.8 to 27% by weight. Film specimens for shape memory measurements were prepared by drawing at temperatures above the melting temperature of the soft segment crystals and subsequent quick cooling to room temperature under constrained conditions. The shape memory process was observed and recorded in a heating process. Parameters describing the recovery temperature, ability, and speed were used to study the influence of structure and processing conditions on the shape memory behavior of the sample. It was found that the high crystallinity of the soft segment regions at room temperature and the formation of stable hard segment domains acting as physical crosslinks in the temperature range above the melting temperature of the soft segment crystals are the two necessary conditions for a segmented copolymer with shape memory behavior. The response temperature of shape memory is dependent on the melting temperature of the soft segment crystals. The final recovery rate and the recovery speed are mainly related to the stability of the hard segment domains under stretching and are dependent on the hard segment content of the copolymers. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 64: 1511–1516, 1997     

鞋底喷漆用聚氨酯胶粘剂的研制

以聚酯多元醇作为软链段,以BDO、NPG和MDI作为硬链段一步法合成的鞋底喷漆用聚氨酯固体粒料,并溶解成15%固含量的胶粘剂。对聚酯多元醇的种类和分子量、扩链剂的用量、异氰酸酯的类型和异氰酸酯指数等作了讨论,结果表明:以邻苯二甲酸乙二醇-二甘醇酯,分子量在1500～2000时作软链段,新戊二醇和MDI为硬链段合成的聚氨酯胶粘剂在硬度、拉伸强度、透明度、软化点、附着力等方面能够满足鞋底喷漆用胶的要求。