苯并三唑类紫外线吸收剂

正紫外线吸收剂是光稳定剂中一类重要品种。其中,苯并三唑类紫外线吸收剂具有性能稳定,毒性低,吸收紫外线能力强,能够抑制或减弱光降解作用,提高合成材料的耐光性能,与高分子材料相容性好,广泛地应用于聚烯烃、聚酯树脂、涂料、食品包装、感光材料等各种合成材料制品中。苯并三唑类紫外线吸收剂的合成方法是:重氮化、偶合、还原。前两步是较成熟的工艺,而还原方法有很多种。还原剂有:锌粉、氢气、葡萄糖、醇类、甲醛、聚甲醛、     

苯并三唑类紫外线吸收剂

紫外线吸收剂是光稳定剂中一类重要品种。其中,苯并三唑类紫外线吸收剂具有性能稳定,毒性低,吸收紫外线能力强,能够抑制或减弱光降解作用,提高合成材料的耐光性能,与高分子材料相容性好,广泛地应用于聚烯烃、聚酯树脂、涂料、食品包装、感光材料等各种合成材料制品中。     

苯并三唑类紫外线吸收剂的研究进展

论述了应用最广泛的紫外线吸收剂苯并三唑类化合物在提高消光系数、引入可聚合基团以及和其它光稳定剂如受阻胺光稳定剂的协同作用等方面的研究进展。     

保险粉法合成紫外线吸收剂UV-326

大气层中的臭氧层仅能屏蔽280nm以下的紫外光，而280nm以上的紫外线对人体非常有害。化学名称为2-（2-羟基-3-叔丁基-5-甲基苯基）-5-氯-苯并三唑的紫外线吸收剂UV-326不仅能够吸收280～370nm的紫外线，且其稳定性好、毒性小，是苯并三唑类紫外线吸收剂中唯一被美国FDA批准可用于与食品接触的塑料制品的添加剂，也可广泛应用于涂料、合成橡胶、合成纤维、光敏材料等，有效提高这些材料的耐光性。     

ASA耐候性影响因素研究

通过考察老化前后色差的变化,研究了耐候剂、色粉、橡胶种类对ASA树脂耐候性的影响。结果表明,受阻胺光稳定剂的加入明显提高了ASA树脂的耐候性,复配苯并三唑类紫外线吸收剂,耐候性可进一步提升。黑色和白色ASA耐候性相对更好,而红色的ASA则由于有机色粉的迁移析出,耐候性较差。AES高胶粉的加入对ASA改性材料的耐候性影响很小,ABS高胶粉的加入在短期内对ASA改性材料的耐候性影响不大,但对其中长期耐候性影响较明显。通过对比表面显微IR谱图,发现ASA树脂老化变色主要是由于生成了含羰基的芳酮等有色基团所致。     

阻燃聚碳酸酯耐候性能研究

以阻燃聚碳酸酯材料为研究对象,探讨了不同种类抗冲击改性剂、不同种类阻燃剂、不同种类紫外线吸收剂、不同种类抗水解助剂对阻燃聚碳酸酯材料耐候性能的影响。结果表明:添加以硅橡胶为核的MSiA抗冲击改性剂的阻燃聚碳酸酯材料耐光性能和耐水性能均最好;添加磷腈类阻燃剂SPB-100的阻燃聚碳酸酯材料耐光性能与耐水性能均最好;添加氰基丙烯酸酯类紫外线吸收剂Uvinul 3030的阻燃聚碳酸酯材料耐光性能最好;添加聚合碳化二亚胺抗水解剂Stabaxol P100的阻燃聚碳酸酯材料耐水性能最好。     

苯并三唑类紫外线吸收剂的研究进展

介绍苯并三唑类紫外线吸收剂当前发展概况及其改性品种,指出该领域正向着高分子质量、多功能化和反应性化方面发展,其中一些品种已工业化并且用于塑料工业.同时,还详细介绍了苯并三唑类紫外线吸收剂的合成方法.     

改性丙烯酸树脂文物保护材料耐光性能研究

研制了苯并三唑类紫外线吸收剂改性丙烯酸树脂文物保护材料。通过红外光谱、反射光谱和光失重率的测试表明,改性丙烯酸树脂材料具有优异的耐光老化性能,对基材和彩绘文物起到了保护作用,且老化后保护材料基本不改变原有外观,应用前景广阔。     

新型紫外线吸收剂

传统的较低分子质量的紫外线吸收剂在加工温度较高时容易挥发、分解和迁移，尤其是受阻胺类光稳定剂在多数树脂聚合物中的应用受到限制。大连化工研究设计院自主研发和创新，采用新工艺、新方法先后成功生产了UV-234和UV-360（苯并三唑类）、UV-1164和UV-1577（三嗪类）等新型紫外线吸收剂产品。该类产品的特点是挥发性低，可防止在高温加工时的损耗；对聚合物有极好的相容性；耐热性好，如UV-234特别适用于需要在高温下加工的聚合物。     

邻羟基苯并三唑类紫外线吸收剂的结构与作用特点及发展趋势

邻羟基苯并三唑类紫外线吸收剂,也称羟基苯并三唑类紫外线吸收剂,简称苯并三唑类紫外线吸收剂,是国际、国内消费量最大的一类紫外线吸收型光稳定剂。     

Behavior of zirconium compounds in polymers—A review

Zirconium compounds dispersed in polymers often bond the polymer molecules together, increasing their stability. This can generally be attributed to the formation of covalent bonds between zirconium atoms and small atoms of high electronegativity of the polymer molecule, to overlapping of pi orbitals of unsaturated moieties of the organic compound with sigma orbitals of the zirconium atoms, to fractional bond formation between zirconium and organic hydrogen, and to combinations of these. Bonding and its effects on physical properties have been achieved by molecular dispersions of zirconium compounds in the polymer, by dispersion of insoluble particles of zirconium compounds, and through residues from zirconium catalysts used in polymer preparation. Coatings and plastic components have been improved in strength and in durability by the dispersions. Compounds of other metals often perform similarly. The totality of relevant properties of zirconium compounds often leads to their preferential use.     

Synthesis of some symmetrically substituted stilbene‐triazine derivatives containing tetramethylenepiperidine fragments and their application to make self‐whitening polyacrylonitrile

This study reports the synthesis of nine new fluorescent stilbene‐triazine whitening agents containing a tetramethylpiperidine fragment. These products were isolated and characterised by spectroscopic techniques, i.e. infrared, ultraviolet, and fluorescent spectra, and confirmed by proton nuclear magnetic resonance spectroscopy. The photostability of the new compounds and two optical brighteners containing an unsaturated group without a stabiliser fragment was studied. It was found that the compounds containing tetramethylpiperidine have better photostability. The possibility of the copolymerisation of the unsaturated compounds with acrylonitrile was investigated, and self‐whitening polymers with an intense blue fluorescence were obtained. It was established that 85–86% of the fluorophores are chemically bound to the polymer chain.     

The Study of Reactive Functional Groups in Adhesive Bonding at the Aramid-Epoxy Interface

In polymeric composites, reactive functional groups on the fiber surface are assumed to enhance the mechanical strength of the fiber-matrix interface greatly by forming covalent bonds with the matrix. To test this assumption, we sought to promote covalent bonding at the aramid fiber-epoxy matrix interface by attaching flexible reactive pendent groups to the fiber surface. Other factors that could affect interfacial adhesion were kept constant, i.e., surface energy and surface topography. Quantitative analysis showed a pendent group attachment level of 1.5 to 4.5 groups per 100 Ų of fiber surface, a level that agrees well with the theoretical amount. Surprisingly, in adhesive performance tests, the presence of these reactive pendent groups did not improve the fiber-matrix interface strength. Specific chemical tests for covalent bond formation between the terminal amine of the pendent group and the epoxy molecule showed that covalent bonding did not occur, thus explaining the unexpected lack of improvement in adhesive performance.     

不饱和聚酯树脂稳定化研究进展

介绍了不饱和聚酯树脂稳定化方面的新近研究进展,包括不饱和聚酯制品如玻璃钢表面新型涂层及新型稳定剂(紫外线吸收剂、受阻胺光稳定剂和抗氧剂)等。研究表明,只使用单一的稳定剂效果不佳,必须将主抗氧剂、副抗氧剂和其他添加剂(例如某些环氧化合物)并用,才能取得较好的稳定效果。     

Synthesis and dyeing performance of a novel yellow crosslinking polymeric dye

A polymeric dye was synthesised via the reaction of 2,4-dinitrochlorobenzene and polyallylamine prepared from the homopolymerisation of monoallylammonium chloride. The polymeric dye was fixed to cotton and silk via a crosslinking agent [2-chloro-4,6-di(aminobenzene-4'-β-sulphatoethylsulphone)-1,3,5- s -triazine]. The fixation of this polymeric dye reached 99% and the dyeing was fast to dimethylformamide at the boil, indicating that the dye fixation was through covalent bonding with the crosslinking agent, which acted as a bridge between the fibre polymer and the dye molecule. The dyed samples showed excellent fastness to washing and rubbing.     

Functional polymers. LV. Photochemical behavior of 2(2-hydroxyphenyl)2H-benzotriazole derivatives

Summary Polymerizable 2(2-hydroxyphenyl)2H-benzotriazole ultraviolet absorbers have the normal hydrogen bonded maximum at 340 nm. When more than one ortho-hydroxy group capable of hygen bonding is present in the molecule the extinction coefficient increases dramatically; the fluorescence spectra are also affected. It is expected that these compounds are very effective ultraviolet stabilizers.Functional Polymers. LIV., G.S. Dai, S.K. Wu, A. Sustic, F. Xi, and O. Vogl, Polymer Bulletin 20, 67 (1988)     

The correlation between the ionic degree of covalent bond comprising polymer main chain and the ionic yield due to mechanical fracture

The mechanical force to polymeric materials in vacuum at 77 K produces mechano radicals, mechano anions and mechano cations due to homogeneous and heterogeneous scissions of the covalent bonds comprising polymer main chain. The ionic degree of the covalent bond was estimated by calculating the “absolute ΔMulliken atomic charge,” which was defined as the difference between the Mulliken atomic charges of the two adjacent atoms comprising the covalent bond of the polymer main chain. The ionic yield of the covalent bond increased with increasing the absolute ΔMulliken atomic charge. The empirical formula for the ionic yield was obtained with the absolute ΔMulliken atomic charge, and indicates that the ionic yield could be estimated from its chemical structure.     

Surface-initiated controlled polymerization as a convenient method for designing functional polymer brushes: From self-assembled monolayers to patterned surfaces

Surface-functionalization mediated through “grafting from” methods is of considerable interest as means to tailor the chemical and physical properties of functional substrates in a reliable way. The resulting polymer brushes, obtained by a “grafting from” strategy, are composed of grafted polymer chains tethered from one of their extremities to a surface by a covalent bond. Tuning the molecular parameters of these polymeric brushes such as the nature of monomer, the grafting density, and the chain length as well as the design of micropatterned structures enables delicate modification of the properties of these substrates, paving the way to the development of functional surfaces. In this review, we highlight recent and most important approaches to form monolayers and to subsequently elaborate homogeneous and heterogeneous coatings of polymer brushes by surface-initiated polymerization. The control of initiator molecule assembly is particularly important for the final configuration of polymer brushes. We report the creation of homopolymers and block copolymers using major controlled polymerization techniques as well as lithographic techniques aiming at the design of polymeric (micro- or nano-) patterns.     

新型低成本耐老化聚氨酯弹性体的研究

以酯基间有2~6个碳原子的聚酯二元醇（CMA-24、CMA-44、CMA-254、CMA-66）、甲苯二异氰酸酯和扩链剂3,5-二甲硫基甲苯二胺（DMTDA）为原材料,通过预聚体法制备了一种耐水解聚酯型聚氨酯弹性体。探讨了水解稳定剂、防酶剂、紫外线吸收剂和抗氧剂等助剂对聚氨酯弹性体性能的影响,测定了耐水解聚酯型聚氨酯弹性体的耐湿热老化和耐海水性能。结果表明,通过添加适量的水解稳定剂、防霉剂、紫外线吸收剂和抗氧剂可大幅度提高聚酯型聚氨酯弹性体的耐湿热老化和耐紫外线老化性能,特别是耐海水性能较传统的聚酯型聚氨酯弹性体提高了5倍以上。     

Synthesis of solvatochromic merocyanine dyes and their immobilization to polymers

Solvatochromic merocyanine dyes were immobilized onto polymer surfaces and copolymerized with acrylic resins, yielding novel reversibly solvatochromic polymers, which were used as solvent polarity indicators that exhibited different colors in water and alcohols. To generate solvatochromic polymer for solvent polarity indication, two solvatochromic merocyanine dyes containing moieties, which allow their immobilization onto polymer surfaces, or copolymerization with acrylic and vinyl monomers, were sequentially synthesized in four and six steps. Merocyanine dye (E)‐2‐(2‐(1‐(6‐aminohexyl)pyridinium‐4‐yl)vinyl)‐4,6‐dichlorophenolate (AHPVD) was prepared with a terminal aminohexyl group which allowed covalent bonding to activated carboxylated or sulfonated polymeric materials. The dyes were covalently bonded to the polymer surfaces, such as, nylon, polycarbonate, polyethylene terephthalate, and silicone. Solvatochromic merocyanine dye (E)‐2‐(2‐(1‐(6‐acrylamidohexyl)pyridinium‐4‐yl)vinyl)‐4,6‐dichlorophenolate (AAPVD) was synthesized for radical copolymerization with acrylate and vinyl monomers and oligomers. Side‐chain solvatochromic merocyanine‐containing hydrophilic polymers with differential water and alcohol absorption were obtained upon photoinitiated radical copolymerization with specially formulated acrylated resins. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44451.