紫外吸收剂在偏光片TAC膜中的应用研究

采用溶剂铸膜工艺制备了含有紫外吸收剂的偏光片TAC(三醋酸纤维素)膜,并进行了膜的光学性能测试,特别测试了偏光片TAC膜的紫外线吸收范围。通过筛选不同结构的紫外吸收剂和调整偏光片TAC膜中紫外吸收的用量,最终确定了合适的紫外吸收剂及其用量。同时阐述了偏光片TAC膜中紫外吸收剂的应用方法和注意事项。     

光致变色染料堆积密度对TAC膜变色性能的影响研究

以三醋酸纤维素酯为中心介质制备的光致变色TAC膜,当外界有紫外光射入光致变色TAC膜时,膜层内部镶嵌的光致变色染料吸收紫外光能量,发生能级跃迁,物质结构发生变化,使TAC膜从无色变为有色。随着光致变色TAC膜受光时间增长,在薄膜上可以看到明显的光致变色效果。这种光致变色TAC膜可以和偏光片组合成一种新型的光致变色偏光镜片。根据光致变色TAC膜层受光干涉变色原理设计光致变色染料堆积密度对TAC膜变色性能的影响实验。在光致变色偏光太阳镜指标范围内,确定光致变色染料在厚度为80um的TAC膜内添加量为1.083g/m2。通过控制单位平米光致变色染料添加量一致,增加TAC膜层厚度,降低光致变色染料在TAC膜内部堆积密度,提供充足的内部空间支撑光致变色粒子结构的转化。通过固定光致变色染料添加量确定合适的光致变色染料堆积密度。从而增加光致变色TAC膜变褪色速率及变色深度,充分发挥光致变色染料的光变色的效果。     

抗菌肽(tachyplesin Ⅰ)串联基因的构建、表达及抗菌活性

为了实现通过基因工程方法制备具有稳定结构的抗菌肽tachyplesin Ⅰ,采取了tachyplesinⅠ基因串联表达的方法.实验以高拷贝穿梭表达载体pSBPTQ为表达载体,通过RT-PCR扩增tachyplesin Ⅰ基因(tac)和采用直接退火的方法合成tachyplesin Ⅰ串联基因(2tac).构建重组表达载体pSBPTQ-TAC和pSBPTQ-2TAC,转化到枯草杆菌WB800实现高效表达,经2％蔗糖诱导获得表达串联产物(2TAC)和TAC.通过离子交换柱层析纯化后得表达产物2TAC和TAC,2TAC经BrCN水解后,对表达产物抑菌活性分析,观察发酵液上清对大肠杆菌(E.coli K88)和伤寒沙门氏菌(Salmonella typhi)的抑菌圈和细胞微观形态的变化.实验结果表明:基因tac和2tac在枯草杆菌中表达成功,表达产物在发酵上清液中的含量分别约为8.25、17.36 mg·L-1;表达产物TAC和2TAC对大肠杆菌K88和伤寒沙门氏菌都具有明显的抑菌作用,2TAC经BrCN水解产物抑菌活力高于TAC.     

增塑剂对TAC膜物理机械性能的影响

TAC膜作为光学薄膜,应用越来越广泛,但与其他薄膜相比,TAC膜具有脆性大、耐折次数低、尺寸稳定性较差等缺点。试验表明,在生产中加入增塑剂,保持TPP用量占TAC量的6%~10%,并和BDP保持2∶1的比例,将有利于TAC膜的成型加工和剥离,更能有效改善偏光片用TAC膜的物理机械性能。     

TAC膜吸湿性相关因素调查与分析

吸湿是TAC膜的固有特性,由此导致膜的变形、产生压点、印痕等问题给下游偏光片客户的使用造成影响,从而制约了TAC膜向高端应用领域的发展,成为TAC膜亟待解决的质量问题之一。为了克服TAC膜易吸湿的缺点,国外生产厂家通过限制原材料醋酸纤维素的取代基位置和取代程度、选择专门的UV吸收剂和增塑剂以及添加纳米颗粒的措施来改善薄膜在高湿度环境下的吸湿性。本论文在查阅文献的基础上,结合自身的工作实际,对增塑剂的使用进行优化,以期改善TAC膜的吸湿性。本论文首先建立了5项检测方法,用以表征TAC膜的吸湿性,并选取国外厂家竞品作为改善目标值。之后选取纤维素、增塑剂TPP、增塑剂DMEP、增塑剂BDP、纳米粒子作为要素,采用正交试验的方法,确定优化方向。     

BiTAC电解槽更新总结

8个回路的Bi TAC电解槽,其中1个回路更换为n-Bi TAC,7个回路改造为i-Bi TAC。分析改造前后的运行数据,说明改造后电流效率提升,成品碱品质提高,电压降低。     

混合溶剂中水分对TAC膜质量的影响研究

作为液晶显示光学用TAC薄膜与TAC感光片基相比,对其性能指标都提出了更高的要求,尤其表观点状缺陷的控制标准更是由毫米级升至微米级,而TAC膜质量受多种因素影响.通过对混合溶剂中不同梯度含水量时,棉胶及刮片膜质量的影响情况分析,得出了混合溶剂中水分对TAC膜的影响,并最终优化得出混合溶剂中含水量的最佳控制范围.     

基于专利分析开展的光学TAC膜竞争态势研究

在专利文献数据的基础上,对光学TAC膜技术、区域和竞争对手等进行深入研究,希望从专利技术成果方面对光学TAC膜的发展现状、竞争态势进行客观评价。研究结果显示,光学TAC膜领域在1970年—2017年共申请专利2272件,研究重点主要集中于配方及工艺技术方面。日本是光学TAC膜的主要技术发源地,而美国、韩国、中国和中国台湾是重要的目标市场。通过深入分析光学TAC膜专利信息,了解该领域的研究现状和竞争态势,可以为我国光学TAC膜技术创新提供一定的借鉴和参考。     

助交联剂对动态硫化乙烯-辛烯共聚物/聚丙烯弹性体性能的影响

研究了助交联剂三烯丙基氰脲酸酯（TAC）及其与N,N＇-（1,3-亚苯基）二马来酰亚胺（HVA-2）并用对动态硫化乙烯-辛烯共聚物/聚丙烯弹性体（POE/PP TPV）性能的影响。结果表明,单独采用TAC作助交联剂时,POE/PP TPV的力学性能不理想;而当TAC与HVA-2并用时,POE/PP TPV的力学性能较单独使用TAC时有明显提高,且POE和PP两相间的相互作用力增大。TAC和HVA-2两者并用后,POE的熔融温度升高,结晶熔融焓降低,而PP的熔融温度降低,结晶熔融焓升高。     

技术性贸易壁垒对偏光片用三醋酸纤维素酯膜添加物选择的影响以及应对

简要介绍了我国液晶显示用三醋酸纤维素酯膜(TAC)产业的发展以及TAC配方中各类添加剂使用的基本情况.分析了技术性贸易壁垒对我国液晶显示用TAC膜生产的影响,并提出应该在技术改造和转型升级、重视技术积累和创新、完善标准体系、建立风险预警机制等方面下功夫,求得产业更大的发展.     

TAC对DAIP树脂体系的改性研究

研究了三聚氰酸三烯丙基酯 (TAC)对间苯二甲酸二烯丙基酯 (DAIP)树脂体系的耐热性能、力学性能、介电性能以及耐水性能的影响。结果表明 ,加入一定量的TAC可以明显提高DAIP树脂的耐热性。     

Copolymers of higher alkyl methacrylates with triallyl cyanurate

Copolymers of higher methacrylates (propyl, pentyl, hexyl, cyclohexyl, heptyl, octyl, and dodecyl) with triallyl cyanurate were synthesized by free-radical polymerization using benzoyl peroxide as initiator. The properties of the copolymers such as thermal stability, T_g, Vicat softening temperature, hardness, refractive indices n_D, chemical stability, density, and shrinkage on polymerization were studied. The influence of the alcohol alkyl chain length in methacrylates and the content triallyl cyanurate in copolymers on their properties is discussed. © 1995 John Wiley & Sons, Inc.     

The glass transition of irradiated poly(methyl methacrylate) compositions incorporating triallyl cyanurate

A mechanical torsion pendulum has been used to observe changes in viscoelastic behavior resulting from modification of polymer structure. Crosslinking, with consequent increase in glass temperature, has been observed in irradiated poly(methyl methacrylate) compositions incorporating triallyl cyanurate, which confers partial protection against chain scission.     

Gamma‐ray irradiation effect of polyethylene on dimaleimides as a class of new multifunctional monomers

Multifunctional monomers, m‐xylylenedimaleimide, p‐phenylenedimaleimide, m‐phenylenedimaleimide, and p‐phenylenedinadimide, all of which have maleimide groups, were synthesized to increase thermal and radiation stabilities. The synthesized multifunctional monomers showed good compatibility with low‐density polyethylene (LDPE). Mixtures of LDPE and these multifunctional monomers were irradiated with γ‐rays from a Co‐60 source at room temperature in a nitrogen atmosphere. The absorbed dose ranged from 0 to 160 KGy. Among these multifunctional monomers, m‐xylylenedimaleimide was the best in gel fraction enhancement. Crosslinked LDPE with m‐xylylenedimaleimide displayed a higher modulus than that of crosslinked LDPE with triallyl cyanurate. For the elongation property, LDPE with m‐xylylenedimaleimide as a multifunctional monomer showed better results than that with commercial multifunctional monomers such as triallyl cyanurate (TAC) and trimethylol propane triacrylate (TMPTA). © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 2339–2345, 2003     

TAC改性DAIP树脂固化产物性能的研究

当加入一定量的TAC可以明显提高DAIP树脂的耐热性。本文主要研究了三聚氰酸三烯丙基酯（TAC）改性DAP树脂体系的固化应参数以及反应机理。结果表明：改性树脂的固化过程包括三个固化峰，其表现活化能为173kJ/mol,107.8kJ/mol,89.9kJ/mol，分别相应于增韧剂，DAIP及TAC的固化峰。     

Surface properties of polyethylene grafted with triallyl cyanurate in the presence of an electron beam

The surface energy and thermodynamic work of adhesion of polyethylene grafted with triallyl cyanurate in the presence of an electron beam have been determined. The surface energy increased with the grafting level and with the irradiation dose up to 10 Mrad. A similar trend was observed with the work of adhesion. The changes in these surface properties were correlated with the concentration of the polar groups as measured by IR (infrared) spectroscopy and ESCA (electron spectroscopy for chemical analysis) studies.     

Postcrosslinking of linear polyesters. I melt-blend-type UV-induced crosslinking agents

Postcrosslinking of such linear polyesters as poly(ethylene terephthalate) (PET) and poly(butylene terephthalate) (PBT) are known to be attractive means to improve their thermal resistances without sacrificing their melt processibilities. Effective melt-blend-type ultraviolet-induced crosslinking agents were investigated among allyl compounds. Such polyallyl compounds as triallyl cyanurate and triallyl isocyanurate were found to be practically promising agents from the viewpoints of crosslinkability and stability in the polyester melt. The crosslinkability of the ally compounds increased with increasing the number of the allyl groups in the molecule and electron-withdrawing property of the neighboring group to which the allyl group was attached. The crosslinking mechanism likely includes both the polymerization of the allyl compound to form semi-interpenetrating polymer networks in the polyester matrix and the reaction between the polyester and the allyl compound moiety. The crosslinked PET and PBT showed good mechanical properties even above the melting points of the ordinary PET and PBT.     

Copolymerization of alkyl acrylates with triallyl cyanurate: Kelen-Tüdös method applied for determining copolymerization reactivity ratios

The copolymerization of methyl acrylate (MA), ethyl acrylate (EA), straight-chain butyl acrylate (n-BA) and styrene (S) with triallyl cyanurate (TAC) has been studied in bulk at 343±1 K using benzoyl peroxide as initiator. The reactivity ratios of the monomers are determined by the Fineman-Ross (F-R) method and compared to those determined by the Kelen-Tüdös (K-T) method.     

A study of the thermal and mechanical properties of electron beam irradiated HDPE/EPDM blends in the presence of triallyl cyanurate

The enhancing effects of cross-linking by the addition of 1, 3, and 5 wt% of triallyl cyanurate (TAC) to blends containing 80 wt% of high-density polyethylene (HDPE) and 20 wt% of ethylene–propylene diene monomer (EPDM) during electron beam irradiation were investigated. More specifically, the thermal and mechanical properties were studied as a function of the electron beam irradiation dose and an amount of the cross-linking agent, such as triallyl cyanurate (TAC). The results showed that the values of the gel content, thermal stability, tensile properties, impact strength, and rheology increased with increasing irradiation dose up to 150 kGy. For higher doses, the values decreased. Addition of the cross-linking agent to the HDPE/EPDM blends showed an enhanced cross-linking effect of various properties during electron beam irradiation. The addition of 3 wt% of TAC led to the highest thermal and mechanical properties. An irradiation dose of 150 kGy with the addition of 3 wt% TAC was the optimal condition to obtain blends with the best properties.     

Photoinduced crosslinking of polyolefine blends. I. Crosslinking of LDPE,PP, and LDPE/PP blends

Photocrosslinking of low-density polyethylene, (LDPE), polypropylene (PP) and their blends was investigated using xanthone and triallyl cyanurate as a photoinitiator and a coagent, respectively. The influence of the change of UV-irradiation conditions on the yield of photoinitiated processes was found to be very similar at any composition, while the crosslinking efficiency decreases with increase of PP content in the blend. The mechanism of the TAC action in photocrosslinking process was proposed and the effect of TAC reactions is discussed with regards to the effectivity of crosslinking of LDPE, PP, or the blends. © 1995 John Wiley & Sons, Inc.