有机硅改性丙烯酸酯乳液的研究

通过乳液聚合聚制备有机硅改性丙烯酸酯乳液。乳液中的有机硅分子在催化剂的作用下与基材表面的羟基脱水交联,使粘接力大大提高。研究了有机硅功能单体用量以及丙烯酸交联单体对乳液性能的影响。ＦＴＩＲ分析表明有机硅烷与他共聚单体完全共聚 。     

γ-甲基丙烯酰氧基丙基三异丙氧基硅烷/丙烯酸酯共聚乳液的研究

采用种子乳液聚合工艺，制备出γ—甲基丙烯酰氧基丙基三异丙氧基硅烷／丙烯酸配共聚乳液。利用红外光谱、差热分析对共聚物进行结构分析，对酮不溶解率及四氢呋喃的溶胀率进行测定，结果表明，使用少量有机硅氧烷，成功地实现丙烯酸酯乳液分子改性，大大增加乳液粒子的交联度，从而提高了漆膜的耐水性、耐溶剂性和耐候性。     

羟基交联丙烯酸酯共聚乳液的性能表征

通过乳液的离心稳定性，电解质稳定性，胶膜的耐水性，红外光谱（IR），差热分析（DSC）等对羟基交联丙烯酸酯共聚乳液的性能进行了表征，结果表明：通过核壳聚合工艺把活性单体以壳单体的形式分布于乳胶粒的表面，可以显著降低胶膜的耐水性，提高交联度。用DSC对交联反应的动力学进行了研究，证实了核壳结构的共聚物与非核壳结构的共聚物相比较，具有更大的放热峰和较低的交联温度。     

烯烃基碳硅氧烷树枝状大分子单体及其应用

概述了烯烃基碳硅氧烷树枝状大分子单体的结构,介绍了层级为1和层级为2的烯烃基碳硅氧烷大分子单体的合成方法及结构表征,以及烯烃基碳硅氧烷树枝状大分子单体在有机聚合物改性及化妆品领域的应用,如:与有机单体溶液共聚制备有机硅改性共聚物、与丙烯酸酯单体乳液共聚制备有机硅改性丙烯酸酯乳液、与长链烷基丙烯酸酯共聚制备化妆品成膜剂、与甘油或木糖醇共改性制备亲水性有机硅交联共聚物等。     

交联型硅丙共聚乳液

华南理工大学的周新华等人采用γ -甲基丙烯酰氧基丙基三甲氧基硅烷 (A - 1 74)对丙烯酸酯乳液进行改性 ,得到交联型丙烯酸酯乳液。并对产物进行了红外、DSC、粒径及其分布、混合溶剂不溶解率等测试 ,证实了交联结构的存在。涂膜性能测试表明 ,A - 1 74极大地提高了聚丙烯酸酯的硬度、抗冲击性、耐水性、耐溶剂性和拉伸强度交联型硅丙共聚乳液     

过氧化物—双烯烃硫化丙烯酸酯橡胶

讨论由丙烯酸丁酯与丙烯腈共聚型丙烯酸酯橡胶用过氧化物硫化时，二乙烯基苯的共交联效应。二乙烯基苯可提高过氧化物对丙烯酸酯橡胶的硫化速度及硫化胶的性能。     

环氧粉末涂料交联型流平剂的研究

一、前言目前国内环氧粉末涂料的流平剂,就丙烯酸酯类聚合物而言,是一种分子链上无活性官能团的线型高分子聚合物。即参与共聚的单体分子链上无交联性的活性基团存在,对环氧粉末涂料的成膜仅起流平作用,而无化学过程。     

水性聚氨酯与丙烯酸酯乳液交联反应的研究

将由双丙酮丙烯酰胺（DAAM）参与共聚的丙烯酸酯乳液与含有肼基的聚 氨酯水分散体混合后，得到了交联型聚氨酯／丙烯酸酯复合乳液，利用红外光谱和透射电镜技术证实了酮羰基与肼基之间的交联反应的发生。对乳液膜性能的研究结果表明，交联反应极大地提高了乳液膜的耐水性，耐溶性，断裂强度，断裂伸长率。     

反应型乳化剂的合成及其与丙烯酸酯的乳液共聚

用聚乙二醇、芳香族二异氰酸酯和甲基丙烯酸羟乙酯为原料,制备了反应型乳化剂(RE),应用FTIR表征了RE的化学结构。进一步以RE为反应性单体与丙烯酸酯进行自由基共聚,制备了聚氨酯-丙烯酸酯共聚乳液,讨论了RE分子链中PEG链段的相对分子质量对乳液粒径及分布的影响。     

聚氨酯-丙烯酸酯复合乳液的研究进展

文中介绍了聚氨酯-丙烯酸酯复合乳液的制备方法,其中包括物理共混,交联共混,互穿网络乳液聚合,核一壳乳液聚合及乳液共聚法。同时从交联改性,有机硅改性,氟改性,纳米改性,环氧树脂改性等5个方面对改性聚氨酯-丙烯酸酯复合乳液的研究进展进行了综述。     

Improvement in wettability of pressure‐sensitive adhesive on silicon wafer using crosslinking agent with siloxane groups

Acrylic copolymers are prepared by radical polymerization of 2‐ethylhexyl acrylate, ethyl acrylate, and acrylic acid followed by crosslinking to manufacture the pressure‐sensitive adhesives (PSAs) for silicon wafer protection. Both higher reliability and wettability are required for the protective acrylic PSAs in the semiconductor processing applications. The siloxane linkages are introduced in the acrylic PSAs via crosslinking with siloxane‐containing crosslinking agent to modify the thermal and wetting properties of PSAs efficiently. The more efficient formation of crosslinked network structure was achieved with higher content of tetra‐functional crosslinking agent, and the surface energy of PSAs decreased significantly with increasing the content of siloxane linkage resulting in the improved areal wetting rate. The thermal stability of PSAs was also improved significantly by incorporation of siloxane linkages. The adhesion properties such as peel strength and probe tack of acrylic PSAs decreased significantly by increasing the content of either crosslinking agent or siloxane linkage. The acrylic PSA with siloxane group showed both satisfactory wetting and clean debonding properties for the optimal protection of thin silicon wafers. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

轻度交联有机玻璃的研制

研究了以甲基丙烯酸甲酯（MMA）为主体、三嗪酯类（TAC）为交联剂制备的轻度交联有机玻璃体系中,交联剂用量、聚合工艺对板材结构和性能的影响。概述了共聚反应原理,经与国外同类航空有机玻璃性能对比,最终确定了最佳配比和最佳工艺条件。     

外交联功能型丙烯酸乳液涂料的制备

为了制备常温外交联水性丙烯酸乳液涂料,提高其涂层的交联密度和综合性能,首先以丙烯酸酯类为主要单体,十二烷基磺酸钠、辛烷基酚聚氧乙烯醚和烷基二苯醚二磺酸钠为复合乳化剂,用核壳乳液聚合的方法合成具有外交联特性的水性丙烯酸功能乳液.然后用聚酰胺环氧氯丙烷(PAE)外交联剂对乳液进行交联改性.研究结果表明:胶膜的交联度、硬度、...     

反相悬浮聚合法制备XG-g-PAA高吸水性树脂

采用黄原胶(XG)为基体,丙烯酸(AA)为接枝聚合单体,环己烷为连续相,过硫酸钾为引发剂,利用反相悬浮聚合法合成了XG-g-PAA高吸水性树脂。研究了丙烯酸与黄原胶质量比、引发剂(KPS)用量、交联剂(NMBA)用量、丙烯酸中和度和聚合反应温度等因素对树脂吸水率的影响。利用傅立叶变换红外光谱仪(FTIR)、扫描电镜(SEM)和热重分析仪(TGA)对产物进行了表征。结果表明,丙烯酸与黄原胶发生接枝共聚,在最佳工艺条件下制备的XG-g-PAA高吸水性树脂具有良好的吸水和抗盐性能,高温保水性能提高,对蒸馏水的吸水率为845 g.g-1,对质量分数0.9%的NaCl水溶液的吸水率为96.3 g.g-1,接枝率达126.5%,接枝效率达82.6%。     

Effect of crosslinking density on adhesion performance and flexibility properties of acrylic pressure sensitive adhesives for flexible display applications

The use of acrylic pressure sensitive adhesives (PSAs) in flexible displays involves their attachment to each layered device. Due to the high industrial demand of flexible displays, acrylic PSAs must necessarily exhibit high flexibility. In this study, the effect of the crosslinking density of acrylic PSAs on their adhesion and flexibility properties has been investigated by incorporating a diisocyanate crosslinking agent into the PSA structure. As the content of the crosslinking agent increased, the measured peel strength and tack of the synthesized PSAs decreased, while the maximum value of the lap shear stress increased. In addition, the maximum stress and shear strain determined for the crosslinked PSA specimens decreased with an increase in the crosslinking agent concentration (although, the stress measured at low strain values was initially increasing until the crosslinking agent content reached 1 phr). The results of stress relaxation testing showed a stress increase at specified strain levels with an increase in the crosslinking agent content up to 0.5 phr, while the results of creep testing revealed that the measured strain was inversely proportional to the degree of elastic recovery. The obtained data indicate that crosslinking generally improves the PSA properties related to their use in flexible display applications; however, very high crosslinking densities produce mostly a negative effect on the PSA flexibility and adhesion characteristics.     

丙烯酸-丙烯酰胺共聚物/聚乙烯醇高吸水纤维研制

采用潜交联剂丙烯酸羟丙酯与丙烯酸、丙烯酰胺等单体共聚后与聚乙烯醇共混配制成纺丝原液, 湿法纺丝成形后经后交联处理赋予纤维三维网状结构,制得具有较好吸水性能的丙烯酸-丙烯酰胺共聚物/ 聚乙烯醇共混纤维,研究了后交联处理条件对纤维结构及性能的影响。结果表明,随着交联温度的升高,交联时间的延长,纤维的饱和吸水率降低。纤维经130℃交联处理12 min后,其饱和吸水率可达405 g/g。     

光引发壳聚糖接枝丙烯酸制备高吸水性树脂的研究

采用光引发的方式,将壳聚糖与丙烯酸进行接枝共聚反应,制备出高吸水性树脂,研究了壳聚糖与丙烯酸的质量比、反应温度、反应时间、交联剂用量等对接枝共聚反应的影响。结果表明,影响产品吸水倍率的大小顺序是:壳聚糖与丙烯酸的质量比、反应温度、反应时间、交联剂的用量,最佳用量依次分别为:8 g/g,65℃,2 h,0.3%,在此工艺条件下合成的高吸水性树脂最高吸水率可达301.12;影响接枝率的大小顺序为:壳聚糖与丙烯酸的质量比、反应时间、交联剂用量、反应温度,最佳用量依次分别为:10 g/g,3 h,0.1%,75℃。     

Photocrosslinking of solvent-based acrylic pressure-sensitive adhesives (PSA) by the use of selected photoinitiators type I

This study investigated the photocrosslinking of solvent-based acrylic pressure-sensitive adhesives (PSA) containing selected photoinitiators type I, known as α-cleavage photoinitiators. Photocrosslinking of PSA, especially of acrylic PSA, is well established crosslinking process using the UV radiation technology. UV-initiated crosslinking of acrylic PSA allows the synthesis of the wide range of UV-crosslinkable PSA with the interesting features. Especially, the important balances of properties such as adhesive and cohesive strength which are typically critical for the application performance can be achieved by this technology. The selection of suitable photoinitiator plays an important role to obtain the optimum properties of acrylic PSA including tack, peel adhesion, and shear strength. In this study, the investigations on different saturated conventional photoinitiators of type I for solvent-based PSA were carried out. The effects of photoinitiator concentration, UV crosslinking time and UV dose on the tack, peel strength, and shear strength were explored in detail for guiding the choice of photoinitiators to fabricate advanced PSA for industrial usage.     

淀粉接枝丙烯酸/丙烯酰胺耐盐型高吸水性树脂的制备

以淀粉为主要原料,丙烯酸（AA）和丙烯酰胺（AM）为接枝单体,采用水溶液聚合法制备具有耐盐型高吸水性树脂。探讨了原料配比、丙烯酸中和度、反应温度等因素对产物吸水性能的影响,结果表明,在聚合温度为50℃,淀粉、丙烯酰胺、引发剂和交联剂用量分别为丙烯酸用量的15%、40%、2.4%和0.03%的条件下,所制备的耐盐型高吸水...