共查询到20条相似文献,搜索用时 328 毫秒
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A/U-g-A型核壳聚氨酯-丙烯酸酯复合乳液的合成 总被引:1,自引:0,他引:1
通过加入双官能团单体甲基丙烯酸-β-羟乙酯(HEMA),采用溶液聚合法和原位乳液聚合法,把聚氨酯与丙烯酸(AA)、丙烯酸丁酯(BA)和苯乙烯(St)等丙烯酸酯单体接枝共聚,合成了PUA为壳、PA为核的聚氨酯-丙烯酸酯(PUA)复介乳液.研究了壳层PA/Pu、总PA/PU、核壳比、BA/St、壳层HEMA/PA和链转移剂含量对乳液制备过程、乳液及涂膜性能的影响.研究结果表明:PUA中的PA、BA、St、HEMA,链转移剂和DMPA与AA中的-COOH的含量(壳层PUA的质量分数)分别为55.6%、25%、17.8%、9%、1%和7%,核壳质量比为1:4时,复合乳液涂膜结构规整,各项性能较好.PUA胶粒的平均粒径在100 nm左右时,分布更均匀. 相似文献
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VAc/BA/AA共聚乳液胶粘剂的制备与性能研究 总被引:2,自引:1,他引:1
以醋酸乙烯酯(VAc)为原料、丙烯酸(AA)和丙烯酸丁酯(BA)为改性单体、过硫酸铵(APS)为引发剂、辛基酚聚氧乙烯醚(OP-10)和烷基酚聚氧乙烯醚琥珀酸酯磺酸钠(MS-1)为新型乳化剂体系,采用半连续种子乳液聚合法制备了VAc/BA/AA共聚乳液胶粘剂。研究了引发剂用量、乳化剂配比及用量、单体及种子单体用量对乳液性能的影响,并采用FT-IR对其结构进行表征。研究结果表明,当m(VAc)∶m(BA)∶m(AA)∶m(APS)∶m(OP-10)∶m(MS-1)=83∶14∶3∶0.4∶1.25∶0.25、w(种子单体)=17%(相对于总单体而言)时,乳液的综合性能最佳。 相似文献
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以聚四氢呋喃二醇(PTMG)、甲苯二异氰酸酯(TDI)、二羟甲基丙酸(DMPA)及丙烯酸β-羟乙酯(HEA)为主要原料合成水性聚氨酯(PU)大单体,得到HEA封端的聚氨酯,加入甲基丙烯酸甲酯(MMA)、磷酸酯功能单体等单体,以半连续乳液聚合法合成了水性含磷丙烯酸酯聚氨酯(P-PUA)。考察了DMPA用量、引发剂用量、丙烯酸磷酸酯单体用量、MMA用量对乳液和涂膜性能的影响。结果表明:DPMA用量、引发剂用量、丙烯酸磷酸酯单体用量、MMA用量分别为预聚体总量6.0%、3.0%~3.5%、5.0%、15.0%时,得到综合性能良好的P-PUA乳液,制得的涂膜附着力1级,涂膜耐水时间550 h,无闪蚀现象。 相似文献
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Elif Alyamac Hua Gu Mark D. Soucek Shuyan Qiu Rudolph G. Buchheit 《Progress in Organic Coatings》2012
Telechelic resins with reactive end groups (epoxy phosphate and epoxy ester) were synthesized using bisphenol-A (BPA) epoxide. The bisphenol-A based epoxide, the epoxy phosphate, and the epoxy ester were all modified with tetraethylorthosilicate (TEOS) oligomers, which were prepared through the hydrolysis and condensation of TEOS monomer with water under acidic condition. The epoxide/polysilicate (organic/inorganic) hybrid systems were characterized systematically, using FTIR, 1H, 13C, 31P, and 29Si NMR, and MALDI-TOF. The modified epoxides were thermally cured with a melamine-formaldehyde resin, cast on steel substrates. The coating performance of the modified epoxides was evaluated by pencil hardness, crosshatch adhesion, reverse and direct impact resistance, mandrel bending, and pull-off adhesion. Viscoelastic properties of the hybrid systems were also evaluated as a function of polysilicate content. Corrosion performance was evaluated via salt spray (fog) test for 264 h. Salt spray analysis revealed that inorganically modified epoxides provided improvement over the unmodified epoxide resins with respect to both corrosion resistance and adhesion to steel substrates. 相似文献
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Takatoshi Sato Yoshihiro Saito Ichiro Anazawa 《Journal of the American Oil Chemists' Society》1988,65(6):996-999
Thin layer chromatography with a flame ionization detection (TLC-FID) technique was applied to the separation and determination
of nonionic surfactants containing oxyethylene (OE) chains. The OE adducts with an average number of 4.2, 6.0 and 8.0 oxyethylene
units were separated on Chromarod S-II (Silica gel-coated rods) with double development using benzene:ethyl acetate (6:4)
and ethyl acetate:acetic acid:water (8:1:1). OE adducts of nonionic surfactants were well separated by the TLC-FID method
using simple and standard techniques that eliminate the need for any chemical modification. 相似文献
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研究了聚四氢呋喃多元醇/甲苯二异氰酸酯系聚氨酯弹性体低聚物的流变特性及黏度~温度关系。结果表明:该聚氨酯低聚物具有剪切变稀的假塑性,其非牛顿性随相对分子质量及分子链中氨酯基含量的增加而增强;而低聚物的黏度与温度的关系符合Andrade方程。同时探讨了自动化浇注聚氨酯制品工艺的优化问题。 相似文献
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采用分步加料法,以己二酸、1,4-丁二醇、季戊四醇、二羟甲基丙酸(DMPA)和丙烯酸为原料合成了光固化聚酯丙烯酸酯预聚体;采用FT-IR和DSC对产物进行了表征和分析;探讨了羟羧比(物质的量比,下同)、DMPA等对合成树脂附着力和粘度的影响。结果表明:羟羧比在1.2左右时树脂的附着力最好;催化剂质量分数为0.1%,阻聚剂质量分数为0.02%时,聚酯丙烯酸酯预聚体性能最佳。 相似文献
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含二氮杂萘酮联苯结构双马来酰亚胺的合成 总被引:1,自引:0,他引:1
由含二氮杂萘联苯酮结构的芳香族二元胺4-[4-(4-氨基苯氧基)苯基]-2-(4-氨基苯基)二氮杂萘-1-酮(DHPZ-DA)与顺丁烯二酸酐(MA)反应得到了含二氮杂萘酮联苯结构的双马来酰亚胺预聚物(DHPZ-BMI),并对其进行了FT-IR红外及1H-1H COSY NMR核磁表征。对其溶解性的研究表明,DHPZ-BMI易溶或部分溶解于一些常见低沸点极性溶剂,如氯仿、丙酮。利用示差扫描量热仪(DSC)对DHPZ-BMI热行为进行了研究,结果表明该预聚物的熔点较高,熔融和固化过程的温度范围在低升温速率下有所重叠。为此,加入不同含量的2,2′-二烯丙基双酚A(DABPA)改善其工艺性,并采用DSC对其热性能进行了初步研究,结果表明DABPA的加入,可明显改善树脂的固化行为。 相似文献
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遇水膨胀聚氨酯弹性体的合成及性能 总被引:1,自引:0,他引:1
以亲水性聚醚多元醇、甲苯二异氰酸酯(TDI)、三羟甲基丙烷(TMP)、三异丙醇胺(TIPA)和3,3′-二氯-4,4′-二氨基-二苯基甲烷(MOCA)等为主要原料,采用预聚物法合成了双组分浇注型遇水膨胀聚氨酯弹性体。研究了多元醇种类及配比、扩链剂种类及配比、增塑剂、异氰酸酯含量等对遇水膨胀聚氨酯弹性体性能的影响。结果表明,采用TDI/MOCA/TMP体系制备的遇水膨胀弹性体具良好的综合性能。 相似文献
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Chuan-Zhen Zhou 《Polymer》2005,46(24):10952-10959
The influence of annealing on the morphologies and optical properties of phenyleneethynylene pentamer films has been investigated by using optical microscopy, UV-vis spectroscopy, steady-state and time-resolved photoluminescence (PL). The optical microscopy study shows that the grainy morphology of crystallites with irregular shapes and sizes of the spincoated oligomer films reorganize into well-ordered single crystal-like laths or bamboo-like structures upon melt-crystallization or annealing. The crystalline features of the annealed films were simulated and modeled through molecular mechanics (MM) and molecular dynamics (MD) and further measured by X-ray diffraction. These studies revealed that the molecular backbones form lamellar and interdigitated conformations. Investigation of optical properties of the thermally treated films indicated that aggregates and excimers dominate excitation/emission processes due to molecular closely packing upon annealing, which are evidenced by the broadening, structureless absorption and luminescence spectra, as well as longer lifetime of PL dynamics. 相似文献