Flame retardancy of cotton textiles by plasma-induced graft-polymerization (PIGP)

The permanent fire proofing of textiles of natural origin such as cotton is still challenging because only a surface treatment can be applied. Moreover, to be resistant to washing or harsh weather conditions the flame retardant must be fixed strongly to the surface, most efficiently achieved via covalent bonds. For that purpose, the simultaneous grafting and polymerization of fire retardant monomers on cotton fabric induced by argon plasma have been investigated with four acrylate monomers containing phosphorus, diethyl(acryloyloxyethyl)phosphate (DEAEP), diethyl-2-(methacryloyloxyethyl)phosphate (DEMEP), diethyl(acryloyloxymethyl)phosphonate (DEAMP) and dimethyl(acryloyloxymethyl)phosphonate (DMAMP), which are known to be effective for this application. We also report the synthesis and the plasma-induced graft-polymerization (PIGP) of two new phosphoramidate monomers, diethyl(acryloyloxyethyl)phosphoramidate (DEAEPN) and acryloyloxy-1,3-bis(diethylphosphoramidate)propan (BisDEAEPN) on cotton fabrics. Their flame retardant effect was compared with the previously used acrylate phosphate and phosphonate monomers. DEAEPN and BisDEAEPN exhibit the highest LOI values (28.5 and 29.5 respectively). The good flame retardant properties of these phosphoramidate monomers are attributed to the presence of nitrogen which causes a synergistic enhancement in the efficiency of phosphorus-based flame retardants. The grafting and the polymerization processes taking place on the surface of the cotton textile were followed by weighing measurements, IR (ATR) spectroscopy and SEM. The fire retardant character of the treated fabrics was investigated by thermogravimetric analyses and LOI measurements. The durability of the treatment was investigated by using the accelerated method of laundering proposed by McSherry et al.     

丙烯酸酯改性双环戊二烯酚型环氧树脂及其性能研究

通过FT－IR光谱表征了丙烯酸酯改性的DCPD酚型环氧树脂／DDM体系结构，并通过测定改性体系的凝胶时间和分析凝胶时间的影响因素，研究了该体系的反应特性，同时，对改造前后DCPD酚型环氧树脂体系的性能做了分析。     

TDE-85环氧树脂丙烯酸酯的合成及其UV固化特性的研究

本文研究了TDE-85环氧树脂丙烯酸酯的合成方法，讨论了合成条件（催化剂的种类与用量，反应温度及时间，投料比，反应类型及不饱和酸种类的选择等）对合成反应及合成产物性状的影响。另外，还考察了该合成产物的UV固化特性。     

水性聚氨酯/丙烯酸酯复合乳液的合成及其性能研究

通过自由基乳液聚合,合成具有核壳结构的水性聚氨酯/丙烯酸酯复合乳液(PUA)。用IR、DSC和TEM对产物结构进行了表征,证明水性聚氨酯(PU)与丙烯酸酯单体在实验条件下发生了共聚反应;考察了PVA乳液及其胶膜耐热性和耐溶剂性。结果表明具有核壳结构的PUA乳液的各项性能均比水性聚氨酯有明显提高。     

有机硅/丙烯酸酯共聚物乳液性能的研究

采用反应型乳化剂烷基乙烯基磺酸钠 ( DNS-86)合成了有机硅改性丙烯酸酯共聚乳液 ,考察了乳液的表面张力、稳定性及流变性能。结果表明硅丙乳液的表面张力随有机硅单体用量的增加而减小 ;乳液的冻融稳定性和储存稳定性良好 ,符合涂料的使用要求 ;乳液为非牛顿流体 ,乳液的表观黏度随着有机硅含量的增加而降低。     

Analysis of sequence distribution in methyl methacrylate-methyl acrylate copolymers by C NMR spectroscopy

Methyl methacrylate (MMA)-methyl acrylate (MA) copolymers, prepared in bulk at 50 °C using AIBN as initiator, were characterized by 150 MHz ¹³C NMR spectroscopy, including use of the Distortionless Enhancement by Polarization Transfer (DEPT) experiment to obtain methylene and methine carbon resonances as subspectra. Dyad, triad, tetrad and partial pentad distributions were measured from the α-methyl, methine and methylene carbon resonances. These were in good agreement with distributions calculated for the copolymers based on monomer feed compositions, conversions and reactivity ratios of 2.60 and 0.27 for methyl methacrylate and methyl acrylate, respectively.     

多羟甲基酚多丙烯酸酯的合成及其耐温性能研究

本文合成了新型耐温活性预聚体多羟甲基酚多丙烯酸酯,并考察了pH值,丙烯酸量,反应时间、反应温度、催化剂用量等因素对反应产率的影响。测试了固化物的TCA和DTA及力学性能,并用红外光谱确认主产物。     

原位聚合改性交联LLDPE介电性能的研究

利用原位聚合聚丙烯酸钠(PNaAA)改性交联聚乙烯,增加聚乙烯的极性。采用FTIR和DSC表征了原位聚合后交联聚乙烯的结构形态。讨论了PNaAA、DCP用量对体系力学性能、介电性能的影响,结果表明:随着PNaAA用量的增加,体系拉伸强度略有增加,断裂伸长率下降,体积电阻率随PNaAA用量增加而变小;随着DCP用量的增加,拉伸强度出现一个最大值后开始下降,体系断裂伸长率随DCP用量的增加而下降。从体系组成及分子结构方面分析了介电性能随PNaAA用量增加而变化的原因。     

快速高吸油性丙烯酸酯树脂的合成研究

以丙烯酸丁酯与甲基丙烯酸甲酯为共聚单体，在聚合体系中引入致孔剂和大分子增容剂，采用悬浮聚合法合成了快速高吸油性树脂，考察了致孔剂用量、增容剂用量、乙酸乙酯／异戊醇混合致孔剂质量比等对高吸油性树脂吸油性能的影响。结果表明：通过引入致孔剂乙酸乙酯，不仅使树脂对甲苯和汽油的吸油率分别达到了3300％和1000％，而且吸油速度加快，2h内可达到饱和吸油；在致孔的基础上引入增容剂，可使树脂对汽油的吸收率显著提高，达到了1500％。     

反应性乳化剂应用于丙烯酸酯类乳液压敏胶的研制

使用正交试验法设计压敏胶配方,得到用反应性乳化剂参与的AA、HEA、BA和EA、M AA等多元共聚物乳液,研究该聚合物应用于压敏胶的初粘、持粘、剥离强度等力学性能。结果表明,在该体系下引发剂用量、反应温度、AA、反应性乳化剂用量对压敏胶乳液综合性能关系密切,其它各因素影响不明显。得到的优化配方为BA(83%)、AA(1%)、HEA(1%)、MM A和EA的混合单体(15%)。