摘要
以甲基丙烯酸甲酯(MMA)、丙烯酸异辛酯(2-EHA)、丙烯酸(AA)和丙烯酸羟基乙酯(HEA)为共聚单体,以偶氮二异丁腈(AIBN)为引发剂,乙酸乙酯(EA)为溶剂,通过自由基聚合反应合成了丙烯酸酯聚合物。然后接枝丙烯酸异氰基乙酯(AOI)单体,合成了丙烯酸酯预聚物,并用于制备UV固化型压敏胶(PSA)。研究了其结构性能以及反应温度对预聚物的相对分子质量及分布的影响、低用量的功能单体AA和交联单体AOI以及重均分子量(M_(w))对PSA性能的影响。研究结果表明:(1)红外光谱分析说明,预聚物和单体几乎全部参与聚合反应。相对分子质量及分布分析表明,质均分子量(M_(n))和重均分子量(M_(w))随着反应温度的升高而降低,但分布系数(PDI)保持在3.56~3.79之间,PDI的变化和温度没有明显对应的关系。DSC分析测定T_(g)为-63.53℃,远低于其他研究报道PSA的T_(g)(-30~-50℃),可适用温度下限显著降低。(2)综合考虑,AA和AOI的用量分别为1.0%和0.16%,且预聚物的M_(w)约为45.7万时,PSA的综合性能相对最佳。不同频率下的流变性能解释了压敏性能与黏弹性的内在关系。
Acrylate polymer was synthesized through free radical polymerization using methyl methacrylate(MMA),isooctyl acrylate(2-EHA),acrylic acid(AA),and hydroxyethyl acrylate(HEA)as comonomers,azobisisobutyronitrile(AIBN)as initiator,and ethyl acetate(EA)as solvent.Then,acrylate prepolymer was systhesized by grafting isocyanate ethyl acrylate(AOI)monomer,which was used to prepare UV curable pressure sensitive adhesive(PSA).The effects of structural properties and reaction temperature on the relative molecular weight and distribution of prepolymers,as well as low dosages of functional monomer AA and crosslinking monomer AOI,and weight average molecular weight(M_(w))on PSA performance were investigated.The research results showed that,(1)Infrared spectroscopy analysis showed that almost all prepolymers and monomers participated in the polymerization reaction.The analysis of relative molecular weight and distribution showed that the mass average molecular weight(M_(n))and weight average molecular weight(M_(w))decreased with the increasing reaction temperature,but the distribution coefficient(PDI)remained between 3.56~3.79,and there was no obvious correlation between the change of PDI and temperature.The T_(g)determined by DSC analysis was−63.53℃,which was much lower than the T_(g)of PSA reported in other studies(-30~−50℃),and the applicable temperature lower limit was significantly reduced.(2)Overall,when the dosage of AA and AOI was 1.0%and 0.16%,respectively,and the M_(w)of prepolymer was about 457,000,the comprehensive performance of PSA was relatively optimal.The rheological properties at different frequencies explained the intrinsic relationship between pressure-sensitive performance and viscoelasticity.
作者
黄毅
蔡捷鸿
张溢辉
褚曰环
王林格
Huang Yi;Cai Jiehong;Zhang Yihui;Chu Yuehuan;Wang Linge(School of Emergent Soft Matter,South China University of Technology,Guangzhou 510640,Guangdong,China;Polomo New Material Technology Development Co.,Ltd.,Dongguan 523185,Guangdong,China;School of Chemistry and Materials Engineering,Huizhou University,Huizhou 516007,Guangdong,China)
出处
《中国胶粘剂》
CAS
2024年第10期31-37,共7页
China Adhesives
基金
惠州学院教授、博士启动项目“掺杂功能物质的PVA纤维的制备与性能研究”(2022JB013)
惠州学院横向科研项目“具有UV阻隔功能的光学透明胶(OCA)产品的研发与产业化”
惠州学院横向科研项目“优比贝柠橡塑材料研发平台的搭建与运营方案编制”(2022HX148)。
关键词
丙烯酸酯预聚物
压敏胶
交联单体
丙烯酸
黏弹性
acrylate prepolymer
pressure sensitive adhesive
crosslinking monomer
acrylic acid
viscoelasticity
