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Synthesis of poly(acrylic-co-itaconic acid) through precipitation photopolymerization for glass-ionomer cements: Characterization and properties of the cements.
Dental Materials ( IF 5 ) Pub Date : 2020-04-16 , DOI: 10.1016/j.dental.2020.03.006
Raz Abbasi 1 , Azizollah Nodehi 1 , Mohammad Atai 1
Affiliation  

OBJECTIVE The aim of this study was to synthesize poly(acrylic acid-co-itaconic acid) (PAA-co-PIA) ionomer through a novel precipitation photopolymerization technique. The ionomer was characterized and the effect of its structural parameters, such as molecular weight and copolymer composition were investigated on the mechanical properties of glass-ionomer prepared using the ionomer. METHODS Design of experiment (DOE) was used to examine the effect of monomer ratio and the amount of chain transfer agent on the molecular weight and final conversion of the ionomers synthesized through the precipitation photopolymerization. The copolymer compositions were identified using FTIR and 1H-NMR spectroscopy. The molecular weights of the copolymers were evaluated by GPC. A series of PAA-co-PIA copolymers were then synthesized via the photopolymerization technique in three monomer ratios and two molecular weight ranges (high and low) to study the properties of the glass ionomers thereof. Experimental dental glass-ionomer cements were prepared by mixing the synthesized polymers with glass powder and their compressive properties were determined according to ISO 9917-1:2007 after storing for 0, 1, 7 and 28 days in distilled water. The scanning electron microscopy (SEM) was used to study the fracture surface morphology of the cements. RESULTS The PAA-co-PIA polymers were synthesized by the photopolymerization method in a short time and high purity. The DOE showed that by decreasing the acrylic acid/itaconic acid ratio and increasing the amount of transfer agent, the molecular weight and final conversion decreased significantly. By increasing the itaconic acid content in the copolymer composition and increasing the molecular weight in a constant copolymer composition, the compressive strength and modulus were increased. Microstructures revealed that cements made of the higher molecular weight poly acids showed lower cracks and voids. SIGNIFICANCE The precipitation photopolymerization technique provides a promising and facile method in the synthesis of ionomers which are used in dental cements and other application.

中文翻译:

玻璃-离聚物水泥的沉淀光聚合合成聚丙烯酸-衣康酸:水泥的表征和性能。

目的本研究的目的是通过一种新颖的沉淀光聚合技术合成聚丙烯酸-衣康酸(PAA-co-PIA)离聚物。对该离聚物进行了表征,并研究了其结构参数(如分子量和共聚物组成)对使用该离聚物制备的玻璃离聚物的机械性能的影响。方法采用实验设计(DOE)研究单体比和链转移剂的用量对通过沉淀光聚合法合成的离聚物的分子量和最终转化率的影响。使用FTIR和1H-NMR光谱鉴定共聚物组成。通过GPC评估共聚物的分子量。然后通过光聚合技术以三种单体比例和两个分子量范围(高和低)合成了一系列PAA-co-PIA共聚物,以研究其玻璃离聚物的性能。通过将合成的聚合物与玻璃粉混合制备实验性牙科玻璃离聚物胶粘剂,并在蒸馏水中储存0、1、7和28天后,根据ISO 9917-1:2007确定其压缩性能。用扫描电子显微镜(SEM)研究了水泥的断裂表面形态。结果PAA-co-PIA聚合物是通过光聚合法在短时间内,高纯度下合成的。DOE显示,通过降低丙烯酸/衣康酸的比例并增加转移剂的数量,分子量和最终转化率明显降低。通过增加共聚物组合物中衣康酸的含量并增加恒定共聚物组合物中的分子量,可提高抗压强度和模量。微观结构表明,由较高分子量的多元酸制成的水泥显示出较低的裂缝和空隙。意义沉淀光聚合技术为合成用于牙科水泥和其他应用的离聚物提供了一种有前途且简便的方法。微观结构表明,由较高分子量的多元酸制成的水泥显示出较低的裂缝和空隙。意义沉淀光聚合技术为合成用于牙胶和其他应用的离聚物提供了一种有前途且简便的方法。微观结构表明,由较高分子量的多元酸制成的水泥显示出较低的裂缝和空隙。意义沉淀光聚合技术为合成用于牙科水泥和其他应用的离聚物提供了一种有前途且简便的方法。
更新日期:2020-04-16
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