丙烯酸

Their infrared spectrum changes under UV-irradation and in the heating process have been monitored by ATR-FTIR. Then the aging mechanism has been induced by the infrared spectra before and after aging and their difference spectra. In the condition of UV-irradiation, the polyurethanes degrade to quinoid structures or azo-compounds, which is why polyurethanes' color can easily become yellow.

在紫外线照射下，聚氨酯类有机高分子涂料降解生成偶氮化合物或醌式结构，这也是聚氨酯老化颜色易变黄的原因；丙烯酸类有机高分子涂料降解机理为酯基断裂、形成稳定性较好的内酯，同时伴随侧链断裂的反应。

To make the string of hearts, you will need 5 wooden heart cut - outs approximately three inches wide, a drill with an eighth inch bit and a quarter inch bit, a small amount of raffia, two yards of 1 - 1 / 2 inch wide soft ribbon, two large wooden beads, and acrylic paints in the colors you want.

为了使字符串的心，你需要5木心削减-出局大约3英寸宽，演习的第八届英寸位和25英寸位，少量的拉菲草，二码1 - 1 / 2英寸宽软带，两个大木头珠，和丙烯酸涂料中所要的色彩。

The system propazine: methacrylic acid was used as a model for the preparation of molecularly imprinted fibers, and its ability to selectively rebind triazines was evaluated.

2-氯-4，6-二-1，3，5-三嗪系统：用甲基丙烯酸做模型制备分子印迹纤维，并对其选择性吸附三嗪化合物的能力进行评估。

The system propazine: methacrylic acid was used as a model for the preparation of molecularly imprinted fibers, and its ability to selectiely rebind triazines was ealuated.

2-氯-4，6-二-1，3，5-三嗪系统：用甲基丙烯酸做模型制备分子印迹纤维，并对其选择性吸附三嗪化合物的能力进行评估。

Such a strategy is based on the direct synthesis of molecularly imprinted polymeric fibers using silica capillaries as molds, with silica being etched away after polymerization. The system propazine: methacrylic acid was used as a model for the preparation of molecularly imprinted fibers, and its ability to selectively rebind triazines was evaluated.

这种技术以二氧化硅毛细管为模型直接合成分子印迹聚合纤维，聚合完成后除去二氧化硅。2-氯-4，6-二-1，3，5-三嗪系统：用甲基丙烯酸做模型制备分子印迹纤维，并对其选择性吸附三嗪化合物的能力进行评估。

Polymethyl methacrylate is the most used filling materials at present; There is not significant difference between unipedicular and bipedicular vertebroplasty; Using vertebral body venography and appropriate dense bone cement can reduce leakage of bone cement; Bolster for self-replacement can rebound vertebral body height, and balloon kyphoplasty and sky bone expander kyphoplasty can be avoided; In order to reduce refracture of vertebral body, anti-osteoporosis drugs should be used in the treatment of percutaneous vertebroplasty.

聚甲基丙烯酸甲酯是目前最常用的填充物；单侧注射和双侧注射疗效没有明显差别；应用对比剂及掌握合适的骨水泥黏稠度可以减少骨水泥的渗漏率；成形前腰部垫枕自身复位可以恢复椎体的高度，避免采用操作复杂及价格昂贵的球囊后凸成形及骨膨胀椎体后凸成形；进行经皮椎体成形时应该配合应用抗骨质疏松药物，以减少椎体再骨折的发生。

The relationship between water tree growth speed and its influence factors, such as aging time, frequency of electrical field, and relative permittivity, was studied in this paper.

按照建立的水树枝老化试验装置和方法标准，本文对低密度聚乙烯和聚甲基丙烯酸甲酯两种固体片状材料进行了水树枝老化规律的试验研究，重点研究了低密度聚乙烯材料中水树枝引发和发展的影响因素和规律，包括盐溶液的浓度对低密度聚乙烯中水树枝形态的影响，老化时间、外施电压频率、盐溶液的电容率与水树枝生长速度的关系。

By employing such a method, 5 series of elastomers, including natural rubbers, elastomeric polyester fibers and ethylene-octene, ethylene-methyl acrylate as well as SIS triblock copolymers, were investigated with the purpose of studying elongation induced phase structure and mobility changes of the samples. For NR samples, it was demonstrated that there exists a small amount of crystals at RT even for unelongated samples. For both NR and the soft segment of PEE, with the increase of elongation ratio, the elongation-induced crystallinity increases almost linearly in a certain region of R, in accord with the increase of the lamellar thickness of the crystals; The behavior of ethylene copolymers, in terms of elongation induced morphorpholgy changes, are quite different from NR and PEE. The crystals are found to be gradually destroyed with the increase of R, with accord with the decrease of the lamellar thickness; The motional behavior of the soft segment of SIS, changes from "liquid" to "solid", in terms of 13C NMR spin-lattice relaxation.For many of the aformented samples, the dependence of 13C spin-lattice relaxtion time T1 on R are different for different groups, indicating that the changes of mobility at MHz frequency region with elongation are different for different groups.

通过对天然橡胶、聚醚酯嵌段共聚物、乙烯-辛烯共聚物、乙烯-丙烯酸甲酯共聚物、SIS等高分子弹性体样品聚集态结构和分子运动的研究，获得了一些新的实验结果，如：给出了确切的实验证据，证明了室温下未拉伸的天然橡胶样品中存在着微量的结晶；发现随着拉伸比增加，天然橡胶及聚醚酯样品的软段部分会出现拉伸诱导的结晶，且结晶度在一定范围内呈现近似线性的增加，所形成晶片的厚度也随之逐渐增加；而乙烯共聚物随着拉伸比的增加，原有的结晶会被逐渐破坏，晶片厚度逐渐变薄，结晶中的缺陷逐渐增加；随着拉伸比的增加，SIS中PI软段部分的核磁共振弛豫行为会出现从液态到固态的转变等；在对上述多个体系的研究中，还发现不同基团的自旋-晶格弛豫时间随着拉伸比呈现不同的变化趋势，表明不同基团的高频运动随拉伸比增加有不同的变化规律。

IR, SEM and TEM showed that the encapsulation film, which is composed of poly modified by silane, is a dense reticulation with a thickness of 20~30nm.

IR、SEM和TEM测试结果表明，该有机包覆层由硅烷改性的聚甲基丙烯酸甲酯组成，是一种厚度为20~30nm的致密网状膜。

GD-905-colored acrylic paint used for roller coated aluminum blinds.

GD-905各色丙烯酸氨基烤漆用于辊涂铝合金百叶窗。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。