共查询到20条相似文献,搜索用时 78 毫秒
1.
聚苯乙烯溶液接枝改性研究 总被引:3,自引:0,他引:3
用溶液接枝的方法研究了回收的废聚苯乙烯泡沫塑料的接枝工艺,包括引发剂的用量、反应温度、单体浓度、单体种类、多单体共接枝对废聚苯乙烯泡沫塑料接枝的影响。PS接枝工艺的研究结果为废聚苯乙烯泡沫塑料的再利用提供了理论依据。 相似文献
2.
聚苯乙烯溶液接枝改性研究 总被引:1,自引:1,他引:0
研究了丙烯酸丁酯(BA)、聚苯乙烯(PS)的二甲苯溶液,以过氧化二苯甲酰(BPO)为引发剂制备聚苯乙烯/丙烯酸丁酯接枝物的溶液接枝反应.讨论了接枝对聚苯乙烯性能的影响以及反应单体浓度、引发剂用量等因素对接枝率的影响. 相似文献
3.
4.
以丙烯酸(AA)和丙烯酸丁酯(BA)为共聚单体,采用溶液接枝法对废聚苯乙烯(PS)进行接枝改性制得PS接枝共聚物,然后以PS接枝共聚物的乳液为基料制备改性PS防水涂料。研究了引发剂用量、单体用量、反应温度和反应时间对PS接枝共聚物接枝率的影响,以及填料和增塑剂的用量对改性PS防水涂料性能影响。结果表明,PS接枝共聚物的最佳合成工艺为:PS用量为30 g,溶剂用量为60 mL,引发剂用量为2.2 g,单体用量为20 g,反应温度为85 ℃,反应时间为25 h;向改性PS乳液中填加10 %的填料和4 %的增塑剂制得的防水涂料性能最佳:耐水时间为25 h,耐盐时间为27 h,表干时间为18 min,冲击强度达50 kg·cm。 相似文献
5.
以端羟基聚苯乙烯接枝改性聚二甲基硅氧烷(PS-PDMS)为基胶,加入气相法白炭黑、正硅酸乙酯和二月桂酸二丁基锡,配成脱醇型双组分室温硫化聚苯乙烯接枝改性硅橡胶。研究了PS-PDMS的结构、力学性能和耐高温性能。29Si NMR和1H NMR分析证实,PS-PDMS的结构是以交替排列的Si—O键为主链、侧链为部分甲基被聚苯乙烯取代的接枝共聚物。相比甲基硅橡胶,PS-PDMS硫化胶的力学性能显著提高,耐热性大幅下降。未补强PS-PDMS硫化胶的拉伸强度在2 MPa以上,拉断伸长率在120%以上;气相法白炭黑用量在30份时,PS-PDMS硫化胶的拉伸强度在5 MPa以上;PS-PDMS硫化胶在热质量损失率为5%和20%时的温度分别比甲基硅橡胶低60℃和118℃。 相似文献
6.
7.
以浓度为2.5%的顺丁烯二酸酐乙醇溶液浸泡聚苯乙烯多孔板24 h后,用低温等离子体辐照引发,将顺丁烯二酸酐接枝到多孔板孔的表面.利用表面水接触角测试仪、X射线光电子能谱(XPS)、傅里叶红外光谱(FTIRATR)对其表面进行表征,并用酶标仪测定其在405 nm处空气空白的吸光度,结果表明:处理后的PS表面产生大量的含氧亲水基团,并且处理时间为60 s时,亲水性提高53.8%,吸光度提高31.3%. 相似文献
8.
9.
10.
通过半连续乳液接枝聚合法制备了聚丁二烯(PB)/聚苯乙烯(PS)(质量比)为70/30、50/50和30/70的3种PB接枝PS胶乳,采用傅里叶变换红外光谱(FTIR)表征了接枝产物,考察了PB/PS和聚灰比对改性水泥砂浆减水能力、保水率、力学强度以及吸水速率的影响,并采用扫描电子显微镜表征了胶乳改性水泥砂浆的微观结构。结果表明,在FTIR谱图中,不仅出现了PB特征峰,而且出现了PS吸收峰,苯环为单取代,说明PS接枝到PB主链上;PB/PS为30/70的胶乳改性水泥砂浆的减水作用和抗压强度较强,而保水作用最差,PB/PS为50/50的胶乳改性水泥砂浆的抗折强度较高,吸水速率较缓慢;胶乳改性水泥砂浆中有桥接结构、互穿网络结构以及孔洞结构。 相似文献
11.
LLDPE溶液接枝马来酸酐的研究 总被引:8,自引:1,他引:8
研究了在二甲苯溶剂中,以过氧化二苯甲酰(BPO)为引发剂,线性低密度聚乙烯(LLDPE)接酸酐的反应,采用正交实验方法考察了引发剂用量,单体及PE浓度。反应温度及时间、阻止交联剂的加入量等因素对接枝反应的影响。结果表明,各因素对PE接枝率影响的大小次序是MAH用量,反应温度、阻止交联剂用量、LLDPE浓度和BPO有用量,阻止交联剂的加入可以有铲地防止PE恶性循环 自由基的交联。 相似文献
12.
13.
14.
In this work the fibers of banana, hemp, and sisal are employed as fillers for the formation of wood polymer composites with polystyrene in the different ratios of 40:60 and 45:55 (wt/wt), respectively. These fibers were esterified with maleic anhydride, and the effect of maleic anhydride was studied on absorption of steam and water at ambient temperature in wood polymer composites. Untreated fiber composites show more absorption of steam in comparison to maleic anhydride (MA)–treated fiber composites. The absorption of water increases with the increase in time from 2–30 h in all untreated fiber composites. The maximum absorption of water was found in hemp fiber composites and the minimum in sisal fiber composites. The maleic anhydride esterified fiber composites showed less absorption of water than the untreated fiber composites. Steam absorption in MA treated and untreated fiber composites is higher than the water absorption in respective fiber composites. The wood polymer composites containing low amount of fiber shows less absorption of steam and water at ambient temperature than the composites containing a greater amount of fiber in respective fiber composites. 相似文献
15.
B. Madhusudhan Rao P. Raghunath Rao B. Sreenivasulu 《Polymer-Plastics Technology and Engineering》2013,52(5):967-977
The graft copolymerization of maleic anhydride (MAH) onto a acryloni-trile-butadiene-styrene (ABS) terpolymer was carried out using benzoyl peroxide (BPO) as an initiator and toluene as a solvent. The effects of various parameters such as monomer concentration, initiator concentration, reaction time, and temperature on graft yield were studied. Addition occurs in the butadiene region of the polymer, either by the loss of vinylic hydrogen and subsequent radical formation and addition of monomer or by addition to the double bond. The graft copolymers were characterized by infrared, thermogravirnetric analysis, and differential scanning calorimetry. Thermal stability was improved and T g was increased. 相似文献
16.
17.
The natural fibers (banana, hemp and sisal) and polystyrene (PS) were taken for the preparation of natural fiber polymer composites in the different ratios of 40:60, 45:55, 50:50 and 55:45 (wt/wt), respectively. These fibers were esterified with maleic anhydride (MA) and the effect of esterification of maleic anhydride was studied on surface resistivity and volume resistivity of natural fiber/polystyrene composites. It was found that the untreated fibers composites show more surface resistivity and volume resistivity in comparison to maleic anhydride treated fibers composites. An untreated hemp fibers composite shows maximum surface and volume resistivity while maleic anhydride treated sisal fibers composites show minimum surface and volume resistivity. 相似文献
18.
19.
20.
聚丙烯紫外辐照气相接枝马来酸酐 总被引:7,自引:0,他引:7
在60℃、氮气气氛下,用低能量紫外辐照聚丙烯,进行聚丙烯的气相马来酸酐接枝。红外分析显示,在所选择的实验条件下,马来酸酐已经接枝到聚丙烯的分子链上。用重量法计算了马来酸酐的接枝率。实验结果表明,接枝聚丙烯(PP-g-MAH)的熔体流动速率和马来酸酐的接枝率随紫外辐射时间的增加而增加;紫外辐照时间保持不变,PP-g-MAH的溶体流动速率基本相同。 相似文献