聚烯烃中抗氧剂330的快速分析方法研究

研究了红外光谱法定性定量分析聚乙烯、聚丙烯中的抗氧#1330。分析了抗氧剂330和PE、PP粉料的FT-IR图,确定了抗氧剂330在聚乙烯、聚丙烯中的特征吸收峰分别为1152cm^-1,3650cm^-1。详细分析了抗氧剂330分别与定量的PE、PP及硬脂酸钙所制样品对所测谱图和所制曲线的影响。抗氧剂330的标准曲线表明,抗氧剂330的含量与其特征峰的吸收强度呈良好的线性关系,相关系数达0．97以上,相对百分偏差最大为11．765％。     

红外光谱法定性和定量分析聚烯烃中抗氧剂3114

研究了用红外光谱（IR）法定性和定量分析聚烯烃（聚乙烯、聚丙烯）中的抗氧剂3114的方法和准确度。分析了抗氧剂3114和PE、PP粉料的FTIR图,确定了抗氧剂3114在聚烯烃中的特征吸收峰为1695cm^-1,详细分析了不同含量抗氧剂3114的PE、PP样品的红外谱图和测试的准确度,同时根据抗氧剂3114的标准曲线可知,抗氧剂3114的含量与其特征峰的吸收强度呈良好的线性关系,相关系数达0．97以上,相对百分偏差最大为9．524％。表明红外光谱法可定性和定量分析聚乙烯、聚丙烯中的抗氧剂3114。     

聚丙烯中抗氧剂168含量的定量分析

利用红外光谱法(FTIR)快速测定聚丙烯(PP)中抗氧剂168的含量,分别得到PP/(抗氧剂168和PP/抗氧剂1010(定量)+抗氧剂168)中抗氧剂168含量与其特征吸收峰面积的标准曲线,其相关系数均大于0.99。结果表明:样品中抗氧剂168的计算值与测量值相对误差都不超过7%,该方法基本适用于实际检测的需要。     

聚丙烯中抗氧剂3125的定量分析及应用

经混炼机混料,得到聚丙烯(PP)/抗氧剂3125和PP/抗氧剂3125/抗氧剂168(定量)2个体系。利用红外光谱法测定2个体系中抗氧剂3125特征吸收峰面积,并由特征吸收峰面积与含量的关系拟合方程,得到相关系数均大于0.98的标准曲线,经置信度检验,相对误差小于8%,能满足实际检测的需要。     

波长色散型X荧光仪对PE中抗氧剂168含量的检测

使用波长色散型X射线荧光光谱仪,对聚乙烯中抗氧剂168含量进行测定与分析,提取抗氧剂168含量的方法需要使用聚乙烯反应器粉料,根据试验需要提取出不同含量的抗氧剂168,在乙醚溶剂中与聚乙烯粉料均匀混合后,使用熔融压片法制得标准样品,并使用波长色散型X射线荧光光谱仪和专用软件绘制出标准的曲线图,通过标准曲线图对样品进行测量,可以得到聚乙烯中抗氧剂168的具体含量。聚乙烯熔融压片制作样品的方法可以从样品制备、绘制曲线、参数优化以及测定结果等方面得到具体数据,得出后使用波长色散型X射线荧光光谱仪对聚乙烯中抗氧剂168含量进行测定。取代液相色谱测量法和紫外可见分光光度测量法等方法,使用该方法测定的数据准确,具有较好的精密效果,能够得到应用和发展。     

PE微观结构的红外光谱实用表征

利用傅里叶变换红外光谱(FTIR)研究了多种类型以及与不同α-烯烃共聚合的聚乙烯(PE),发现采用FTIR差谱技术可对共聚PE的结构类型定性分析。通过比较甲基1378cm^-3处和亚甲基1369cm^-3处的峰强以及比较不饱和基团在908cm^-1和888cm^-1处的峰强．并分析700～900cm^-1的支链吸收峰．可分别获得判断PE类型及共聚PE结构的信息。此外,通过测算l378cm^-1处的峰强．建立了共聚PE支化度的定量分析曲线。     

红外法快速测定聚丙烯中抗氧剂的含量

介绍了用FTIR法测定聚丙烯中抗氧剂含量的方法。采用外标法,分析确定了波数为1 682 cm-1作为抗氧剂A的特征峰,该处基本上不受聚丙烯和其它添加剂的出峰干扰,抗氧剂的含量与其红外吸收峰的强度在实验浓度范围内有良好的线性关系,相关系数达0.997。用标准曲线测定了未知样中抗氧剂A含量,抗氧剂A的相对误差小于4.5%。此方法为确定聚丙烯生产装置中抗氧剂的加入量及监控产品质量提供了新的分析测试手段,制样、测试简单方便、准确,有很好的推广价值和应用前景。     

差式扫描量热仪在塑木原料检验控制中的应用

为了能够有效地计算出混合塑料粒子中各成分含量,本文采用差式扫描量热法,针对高密度聚乙烯(HDPE)和聚丙烯(PP)混合体系、HDPE和低密度聚乙烯(LDPE)混合体系、HDPE,PP及木粉的混合体系的吸热速率曲线进行采集,分析了各曲线的熔点、峰温、焓变以及变化趋势和关系。结果表明:不同类别牌号的成分呈现出不同的DSC HDPE成分特征峰外延终止温度高,峰温在140℃附近,PP成分熔点高,峰温在170℃附近。体系中PP含量为混合体系曲线中PP峰与纯体系曲线中PP峰的焓变比值;聚乙烯(PE)含量可根据其整体焓变值来估算出在体系中的比例。     

聚丙烯粉料乙烯含量测定影响因素研究

利用外商提供的分析方法和一系列标样样片,建立了无规和抗冲共聚聚丙烯中乙烯含量测定的工作曲线,由于聚丙烯粉料样品结构与性质的不稳定性和不均匀性,决定了实际粉料样品乙烯含量在测试处理上往往不能完全与建立标线处理上的一致。通过选取不同牌号乙丙共聚聚丙烯粉料样品,着重试验分析了热压制样中冷却方式、抗氧剂、样品粒径对粉料乙烯含量测定结果的影响。结果表明,热压制样中冷却方式对粉料乙烯含量的测定结果形成了较为明显的影响;同样粉料样品中是否添加抗氧剂及所加抗氧剂的种类对测定结果也构成了很大程度的影响;另外,粉料样品粒径对乙烯含量的测定结果形成了显著的影响。     

聚乙烯中几种已知助剂的红外光谱分析

采用傅里叶变换红外光谱(FTIR)法对聚乙烯中的3种已知助剂进行了定性剖析,通过对比单一助剂、聚乙烯粉料、助剂与聚乙烯粉料共混样品的红外谱图,确定了助剂在聚乙烯中的特征吸收峰。以抗氧剂A为例,通过溶液预混再造粒的方法,配置了一系列含有不同质量分数抗氧剂A的聚乙烯标准样品,依据朗伯-比尔定律,建立了聚乙烯中抗氧剂A的定量分析标准曲线,方程为y=0.025 8x-0.014 7,相关系数R²=0.998 5,当抗氧剂A质量分数较小时,红外响应值较弱,误差较大,当抗氧剂A质量分数大于0.100 0%时,测试结果的相对误差和相对标准偏差均在5%以内,能够满足科研生产分析需求。     

聚烯烃封装胶膜的热氧老化性能研究

文章通过添加抗氧剂1010和168,改善POE的热氧老化性能。通过测试材料老化前后的力学性能、透过率、黄色指数以及红外分析,来研究交联POE的热氧老化体系。研究发现,通过添加0.1%不同的抗氧剂后,将老化前后聚烯烃胶膜性能进行对比,发现未加任何抗氧剂的聚烯烃封装胶膜老化500 h后,其红外谱图在1724 cm-1、1666 cm-1、1589 cm-1、1261 cm-1出现了新的基团峰,这说明老化过程中可能有双键、酮基、羧基生成。而添加抗氧剂含量为168∶1010=4∶1的试样,其变化最小,表明此时的抗热氧老化效果最佳。     

Effects of silane on the properties of wood‐plastic composites with polyethylene‐polypropylene blends as matrices

The influence of 3‐(trimethoxysilyl)propyl methacrylate and benzoyl peroxide on gel content, crystallinity, and mechanical performance of unfilled PP‐PE blends, and their composites with wood was investigated. All materials were compounded in a twin screw extruder and then injection molded. Specimens were then exposed to high‐humidity and elevated temperature in a humidity chamber to cross‐link any unhydrolyzed silane. Adding wood to the PE‐PP blends, increased premature cross‐linking but also increased gel contents. However, the gel contents of the composites were still low. The PP component did not appear to cross‐link well and our gels were almost entirely HDPE. Fourier Transfer Infrared (FTIR) spectra provided additional evidence that TMSPM is grafted and cross‐linked in unfilled PE‐PP blends. Unfortunately, the spectra of wood composites proved difficult to interpret because of the complexity and overlap of the FTIR spectra of the wood. The HDPE component annealed when exposed to high‐humidity and elevated temperature, although less so in samples with high‐gel contents, presumably because of the decreased mobility. Annealing influenced mechanical performance, especially increasing moduli. Adding peroxide and silane appeared to improve adhesion between the wood flour and matrix in the composites but had little effect on energy absorbed during high‐speed puncture tests. Published 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Applications of rheological torque–time curves to the study of thermooxidative degradation of polypropylene powder

The torque–time curves of polypropylene (PP) powder treated under various thermooxidative degradation conditions were obtained through processing in the mixing chamber of a rheometer. Meanwhile, the Fourier transform infrared (FTIR) spectra of the corresponding samples were determined, and the quantitative analysis of the carbonyl indices of the FTIR spectra of the samples of the PP powder was carried out to provide evidence for the rheological characterization. PP granules, to which an antideteriorant was added before they were commercially supplied so good antidegradation could be achieved, was investigated for the sake of contrast. The analysis of the experimental results showed that the height of the torque–time curve of the PP powder and the corresponding value of the equilibrium torque could be used to characterize or evaluate the variations of the thermooxidative degradation of the PP powder. Under the same processing conditions, the heights of the torque–time curves of the PP powder and the corresponding values of the equilibrium torque decreased with the enhancement of the thermooxidative degradation treatment before mixing; on the contrary, the heights and areas of the characteristic bands of the carbonyl groups in the FTIR spectra of the PP powder and the corresponding values of the carbonyl index increased. The quantitative analysis of the FTIR spectra provided evidence for the conclusion that the heights of the torque–time curves of the PP powder and the corresponding values of the equilibrium torque could be used to characterize or evaluate the thermooxidative degradation of the PP powder. If the treatment under thermooxidative degradation conditions weakened or the degradation of the PP powder just began (i.e., in the viscosity range for processability), the evaluation method using the heights of the torque–time curves of the PP powder or the corresponding values of the equilibrium torque could provide more sensitivity than the method using the values of the carbonyl index. Consequently, the method using the heights of the torque–time curves to evaluate the thermooxidative degradation of the PP powder had its advantages. The application of the torque–time curves could be used to evaluate not only the variation of the thermooxidative degradation of the PP powder treated under aging conditions before mixing but also the variation of the degradation, including the mechanochemical degradation, of the PP powder during the period of mixing. The dependence of the variation of the degradation of the polymer on the processing time during mixing could be evaluated by the study of the variation of the torque–time curves. It can be concluded that the application of torque–time curves to the evaluation of degradation of PP powder has the advantages of being convenient, real‐time, in situ, online, and production‐oriented. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

新型三元复配抗氧体系的设计及其在煤基均聚PP中的应用

设计了一系列由主抗氧剂、辅助抗氧剂、碳自由基捕捉剂组成的不同种类、不同配比抗氧剂体系,并将其用于煤基均聚聚丙烯（PP）的抗热氧老化性能改性中。其中以巴斯夫抗氧剂 Irganox®1010、Irgafos®168主辅抗氧剂质量比1∶1为对比基准,通过测试并对比添加新型三元复配抗氧体系改性 PP的氧化诱导时间（OIT）、黄色指数、熔体流动速率、力学性能等性能指标,从而开发煤基均聚PP的最佳耐热氧老化助剂配方。结果表明,当主抗氧剂为Irganox®1010、辅抗氧剂为 Irgafos®168质量比为 1∶1并与羟胺类抗氧剂 Revonox®420复合使用时,改性 PP的 OIT最长为 9. 8 min,黄色指数为 1. 3,熔体流动速率为 10. 7 g/10 min,综合性能最佳;当主抗氧剂为 Irganox®1010、辅抗氧剂为 Irgafos®168质量比为1∶2时,改性PP的抗黄变效果最好,由此设计并优化的抗氧剂体系及其配比对煤基均聚PP的耐长期热氧老化 改性配方设计具有重要的启示。     

泥煤吸附镍前后的傅立叶变换红外光谱

在不同pH下泥煤多次吸附镍,用傅立叶变换红外光谱（FTIR）研究了泥煤与镍元素作用前后的光谱特征．结果表明,pH对泥煤的影响较大;泥煤的红外光谱与腐植酸相似;泥煤与镍元素结合后的红外光谱中归属于1711cm^-1的羧酸二聚体吸收峰减小甚至消失,同时归属于COO^-的1610cm^-1和1410cm^-1处的振动吸收增强,说明泥煤中的羧基与镍离子发生了配合作用,旦大部分是双齿结构．     

复合抗氧剂在煤基聚丙烯中的应用研究

分别采用不同质量比的1010和168复合抗氧剂、硬脂酸钙制备出一系列煤基PP S1003,通过不同温度下氧化诱导期(OIT)测试、多次挤出熔体流动速率测试、黄色指数YI测试等对S1003中的热氧稳定性、加工稳定性进行了分析研究.结果表明,随着主辅协同抗氧剂体系当中1010含量的提升,抗氧剂所稳定S1003体系相同温度下...     

Kinetics of thermo-oxidative degradation of zinc borate/microcapsulated red phosphorus with magnesium hydroxide in flame retarded polypropylene composites

The flammability and the thermo-oxidative degradation kinetics of zinc borate (ZB) and microcapsulated red phosphorus (MRP) with magnesium hydroxide (MH) in flame-retardant polypropylene (PP) composites were studied by limiting oxygen index (LOI), TGA, and FTIR spectroscopy. The results show that ZB/MRP is a good synergist for improving the flame retardancy of the PP composites. The Kissinger and Flynn-Wall-Ozawa methods were used to determine the activation energy (E) for degradation of PP composites. The results from the TGA curves indicate that the thermal stability of PP/MH/ZB and PP/MH/ZB/MRP composites is better than that of PP/MH composites. The kinetic results show that the values of E for degradation of PP/MH/ZB/MRP composites is much higher than those of PP/MH and PP/MH/ZB composites. The FTIR spectra data show that the incorporation of MH improves the thermo-oxidative stability of PP, especially for PP/MH composites with suitable content of MRP at higher temperatures. These data indicate that the synergistic flame retardants used in this work have a great effect on the mechanisms of pyrolysis and combustion of PP/MH composites.     

星形受阻酚抗氧剂的抗氧化性能研究

利用星型聚合物的端基可以进行功能基转化这一特殊性能,将具有抗氧化性能的化合物β-（3,5-二叔丁基-4-羟基苯基）丙酰氯引入到以氨为核的低代聚酰胺-胺（PAMAM）星型高分子上,合成了一种星型受阻酚抗氧剂,研究了该星型抗氧剂对线形低密度聚乙烯（PE-LLD）和聚丙烯（PP）的抗氧化作用。结果表明,该抗氧剂在2种聚烯烃材料中均具有良好的加工性能和抗氧化性能,在PE-LLD 中的氧化诱导期为市售抗氧剂1010的1.3倍、抗氧剂3114的1.4倍,在PP中的抗氧化性能与这2种抗氧剂相当;添加该星型抗氧剂可使PE-LLD的拉伸强度和断裂伸长率分别从12.6 MPa和652 %升高到17.9 MPa和696 %,使PP的拉伸强度和断裂伸长率分别从36.9 MPa和182 %升高到40.0 MPa和248 %;经25 min塑炼后,添加该星型抗氧剂的PE-LLD和PP的熔体流动速率变化很小。