国外文献摘要

正聚丙烯基树脂组合物和发泡片材提供了一种聚丙烯基树脂组合物具有均匀细小的细胞从一个发泡片材、热成型热成型,外观良好,耐冲击,重量轻、刚度、耐热性、保温性能、耐油等可以产生。聚丙烯基树脂组合物包括(X)5重量%至99重量%的具有长支链结构的聚丙烯树脂,和(Y)1重量%至95重量%基于丙烯的嵌段共聚物的连续聚合生产,其中嵌段共聚物包括(Y-1)丙烯(共)聚合物     

抗氧剂PEPQ对聚丙烯加工稳定化的影响

研究了抗氧剂PEPQ对聚丙烯(PP)树脂的抗氧化性能,并与抗氧剂168进行了对比。结果表明,添加抗氧剂PEPQ的PP树脂具有良好的加工性能和热稳定性能,经5次反复挤出保持良好的力学性能,拉伸强度保持90%以上,黄色指数YID为0.96。     

聚丙烯基树脂组合物和发泡片材

正提供了一种聚丙烯基树脂组合物具有均匀细小的细胞从一个发泡片材、热成型热成型,外观良好,耐冲击,重量轻、刚度、耐热性、保温性能、耐油等可以产生。聚丙烯基树脂组合物包括(x)5%至99%的具有结构的长支链聚丙烯树脂的重量,和(Y)1%至95%重量基于丙烯的嵌段共聚物的连续聚合生产,其中嵌段共聚物包括(Y-I)丙烯(共)聚合物和(Y-2)一丙烯-乙烯共聚物,该树脂(X)具有性质(X-i)     

可染型聚丙烯纤维的研究

采用高聚物共混改性方法,成功地研制出可染型聚丙烯树脂。并对其热性能、流变性、可纺性及染色性进行了研究。结果表明：可染型聚丙烯树脂具有良好的可染性,可制取分散染料和阳离子染料可染的聚丙烯纤维。     

聚烯烃类弹性体导电复合材料的制备与性能研究

将炭黑(CB)和碳纤维(CF)导电粒子加入到新型聚丙烯弹性体(Vistamaxx)与聚丙烯(PP)基体树脂中,共混制备导电复合材料。通过体积电阻率测试、力学性能测试和加工流变性能测试,得到了体积电阻率最低为0.47Ω.cm,拉伸强度为6.6 MPa,断裂伸长率为250%,具有良好加工性能的导电复合材料。     

防寒用聚丙烯无纺布的人工加速老化试验研究

以自制聚丙烯抗老化母粒和PP树脂为原料,通过纺黏法制备了防寒聚丙烯无纺布,并通过氙灯人工加速老化试验方法对其抗老化性能进行了研究。结果表明,制备的防寒聚丙烯无纺布具有良好的抗老化性能,可满足实际使用要求。     

催化剂形态对β-聚丙烯性能的影响

利用一种球形复合催化剂体系,通过环管聚合工艺直接生产出了具有β晶型的聚丙烯树脂,并与类球形复合催化剂体系所得聚合物进行对比,研究了催化剂形貌对β-晶型聚丙烯树脂结构和性能的影响。结果表明,利用球形催化剂体系所得聚合物β晶分布更为均匀,且聚合物具有良好的球形形态;这种β晶型聚丙烯树脂的室温冲击性能显著优于类球形催化剂所得树脂的,亦明显优于熔融共混方法制备的β晶型聚丙烯树脂。     

高流动高耐热聚丙烯改性树脂的研究

通过添加α成核剂、过氧化二异丙苯(DCP)改善聚丙烯树脂的高耐热性能和高流动性能,并研究了高流动、高耐热聚丙烯改性树脂的流动性能、耐热性能、拉伸性能和结晶形态。结果表明,随着DCP加入量的增大,聚丙烯树脂的MFR值增加,流动性得到提高;随着α成核剂用量的增加聚丙烯树脂的热变形温度随之提高,当用量为0.3%,聚丙烯树脂的热变形温度由130℃提高到145℃。     

用CS－1高效催化剂生产聚丙烯树脂的纺丝试验

研究了用ＣＳ－１高效催化剂生产聚丙烯树脂的纺丝性能，得出采用该催化剂并结合分子量调节剂可以得到熔融指数较大，分子量分布较窄的聚丙烯树脂，其纺丝及力学性能都比较好。     

TMA-3成核剂对高抗冲共聚聚丙烯的改性研究

使用α成核剂TMA-3以及聚烯烃弹性体(POE)改善高抗冲共聚聚丙烯(PPK7726、PPK8003)。结果显示,TMA-3成核剂不管是在高流动共聚聚丙烯树脂中,还是在低流动共聚聚丙烯树脂中,均能在缺口冲击强度没有被降低太多的情况下,加快聚丙烯树脂的结晶速度,适度缩短成型周期,提高制品的延展性、刚性、耐热性,赋予制品良好的表面光泽和刚韧平衡性。TMA-3成核剂与聚烯烃弹性体(POE)配合使用,能在几乎不降低制品冲击性能的前提下,明显改善拉伸性能、弯曲性能、耐热性、尺寸均一性。     

Melt spinning of metallocene catalyzed polypropylenes. II. As‐spun filament structure and properties

The melt spinning of metallocene catalyzed isotactic polypropylene (miPP) resins was investigated. The as‐spun filament properties from six miPP resins were studied with melt flow rates (MFR) between 10 and 100, and a Ziegler–Natta catalyzed isotactic polypropylene (zniPP) resin with a MFR of 35 was studied for a comparison. Generally, as the molecular weight increased the filament density increased, the birefringence decreased, the tensile strength decreased, and the elongation to break increased. As the spinning speed increased, the density, birefringence, tensile strength, and crystalline and noncrystalline orientation functions generally increased. However, the low MFR miPP and the zniPP resin had decreases in the birefringence and tensile strength with an increase of the spinning speed. The miPP resins were found to have breaking tensile strengths up to 50% higher than the zniPP resin at similar spinning speeds. The observed fiber properties were explained based on the nature and orientation of noncrystalline portions of the fibers. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 3237–3247, 2001     

miPP与ziPP的可纺性比较

采用熔融纺丝法 ,比较了茂金属催化聚丙烯 ( mi PP)和齐格勒 -纳塔催化聚丙烯 ( zi PP)切片在相同纺丝条件下的可纺性 ,研究了纺丝条件对其初生纤维结构与性能的影响。研究发现 ,mi PP的可纺性受温度的影响比较大 ,在低温下纺丝性能较好 ;mi PP卷绕丝与 zi PP卷绕丝相比具有良好的可拉伸性能 ;m i PP的相对分子质量分布较窄 ,其初生纤维的取向度较高     

Melt spinning of metallocene catalyzed polypropylenes. I. On‐line measurements and their interpretation

The melt spinning of metallocene catalyzed isotactic polypropylene resins was investigated. The details are presented for on‐line studies performed on six miPP resins with melt flow rates (MFRs) between 10 and 100 and a Ziegler–Natta catalyzed isotactic polypropylene resin with a MFR of 35 for comparison. The on‐line studies indicated that, as the molecular weight and polydispersity increased, crystallization occurred closer to the spinneret at higher crystallization temperatures and under lower spin line stresses. Further, as the spinning speed increased, crystallization occurred closer to the spinneret at higher crystallization temperatures because of increased stress in the spin line. These observations were interpreted in terms of an increased rate of crystallization caused by increased molecular orientation in the spin line with increasing molecular weight and increasing spinning speed. This “stress‐enhanced” crystallization was further interpreted in terms of an increased rate of crystal nucleation. It was further concluded that the narrower molecular weight distribution of metallocene resins was the primary factor that produced differences in the structure and properties of fibers spun from these resins compared to those of Ziegler–Natta catalyzed resins of similar weight‐average molecular weight or MFR. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 3223–3236, 2001     

PEB在丙纶细旦短纤维制备中的作用

成纤聚丙烯由于较高的分子量.熔体可编性较差。因此，纺丝时容易降解，不但引起纤维机械性能下降.而且使纺细旦纤维变得几乎不可能.本研究通过在纺丝前将PP和PEB均匀混合，纺丝条件大大改善，纤维的强伸度有明显提高。当添加量为0.3％～0.4％时纤维强度可提高5％左右。     

超高分子质量聚丙烯冻胶纤维的结晶性能研究

采用冻胶纺丝法制备超高分子质量聚丙烯纤维（UHMWPP）,并在不同的拉伸温度下对其进行拉伸。研究了在相同的拉伸倍率下,拉伸温度对UHMWPP纤维结晶性能、热性能的影响。结果表明：UHMWPP纤维结晶晶体间存在很多间隙;纤维的结晶性能和耐热性能都随拉伸温度的提高而提高。     

Dynamic Mechanical Thermal Analysis and Rheological Properties of Synthesized Polypropylene Reactor Blends Using Homogeneous Binary Metallocene Catalyst

A homogenous binary metallocene catalytic system comprising of isospecific rac-Me₂Si(2-Me-4-Ph In)₂ZrCl₂(I) producing high molecular weight isotactic polypropylene and oscillating (2-Ph In)₂ZrCl₂(II) precursor producing low isotactic elastomer polypropylene at three varying molar ratios of two types of catalysts was used to synthesize polypropylene reactor blends. Dynamic mechanical thermal analysis and rheological properties along with molecular weight of synthesized polypropylene reactor blends were studied and correlations among these properties were established. It was found that molar ratio of catalysts is a significant factor in determination of molecular weight and its distribution. The produced polymers with unimodal molecular weight distribution showed intermediate modulus during dynamic mechanical thermal experiment, while the ones with bimodal molecular weight distribution exhibited a kind of phase separation at low temperature. Depending on strength of the developed structures, determined by the presence of interfacial connectors, the modulus could be adjusted. Origins of other types of relaxations and their differences for each type of the developed products were discussed in detail. From rheological results and particularly the relaxation curves, the characteristics of the chain structure of the synthesized reactor blends could be resolved. It was revealed that one of the synthesized polymers had long chain branches unlike the rest of the samples having linear chain structure.     

Characterization and property correlations of amorphous poly(alpha olefin)

Amorphous poly(alpha olefins)® (APAOs) with various types and contents of comonomers, and molecular weight were characterized by general, thermal, rheological, and mechanical methods and their properties were correlated with their molecular parameters. It was found that they can be used as a modifier for isotactic polypropylene. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007     

Effects of compatibilizers on the properties of polyamide/polypropylene blends

Compatibilization of polyamide 6/isotactic polypropylene blends was investigated by mechanical, morphological, thermal, and rheometrical methods. The primary objective was to obtain blends combining the desirable properties of the two components. Four compatibilizers including maleic anhydride, fumaric acid, or glycidyl functionalities were applied at two concentrations (5 and 10%). Maleic anhydride grafted styrene-ethylene-butylene-styrene block copolymer (SEBS-g-MAH) was observed to give excellent mechanical properties, especially at high polyamide/polypropylene ratios. The correlation between morphology and mechanical and rheological properties is discussed, and the interesting effect of blending on the kinetics of crystallization is noted.     

异形细旦抗静电丙纶高速纺丝研究

采用抗静电剂与PP二次混合、异形、细旦纺丝技术结合 ,选择复配抗静电剂体系 ,添加质量比为0 .7%左右 ,共混纤维的抗静电效果优良。通过流变性能的测试 ,拟定了主要的纺丝工艺 ,分析了纺丝温度、纺丝速度、单丝线密度等参数对纤维结构和性能的影响     

低等规聚丙烯的研制Ⅰ.低等规聚丙烯的微观结构和性能

采用低等规聚丙烯催化剂制得ＬＩＰＰ,并测定其微观和性能结果表明。ＬＩＰＰ是短距有序长距无序的等规和少量间规立体嵌段均聚物,其性能与高等规聚丙烯和副产无规聚丙烯有较大的差别。