等规聚丙烯的深度氯化及其在涂料中的应用

采用溶液催化氯化工艺对等规聚丙烯（IPP）进行深度氯化，制得氯含量达52％～62％的氯化等规聚丙烯（CIPP）。该氯化等规聚丙烯可代替过氯乙烯、氯化橡胶用于各种防腐涂料，所得防腐蚀涂料具有良好的性能。     

等规聚丙烯增透改性及用茂催化剂生产间规聚丙烯

主要介绍了向等规聚丙烯中添加透明剂来改善等规聚丙烯的光学性能以及用茂催化剂生产高性能间规聚丙烯.     

氯化等规聚丙烯的合成与表征

采用溶液氯化方法,对用固相接枝得到的等规聚丙烯接枝马来酸酐共聚物进行氯化反应,制得氯含量为３０％￣５０％（质量分数）的氯化等规聚丙烯（ＭＣＰＰ）,用ＦＴ－ＩＲ,Ｘ－衍射,ＤＳＣ和＾１３Ｃ ＮＭＲ表征了产物的结构,ＭＣＰＰ树脂可广泛用于印刷油墨和涂料等。     

等规聚丙烯的结晶成核剂

本文介绍了等规聚丙烯α型、β型结晶和成核剂及应用,成核剂与制品透明性、成型收缩、光泽、耐热性能的关系。指出等规聚丙烯的结晶行为对其加工和制品质量及性能关系重大,通过结晶成核剂进行结晶行为改性,可开发高透明、高光泽、耐热、低收缩和后变形小等新品种聚丙烯塑料。     

BOPP专用料等规指数控制因素分析

通过对聚丙烯BOPP专用料等规指数控制影响因素催化剂性能、给电子体浓度、TEAL/DO比、熔融指数、等规指数分析方法等方面进行分析和探讨 ,找到了生产中影响等规指数的主要因素 ,针对BOPP专用料生产过程中出现的问题 ,提出了等规指数控制的关键及应注意的事项     

成核剂对等规聚丙烯透明度及结晶形态的影响

研究了二(对甲氧基苯亚甲基)山梨糖醇和二苯亚甲基山梨糖醇两种成核剂的结晶形态,以及前者对等规聚丙烯结晶形态的影响.结果表明,后者消光环是由于晶片间相互搭接的边界而形成;二者都能形成类似等规聚丙烯的负球晶;少量前者的加入使等规聚丙烯中形成比纯等规聚丙烯“辐条”状球晶小得多的粒状结晶,从而显著提高了等规聚丙烯制品的透明度.     

BOPP专用料等规指数控制因素分析

通过对聚丙烯BOPP专用料等规指数控制影响因素催化剂性能,给电子体浓度、TEAL/DO比,熔融指数,等规指数分析方法等方面进行分析和探讨,找到了生产中影响等规指数的主要因素,针对BOPP专用料生产过程中出现的问题,提出了等规指数控制的关键及应注意的事项。     

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。     

氯化改性等规聚丙烯树脂合成的研究

采用溶液氯化方法,对固相接枝制得的等规聚丙烯接枝马来酸酐共聚物（IPP－g-MA）进行氯化反应,制得氯含量为30％－55％的氯化改性等规聚丙烯（MCPP）。用FT－IR、X光衍射、DSC和^13C NMR表征了产物的结构。MCPP树脂配制的聚丙烯塑料涂料和金属防腐蚀涂料均有很好的性能。     

基于红外光谱法的聚丙烯等规指数定量检测与分析

采用红外光谱法测定聚丙烯等规指数,建立快速测定聚丙烯三单元等规指数、五单元等规指数含量的工作曲线,并对其准确性与精密度进行了评价。结果表明:聚丙烯等规指数可以用998 cm-1处的吸光度与973cm-1处的吸光度比值以及熔体流动速率的对数来测定,存在较好的线性关系。利用该方法得到的聚丙烯等规指数与采用核磁共振法测定的等规指数接近,最大偏差为±0.004,具有较好的准确度与精密度,同时具有分析速度快、操作简便的优点。     

无规聚丙烯在改性沥青的应用

综述了无规聚丙烯在改性沥青中的应用，指出应加快直接合成低等规聚丙烯（LIPP）工业化进程，开发生产LIPP系列产品替代无规聚丙烯，无规聚烯烃，无规α-烯烃聚合物，同时，应从市场需求出发，尽快开展LIPP改性沥青的应用试验和市场开发。     

傅立叶变换红外光谱法鉴别几种纤维材质

采用傅立叶变换红外光谱仪对几种纤维的材质进行了鉴别,经对比红外光谱图,确认了几种纤维的材质为等规聚丙烯。     

Kinetics of non-isothermal crystallization of polyethylene and polypropylene

Differential scanning calorimetry (d.s.c.) data on non-isothermal crystallization of isotactic polypropylene and high-density polyethylene from the melt at different cooling rates were treated in terms of the Ozawa equation. It was found that the crystallization of polypropylene follows the Ozawa equation but in the case of polyethylene the Ozawa theory is not valid.     

Grafting of 2-HEMA on IPP and in situ chlorinated PP through solution polymerization

Grafting of 2-hydroxyethyl methacrylate (2-HEMA) on isotactic polypropylene (IPP) and in situ chlorinated polypropylene (CPP) by free radical process was carried out at 110°C using toluene as solvent. Various conditions for grafting were optimized. The maximum percent of grafting of 2-HEMA achieved on IPP was 3.6%, whereas that on in situ CPP was 8.7%. The products were characterized by Fourier transform infrared spectroscopy and thermal and contact angle measurements. © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 69: 2107–2113, 1998     

An e.s.r. study of the motion of peroxy radicals in isotactic and atactic polypropylenes

E.s.r. spectra of peroxy radicals trapped in isotactic and atactic polypropylenes have been observed at various temperatures. The spectrum observed at 77 K was shown to be composed of one component by comparing it with that at 4 K. The spectra observed at higher temperatures comprised of two spectra arising from the rigid peroxy radicals and the mobile peroxy radicals. All of the observed spectra have been reconstructed by means of computer simulation and the changes in anisotropic g-values with temperature were estimated. The motion of the mobile fraction was shown to be rotation or rotatory vibration of the radicals around the chain axis both in the isotactic polypropylene and in the atactic polypropylene as well as in polyethylene and poly(tetrafluoroethylene) although the structures of the polymers are different, that is helical (polypropylene) or planar zigzag (polyethylene, poly(tetrafluoroethylene)).     

α/β复合成核剂调控聚丙烯结晶过程的研究进展

综述了3类广泛应用的α/β复合成核剂对聚丙烯结晶动力学、结晶形态及宏观性能等方面影响的研究进展。总结了影响α/β复合成核剂调控聚丙烯结晶的主要因素在于两种成核剂的成核能力,具体表现为其成核聚丙烯结晶温度(TC)的高低:TC高的成核剂在聚丙烯结晶过程中起主导作用,TC低的成核剂基本不起成核作用,当两者的TC相接近时发生竞争成核。根据这一规律,找出了复合α、β两种成核剂的方法,并列举将其运用到调控聚丙烯的结晶过程中的实例。     

Effects of organic nucleating agents and zinc oxide nanoparticles on isotactic polypropylene crystallization

Organic nucleating agents and inorganic nanoparticles, as well as their hybrid composites, affect the crystallization temperature and morphology of the monoclinic α-form of isotactic polypropylene (iPP). Techniques such as differential scanning calorimetry, hot-stage optical microscopy with cross polars, wide angle X-ray diffraction, and transmission electron microscopy were employed. Nanoparticles of zinc oxide function as efficient supports for 1,3,5-benzene tricarboxylic-(N-2-methylcyclohexyl)triamine because the temperature at which the maximum rate of iPP crystallization occurs during 10 °C/min cooling from the molten state increases from 111 °C for the pure polymer to 125 °C at low concentrations of this hybrid nucleating agent. In the absence of zinc oxide, 0.06 wt% of this aliphatic triamine recrystallizes near 165 °C and increases the crystallization temperature of iPP by 7 °C, relative to the pure polymer. Fluorinated aromatic triamines, such as 1,3,5-benzene tricaboxylic-(N-4-fluorophenyl)triamine, are weak nucleating agents that reduce spherulite size in isotactic polypropylene but only increase the crystallization temperature marginally when the polymer is cooled from the molten state. Both micro- and nanoparticles of zinc oxide reduce spherulite size in isotactic polypropylene, but smaller spherulites are observed when the inorganic nanoparticles exhibit dimensions on the order of 40-150 nm relative to micron-size particles. In contrast, 0.06 wt% of the aliphatic triamine in iPP yields a distorted birefringent texture under cross polars that is not spherulitic. Non-spherulitic birefringent textures in iPP are also observed when the aliphatic triamine nucleating agent is coated onto micro- or nanoparticles of zinc oxide. This study demonstrates that the nonisothermal crystallization temperature of isotactic polypropylene increases by an additional 7 °C when an aliphatic triamine is distributed efficiently within the polymeric matrix by coating this nucleating agent onto zinc oxide nanoparticles.     

Crystallization properties of elastomeric polypropylene from alumina-supported tetraalkyl zirconium catalysts

An analysis of the crystallization properties of fractions of elastomeric polypropylene (ELPP) prepared with Al₂O₃-supported tetraalkyl zirconium catalyst is presented. A comparison with the polymorphic behavior of isotactic polypropylene (iPP) samples prepared with a single center homogeneous metallocene catalyst is also shown. The ELPP sample has been fractionated by extraction with boiling solvents. The irregular fraction insoluble in pentane and soluble in hexane crystallizes from the melt almost totally in the γ form, whereas the more stereoregular fraction, insoluble in n-heptane, crystallizes mainly in the α form. The relative amount of γ form crystallized from the melt is much lower than the one formed in samples of metallocene-made iPP samples with a similar average content of isotactic stereosequences. Since the γ form crystallizes in chains having short regular isotactic sequences, these data indicate that in the fractions of the ELPP sample the regular isotactic sequences are longer than those present in chains of metallocene-made iPP. In particular, in the more irregular crystalline fractions of the ELPP sample the chains are characterized by a stereo-block microstructure, consisting in the presence of quite regular isotactic sequences alternating with irregular sequences, the latter containing most of the defects. The presence of stereoblocks allows crystallization of these highly irregular fractions, even in the presence of a very high content of defects, and accounts for the elastomeric properties shown by this sample. The whole ELPP sample is constituted mostly by amorphous ether soluble (40%) and pentane soluble (26%) fractions and shows elastic properties due to the high molecular weight of chains in all the fractions and the crystallization of isotactic sequences present in the stereoblocks.