氯乙烯-醋酸乙烯悬浮共聚树脂的开发与研究

采用悬浮聚合工艺制备出氯乙烯-醋酸乙烯(VC-VAC)共聚树脂,考察了聚合配方、聚合温度、搅拌速度及分散剂种类及用量对VC-VAC共聚树脂性能的影响。     

乙烯-醋酸乙烯共聚树脂的生产技术及应用

综述了乙烯-醋酸乙烯共聚树脂(EVA)的生产工艺、技术改进及国内外的发展状况。根据国内外EVA产业技术现状,提出EVA树脂未来生产发展的建议。     

乙烯-醋酸乙烯共聚树脂在预涂膜领域的应用研究进展

介绍了国内外乙烯-醋酸乙烯共聚树脂(EVA)在预涂膜领域的应用情况,以及国内外EVA树脂和预涂膜产品的发展概况。     

乙烯-醋酸乙烯基钢质管道防腐用热熔胶的研究

以EVA树脂为主体树脂制备钢质管道防腐用热熔胶,选用聚合松香为增粘剂,聚异丁烯为增韧剂,研究了不同VA含量、不同熔体指数的EVA树脂、聚合松香及聚异丁烯对热熔胶环球软化点、脆化温度和剥离强度等性能的影响。     

偏二氯乙烯-氯乙烯共聚树脂的阻隔性

介绍了聚偏二氯乙烯-氯乙烯（VDC—VC）共聚树脂的阻隔特性及原理,分析了聚合过程、添加剂配方、成型加工工艺等对PVDC阻隔性能的影响。认为采用综合改进措施可以获得阻隔性能优异的PVDC制品。PVDC共聚树脂的未来发展将以多层共挤树脂为方向。     

双环戊二烯-苯乙烯共聚加氢石油树脂的研究

制备了双环戊二烯-苯乙烯共聚加氢石油树脂,考察了苯乙烯含量、聚合温度、聚合时间等条件对共聚树脂性质的影响,并探究了聚合机理。研究结果表明:通过选择合适的催化剂,实现了双环戊二烯-苯乙烯共聚树脂的选择性加氢,得到软化点为98℃、加德纳色号接近0号、蜡雾点为87℃、浊点为36℃的双环戊二烯-苯乙烯共聚加氢石油树脂。     

氯乙烯-丙烯酸丁酯悬浮共聚树脂的研制

介绍了采用悬浮法研制氯乙烯-丙烯酸丁酯悬浮共聚树脂。考察了共聚配方、丙烯酸丁酯的加入方式及用量、分散剂种类及用量、聚合温度对共聚树脂的影响。     

采用70m~3聚合釜工业化试生产氯乙烯-丙烯酸正丁酯共聚树脂

在70 m~3聚合釜中,采用悬浮聚合工艺,通过优化聚合配方,生产出了丙烯酸正丁酯质量分数分别为3%和5%共聚树脂,并分析了产品质量和力学性能。结果表明:1共聚树脂颗粒粒度分布集中;2共聚树脂具有较高的表观密度和更低的增塑剂吸收量;3共聚树脂具有更好的冲击性能和内增塑作用,说明丙烯酸正丁酯与氯乙烯共聚效果良好;4丙烯酸正丁酯质量分数为5%的共聚树脂较质量分数为3%的共聚树脂综合性能更优。     

偏氯乙烯-丙烯酸甲酯悬浮共聚树脂的研制

采用悬浮共聚的方法研制了偏氯乙烯/丙烯酸甲酯（VDC/MA）共聚树脂。考察了共聚配方、分散剂种类及用量、搅拌速度及聚合温度对VDC/MA共聚树脂的影响。结果表明,当VDC/MA=（92-96）/（8-4）、采用分散剂B（用量0.13%)、搅拌速度300-400r/min,并根据聚合温度调节分子量大小,制得的VDC/MA共聚树脂其膜光泽好、透时度高,热稳定性好。     

偏氯乙烯-丙烯酸甲酯悬浮共聚树脂组成及聚合温度与性能的关系

通过DSC测试及HAAKE流变测试,对偏氯乙烯-丙烯酸甲酯悬浮共聚树脂的组成及聚合温度对其加工性能、熔融温度、结晶度等性能的影响进行了研究,进而对树脂的结晶结构进行了探讨、为工业控制树脂的合成条件提供依据。     

Preparation and characterization of ethylene vinyl acetate copolymer/montmorillonite nanocomposite

Ethylene vinyl acetate copolymer (EVA) and monmorillonite (MMT) nanocomposites have been investigated as a function of vinyl acetate content and molecular weight of EVA and types of substituted alkyl ammonium of MMT. It is found that vinyl acetate content and type of substituted alkyl ammonium are important factors for the intercalation behaviour of MMT in MMT/EVA nanocomposite. Maleic anhydride grafted high‐density polyethylene was used as a compatibilizer to improve the intercalation behaviour of MMT. X‐ray diffraction and transmission electron microscopy were used to characterize the intercalation/exfoliation behaviour, and mechanical properties were measured. © 2003 Society of Chemical Industry     

氯乙烯/丙烯酸酯二元及多元共聚物的研究进展

介绍了氯乙烯/丙烯酸酯多元共聚物、聚氯乙烯树脂/丙烯酸酯/顺丁烯二酰亚胺接枝共聚物、聚氯乙烯树脂/N-取代马来酸胺/丙烯酸酯接枝共聚树脂、氯乙烯/乙酸乙烯/丙烯酸羟丙酯共聚物、氯乙烯/乙酸乙烯/丙烯酸丁酯共聚乳液、聚丙烯酸酯-氯乙烯接枝共聚物、氯乙烯/乙烯/丙烯酸羟乙酯共聚涂料树脂、氯乙烯/丙烯酸甲酯共聚乳液的特点、生产工艺及其性能和用途.     

氯乙烯-醋酸乙烯酯共聚糊树脂的开发

介绍了国内外氯乙烯一醋酸乙烯酯共聚糊树脂的基本理论、生产状况、产品特性及工艺技术，并详细介绍了沈阳化工股份有限公司的氯醋糊树脂开发的进程、工艺及产品的质量指标。     

酯溶性氯乙烯-醋酸乙烯酯共聚树脂的研发生产

对比进口与国产氯乙烯-醋酸乙烯酯共聚树脂的常规性能和应用性能,查找了国产氯醋树脂质量差距;针对氯乙烯和醋酸乙烯酯悬浮聚合过程提出了优化措施,改善了氯醋树脂的颗粒形态和分子组成的均匀度,进而提升了酯溶性等应用性能.     

连续加料工艺对氯乙烯-醋酸乙烯酯共聚树脂性能的影响

对比了采用氯乙烯连续加料和一次性加料工艺生产的氯乙烯-醋酸乙烯酯共聚树脂(简称氯醋树脂)的质量和加工性能,结果表明:采用连续加料工艺生产的氯醋树脂的化学组成均匀,溶解性能和加工性能得到提高。     

Plastification of poly(vinyl chloride) by polymer blending

Blends of poly(vinyl chloride) (PVC) with different copolymers have been studied to obtain a plasticized PVC with improved properties and the absence of plasticizer migration. The copolymers used as plasticizers in the blends were acrylonitrile butadiene rubber, ethylene vinyl acetate (EVA), and ethylene-acrylic copolymer (E-Acry). Blends were studied with regard to their processing, miscibility, and mechanical properties, as a function of blend and copolymer composition. The results obtained were compared with those of equivalent compositions in the PVC/dioctyl phthalate (DOP) system. Better results than PVC/DOP were obtained for PVC/acrylonitrile butadiene rubber blends. The plasticizing effect on PVC of EVA and E-Acry copolymers was similar to that of DOP. It is shown that crosslinking PVC/E-Acry blends or increasing the vinyl acetate content in PVC/EVA blends, are alternatives that can increase the compatibility and mechanical properties of these blends. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 75: 1303–1312, 2000     

氯乙烯-乙烯基异丁基醚共聚树脂黏度的影响因素

讨论了乙烯基异丁基醚含量、转化率、氯乙烯单体初始加入量、聚合温度对氯乙烯-乙烯基异丁基醚共聚树脂黏度的影响规律.     

Study on the morphology and properties of metallocene polyethylene and ethylene/vinyl acetate blends

Two commercial polymer materials, metallocene linear low density polyethylene (m‐LLDPE) and ethylene/vinyl acetate copolymer (EVA) have been used to form binary blends of various compositions. The mechanical properties, morphology, rheological behavior, dynamic mechanical properties, and crystallization of m‐LLDPE/EVA blends were investigated. It was found that with the addition of EVA, the fluidity and processability of m‐LLDPE were significantly improved, and the introduction of polar groups in this system showed no significant changes in mechanical properties at lower EVA content. As verified by morphology observation and differential scanning calorimetry analysis, miscible blends were formed within certain weight ratios. Dynamic mechanical property studies showed that flexibility of the blends was enhanced in comparion with pure m‐LLDPE, where the peak value of loss modulus shifted to lower temperature and its intensity was enhanced as EVA content increased, indicating the existence of more amorphous regions in the blends. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 91: 905–910, 2004     

Radiation effects on HDPE/EVA blends

In this article, we discuss the radiation effects of high‐density polyethylene (HDPE)/ethylene–vinyl acetate (EVA) copolymer blends. In comparison with the low‐density polyethylene/EVA blends, the EVA content in the HDPE/EVA blends had a lower enhancement effect on radiation crosslinking by γ‐ray irradiation in air. The phenomenon is discussed with the compatibility, morphology, and thermal properties of HDPE/EVA blends. The HDPE/EVA blends were partly compatible in the amorphous region, and radiation crosslinking of the HDPE/EVA blend was less significant, although increasing the amorphous region's content of the HDPE/EVA blends and the vinyl acetate content of EVA were beneficial to radiation crosslinking. The good compatibility was a prerequisite for the enhancement effect of EVA on the radiation crosslinking of the polyethylene/EVA copolymer. The radiation crosslinking and the degradation mechanism of HDPE/EVA blends were examined quantitatively by a novel method, the step analysis process of irradiated HDPE/EVA blends with a thermal gravimetric analysis technique. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 86: 553–558, 2002     

乙烯-乙酸乙烯酯共聚物中乙酸乙烯酯的红外光谱法测定

利用ATR技术测量样品的红外光谱,采用偏最小二乘法对所测光谱进行分析,建立了一种快速分析方法;对乙烯-乙酸乙烯酯共聚物中乙酸乙烯酯进行测定。结果表明：标准曲线线性关系良好,相关系数为0．99985,方法简单快速,结果可靠。