聚偏二氯乙烯（PVDC）聚合生产工艺防火防爆

简略介绍了聚偏二氯乙烯（ＰＶＤＣ）聚合生产工艺和偏二氯乙烯等主要单体的性质，指出了ＰＶＤＣ聚合生产中工艺方面和其它方面的防火防爆措施。     

偏氯乙烯/丙烯腈/苯乙烯悬浮共聚合动力学

本文研究了偏氯乙烯（ＶＤＣ）／丙烯腈（ＡＮ）／苯乙烯（Ｓｔ）三元悬浮共聚合体系的聚合机理、共聚速率、非聚物组成及其特性粘度的影响因素。实验表明随着投料配比的改变,可分成四个不同聚合机理区域。Ｓｔ对ＶＤＣ／ＡＮ／Ｓｔ三元悬浮共聚有缓聚作用。ＶＤＣ三元悬浮共聚速率可用半经验模型,ｄＣ／ｄｔ＝αＣ＾β「Ⅰ」ｏ＾γｅｘｐ（－γｋｄｔ）描述,由实验得到模型参数γ值为２．２４,模型参数α、β是聚合温度与引发剂浓度的函数。ＶＤＣ－ＡＮ－Ｓｔ三元悬浮共聚物存在着较宽的ＶＤＣ组成分布,并受到单体ＡＮ水溶性的影响,经ＡＮ动态相平衡校正后,可预测ＶＤＣ三元共聚物组成。ＶＤＣ－ＡＮ－Ｓｔ共聚物的特性粘度随着转化率的升高而增大。在相同引发剂用量下,高转化率ＶＤＣ－ＡＮ－Ｓｔ共聚物特性粘度的对数与温度的倒数成线性关系。     

PE,EVA及LDPE／EVA共混物辐照特性的研究

本文在对乙烯－醋酸乙烯共聚物（ＥＶＡ）和聚乙烯（ＰＥ），低密度聚乙烯（ＬＤＰＥ）、线性低密度聚乙烯（ＬＬＤＰＥ）及高密度聚乙烯（ＨＤＰＥ）在＾６０Ｃｏγ射线辐照前后的性能进行比较的基础上，着重研究了ＬＤＰＥ／ＥＶＡ共混物在＾６０Ｃｏγ射线辐照前后的拉伸性能和交联度的变化，以及ＥＶＡ添加量、ＶＡ含量及熔体流动速率（ＭＦＲ）对这些变化的影响。     

E/VAC与马来酸酐反应挤出接枝的研究

用同向双螺杆挤出机进行Ｅ／ＶＡＣ熔融接枝ＭＡＨ的反应。考察了单体、引发剂用量和加工条件对接枝率及熔体流动速率的影响。结果表明,在Ｅ／ＶＡＣ接枝ＭＡＨ的反应中,接枝率随着ＤＣＰ用量、ＭＡＨ用量以及螺杆转速的增加出现峰值,较佳的实验配方为Ｅ／ＶＡＣ：ＭＡＨ：ＤＣＰ＝１００：２：０．２。接枝反应对Ｅ／ＶＡＣ的流动性有很大影响,接枝物的熔体流动速率随ＤＣＰ用量的增加而下降。     

乙酸乙烯酯嵌段共聚物的合成研究

以ＡＩＢＮ为引发剂，用ＣＣｌ４调节乙酸乙烯酯聚合制备了带三氯甲基端基的ＰＶＡｃ大分子引发剂（ＰＶＡｃ－ＣＣｌ３）。以ＣｕＣｌ－ｂｐｙ为催化剂，用ＰＶＡｃ－ＣＣｌ３引发Ｓｔ，ＭＭＡ和ＢＭＡ等单体的ＡＴＲＰ聚合，得到了一系列相对分子质量可控、相对分子质量分布较窄的ＰＶＡｃ嵌段共聚物。     

PVCAD系统的研制和开发

本文介绍了ＰＶＣＡＤ系统的开发研制中的有关技术路线，对ＰＶＣＡＤ系统运行中的若干问题作了较详细的说明，最后提出了ＰＶＣＡＤ系统今后改进的设想。     

2000年我国合成树脂展望

本文以最新的情报信息资料，全面地，系统地综述了我国１９９０－２０００年合成树脂ＬＤＰＥ，ＬＬＤＰＥ，ＨＤＰＥ，ＥＶＡ，ＣＰＥ，ＰＰ，ＰＶＣ（含ＰＶＤＣ），ＰＳ（ＧＰＰＳ，ＨＩＰＳ，ＥＰＳ），ＡＢＳ，ＡＣＳ，ＭＢＳ，ＳＢＳ等发展情况，新建装置，生产能力；近年来开发成功的新产品，特性及应用；并对合成树脂发展予以展望。     

PVDC聚合生产工艺防火防爆

简略介绍了ＰＶＤＣ聚合生产工艺，介绍了偏氯乙烯等主要单体的性质，指出了ＰＶＤＣ聚合生产中工艺方面和其它方面的防火防爆安全技术。     

反应挤了HDPE／PET共混合金结构与性能研究

采用ＤＳＣ、ＷＡＸＤ、ＳＥＭ及ＴＧＡ等方法研究了ＨＤＰＥ／ＰＥＴ共混合金在增溶剂Ｅ／ＶＡＣ或Ｅ／ＡＡ作用下的结晶性、形态结构及热稳定性。结果表明，Ｅ／ＶＡＣ或Ｅ／ＡＡ的加入，使ＨＤＰＥ／ＰＥＴ体系中ＨＤＰＥ组分的熔融热焓降低，结晶度下降，但熔融峰位置和晶胞基本保持不变；从ＳＥＭ照片可以观察到Ｅ／ＶＡＣ、Ｅ／ＡＡ对共混体系具有一定的增容作用，Ｅ／ＡＡ和效果优于Ｅ／ＶＡＣ；共混体系的热稳定性随Ｅ／ＶＡ     

稀土对聚氯乙烯（PVC）的热稳定作用

稀土对聚氯乙烯（ＰＶＣ）的热稳定作用李昕ＴＨＥＲＭＡＬＳＴＡＢＩＬＩＺＡＴＩＯＮＯＦＲＡＲＥＥＡＲＴＨＳＯＮＰＶＣ１前言聚氯乙烯（ＰＶＣ）是世界五大通用塑料之一，１９８７年，ＦＶＣ树脂产量约６００ｋｔ，制成品约８００ｋｔ，１９９０年ＰＶＣ树脂产量将近...     

链式交联聚合的凝胶/溶胶分配理论模型

针对间歇法链式交联聚合体系中交联的不均匀性,推导出适于该体系的凝胶含量模型,并应用于氯乙烯-邻苯二甲酸二烯丙基酯悬浮共聚体系,由实验数据回归求得模型参数K。结果表明,模型可很好地描述聚合条件与聚合产物凝胶分率的关系。     

Crosslinked PVC polymerization: Study on process dependencies

A systematic study of how different processes and crosslinking agents affect the crosslinked polymerization of poly(vinyl chloride) (PVC) to be used for plastisol application was carried out. Two processes, microsuspension (MS) and seeded polymerization (SP), and two crosslinking agents, diallyl phthalate (DAP) and 1,3‐butanediol dimethacrylate (BDMA), were considered. Variations in degree of polymerization and gel content as functions of conversion, as well as the amount of crosslinking agent, was experimentally investigated for both processes and the results were precisely analyzed. We found that the microsuspension process is much better for crosslinked polymerization of PVC to be used for plastisol application; the seeded polymerization process was restricted by the transfer of crosslinking agents to the polymerization sites. Diallyl phthalate was proven to be a good crosslinking agent as generally known until now. Consequently, to perform crosslinked PVC polymerization in industry, the type of process should be taken into account and proper materials and steps should be set up. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 83: 1947–1954, 2002     

自由基交联聚合基链在溶胶/凝胶中的分配及溶胶分分子量

从作者提出的统计/动力学建模思想出发,建立了基链在溶胶/凝胶间分配模型,进而建立了溶胶分子平均聚合度模型．仿真计算表明：凝胶分中基链链长明显大于溶胶分;凝胶点过后,溶胶分子量急剧下降,随后根据竞聚率的不同,有不同的变化趋势．模型应用于氯乙烯／邻苯二甲酸二烯丙基酯悬浮交联聚合体系,可较好地预测溶胶分子量随聚合过程的变化．     

Structure–property relationships of lightly chemical crosslinked poly(vinyl chloride) thermoplastic elastomer

Chemical crosslinked poly(vinyl chloride) (C‐PVC) was synthesized by vinyl chloride suspension polymerization in the presence of diallyl phthalate (DAP) and plasticized to prepare poly(vinyl chloride) (PVC) thermoplastic elastomer (TPE) materials. The chemical crosslinking and physical crosslinking structure in chemical crosslinked PVC‐TPE were investigated. It showed that the gel fraction and the crosslinking density of gel increased as the feed concentration of DAP increased. C‐PVC prepared by VC/DAP copolymerization was lightly crosslinked as compared with irradiation crosslinked PVC. Physical entanglements would greatly influence the crosslinking density of gel when the gel fraction was high. Chemical crosslinking had little influence on the recrystallization behavior of PVC. A structure model of chemical crosslinked PVC‐TPE was proposed, in which chemical networks acted with physical networks cooperatively. It also showed that chemical crosslinking and physical crosslinking influenced the processability and mechanical properties of chemical crosslinked PVC‐TPE cooperatively. Although the processability of PVC‐TPE deteriorated with chemical crosslinking, the dimension stability and elasticity of PVC‐TPE were improved as the permanent chemical networks were introduced. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 868–874, 2000     

扩链剂在氯乙烯聚合中的应用

扩链剂以异氰脲酸三烯丙酯（TAIC）和马来酸双烯丙酯（DAM）及邻苯二甲酸二烯丙酯（DAP）为主要代表,其应用技术要点所涉及的内容有用途、用法、用量、使用成本等。针对这些技术要点问题,以悬浮法和乳液法生产聚氯乙烯树脂为范例作了分析。并对扩链剂在氯乙烯聚合中的应用发展提出了建议。     

Influences of diallyl phthalate as chain extender on the properties of high molecular weight poly(vinyl chloride) resin

A higher porosity with better thermostability is desirable for poly(vinyl chloride) (PVC) resin. In this study, high molecular weight PVC resins are prepared by vinyl chloride monomer (VCM)‐diallyl phthalate (DAP) suspension copolymerization in a 20‐L reactor at 50 °C using DAP as chain extender. SEM, BET, and analyses of plasticizer absorption results show the high molecular weight poly(vinyl chloride) (HPVC) by DAP‐VCM copolymerization is loose and porous. With increasing DAP content when the mass ratio of DAP/VCM (ω) is below the gel point, the porosity and the degree of polymerization increase. Nevertheless, the bulk density and particle size decrease. When more than the gel point, these relationships are reversed. Thermogravimetric analysis revealed that the HPVC had better thermostability than that of commercial PVC, and its thermostability increases with increasing ω before it reaches the gel point. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 45093.     

Processability and characterization of poly(vinyl chloride)‐b‐poly(n‐butyl acrylate)‐b‐poly(vinyl chloride) prepared by living radical polymerization of vinyl chloride. Comparison with a flexible commercial resin formulation prepared with PVC and dioctyl phthalate

This work reports the synthesis and processing of a new flexible material based on PVC produced by living radical polymerization. The synthesis was carried out in a two‐step process. In the first step the macroinitiator α, ω‐di(iodo)poly(butyl acrylate) [α, ω‐di(iodo)PBA] was synthesized in water by single electron transfer/degenerative chain transfer mediated living radical polymerization (SET‐DTLRP) catalyzed by Na₂S₂O₄. In the second step this macroinitiator was reinitiated by SET‐DTLRP of vinyl chloride (VC), thereby leading to the formation of the block copolymer poly(vinyl chloride)‐b‐poly(butyl acrylate)‐b‐poly(vinyl chloride) [PVC‐b‐PBA‐b‐PVC]. This new material was processed on a laboratory scale. The DMTA traces showed only a single glass transition temperature, thus indicating that no phase segregation was present. The copolymers were studied with regard to their processing, miscibility, and mechanical properties. The first comparison with commercial formulations made with PVC and dioctyl phthalate (DOP) is presented. J. VINYL ADDIT. TECHNOL., 12:156–165, 2006. © 2006 Society of Plastics Engineers     

Zinkacrylat und andere feste Monomere als Vernetzungsmittel für ungesättigte Polyester

The peroxide-initiated copolymerisation of an unsaturated polyester with zinc acrylate, diallyl phthalate prepolymer and a solid vinyl ester resin was investigated. The curing was followed by means of gelation curves and differential scanning calorimetry. The studies showed that zinc acrylate has the highest reactivity.     

氯乙烯－二烯类单体悬浮共聚物凝胶点前的分子量模型

从氯乙烯（ＶＣ）两相聚合的特点出发，根据拟动力学常数法和分子量分布矩理论，建立了ＶＣ－微量二烯类单体悬浮共聚物凝胶点前的分子量模型，求得悬挂双键表现活性。结果表明：模型可很好地描述反应过程中分子量变化，悬挂双键表现活性下降一个数量级，物理效应对交联反应有较大的影响。     

交联共聚中拟初级分子内交联速率常数的测定

<正>悬挂双键行为是自由基交联共聚反应的关键,除参与分子间交联反应外,还可参与环化、初级分子内交联、次级分子内交联等反应。环化反应定义为二(多)烯自由基“回咬”同一单体链节中的悬挂双键的反应,初级分子内交联反应指自由基“回咬”同一基链上的悬挂双键的反应,次级分子内交联反应指自由基“回咬”同一分子中其它基链上的悬挂双键的反应。 由于二烯用量极少。通常很难定量测定悬挂双键浓度。很少有定量研究悬挂双键行为的实验报道,Lantin用超导核磁共振仪直接测定了甲基丙烯酸甲酯-乙二醇二甲基丙烯酸酯体