ABS接枝胶粉氯化法制备新型ACS材料

用气固相法制备氯化ABS接枝胶粉，再与SAN[苯乙烯(S)-丙烯腈(AN)的无规共聚物]共混，制得工程塑料新型ACS(苯乙烯-氯化ABS接枝胶粉-丙烯腈)。研究了氯化反应条件、氯化ABS接枝胶粉质量分数、氯含量、聚丁二烯质量分数对ACS力学性能的影响；通过DSC技术分析了材料的热性能。结果表明：在冰水浴中、控制氯气流量的条件下，氯化接枝胶粉质量分数为39％～52％、氯含量为10％～15％、胶粉型号为PP180时，新型ACS的拉伸、冲击性能明显优于ABS树脂，其热性能也与传统的ACS树脂相当。     

ACS树脂的制备,性能和应用

1 概述ACS树脂是将丙烯腈(AN)和苯乙烯(St)接枝到氯化聚乙烯(CPE)弹性体的主链上,形成三元接枝共聚物的一种新型高分子材料。众所周知,具有卓越综合性能的ABS树脂(丙烯腈一丁二烯—苯乙烯三元共聚物)其韧性、刚性、加工性和耐化学药品等性能优异,是一种用途广泛的工程塑料。但ABS树脂中的橡胶成份丁二烯含有     

阻燃ACS树脂的制备及应用

采用熔融挤出法制备阻燃ACS树脂,研究了环保溴系阻燃剂、增韧剂种类及用量对阻燃ACS综合性能的影响.结果表明,低分子量溴化环氧树脂/三氧化二锑复配阻燃ACS树脂的综合性能损失较小,耐候性良好.ABS高胶粉的增韧效果优于氯化聚乙烯(PE-C),但所得增韧阻燃ACS的拉伸性能、弯曲性能降幅较大.PE-C具有协效 阻燃作用,...     

新型ACS树脂的研制

从乙烯—丙烯共聚物弹性体(EP)出发,通过氯化反应生成氯化乙丙共聚物弹性体(CEP),然后与丙烯腈(A)、苯乙烯(S)进行接枝共聚,合成新型ACS树脂。研究了EP组成,CEP的氯含量,A、C、S 3种组份比例等条件对ACS树脂性能的影响。     

新型三聚物——ACS树脂

据《日本塑料》杂志报导,日本于1969年年初制成一种新型三聚物,名叫ACS树脂。它是以丙烯睛(AN)和苯乙烯在氯化聚乙烯分子上进行接枝共聚而成。这种用氯化聚乙烯(CPE)代替丁二烯(即ABS树脂中的B)制成的新型工程塑料——ACS三聚物,完全敌得上ABS树脂。这种树脂冲击强度高,具有良好的耐候性和耐热性。     

氯化接枝法制备高性能氯化聚乙烯

报道了在氯化聚合物大分子链上进行接枝及引进各种官能团的方法——氯化接枝法。该方法可以有效地制备特殊性能或含有官能团的含氯聚合物，并可进行分子结构和材料结构的设计。     

NBR/PCMO共混体系中的接枝反应

利用傅立叶转换红外光谱仪和相差显微镜等仪器对NBR／氯化聚醚(PCMO)共混物的化学结构和微观形态进行分析。研究表明，NBR／PCMO共混物在高温混炼过程中发生了接枝反应，接枝产物起到了相容剂的作用，增大了两相的相容性，从而提高了共混物的物理性能、耐热空气老化性能及耐臭氧老化性能。     

ACS用量对CPVC-ACS复合材料的性能影响

采用机械共混法制备了氯化聚氯乙烯(CPVC)、丙烯腈-氯化聚乙烯-苯乙烯(ACS)二元共混复合材料(CPVC-ACS),研究了共混复合材料的组成与材料力学性能、耐热性能、阻燃性能和抗老化性能的关系。结果表明,ACS加入到CPVC中,可达到良好的增韧效果,但ACS用量的增加使CPVC的拉伸强度和维卡软化点温度降低;ACS对CPVC的阻燃性能影响不大,改性CPVC均可达到难燃级;用ACS改性CPVC的抗老化性能明显优于CPVC-ABS。     

阻燃ABS的流动性及CPE对其增韧的研究

研究了四溴双酚A(TBBPA)、十溴联苯醚(DBDPO)对阻燃ABS流动性的影响及氯化聚乙烯(CPE)对阻燃ABS的增韧作用，制备出熔融指数(MFR)不同的一系列阻燃ABS，为适应不同加工条件、研制性能不同的阻燃ABS提供了参考。     

无卤阻燃ACS/PC合金的制备及性能

以聚碳酸酯(PC)为耐热树脂,磷酸酯为阻燃剂制备无卤阻燃丙烯腈-氯化聚乙烯-苯乙烯塑料(ACS)/PC合金,研究了ACS与PC的质量比、磷酸酯用量、增容剂用量等因素对阻燃ACS/PC合金综合性能的影响。结果表明,当ACS与PC的质量比为75∶25时综合性能最优;增容剂马来酸酐接枝(丙烯腈/苯乙烯)共聚物(AS-g-MAH)可以有效提高缺口冲击强度;磷酸酯与ACS存在协同增效作用,相对于阻燃丙烯腈-丁二烯-苯乙烯塑料/PC合金,阻燃ACS/PC合金的磷酸酯用量大幅下降。     

高温本体聚合合成ACS树脂的接枝率研究

研究了聚合条件、配方组成及氯化聚乙烯(CPE)的氯化度对高温本体聚合合成丙烯腈(AN) CPE苯乙烯(St)接枝共聚物（ACS）树脂接枝率的影响。结果表明,本体聚合合成ACS树脂过程中接枝反应主要发生在聚合转化率低于50 %的低转化率阶段;反应温度、引发剂及链转移剂用量是影响本体聚合合成ACS接枝率的主要因素;提高聚合反应温度、增加引发剂和链转移剂浓度均会导致接枝率显著下降;St/AN的质量比、CPE橡胶的含量及氯化度对接枝率的影响较小。     

The adhesive properties of chlorinated ultra-high molecular weight polyethylene

Ultra-high molecular weight polyethylene (UHMW-PE) is well known for its abrasion and chemical resistance. Recently we developed a new application for UHMW-PE as a liner in elastomeric hoses. It was found that the adhesion between UHMW-PE and elastomers such as ethylene-propylene-diene monomer (EPDM) and styrene-butadiene rubber (SBR) is sufficient for practical applications, but the adhesion to nitrile rubber (NBR) is poor. In order to improve the adhesion between NBR and the UHMW-PE liner, (nascent) powder chlorinated polyethylenes were used as interlayers between UHMW-PE and NBR. These powder chlorinated polyethylenes are polymers with a dual nature and are composed of highly chlorinated polyethylene segments compatible with NBR and polyethylene segments compatible with UHMW-PE. In order to achieve sufficient adhesion, the chlorine content of the chlorinated blocks should be at least 15 wt%. If these powder chlorinated UHMW-PEs have a chlorine content of 15 wt% in the chlorinated blocks, dilution with polyethylene hardly affects the adhesive properties, which is an advantage in the practical use of these materials as interlayers.     

PB-g-SAN接枝粉料的含胶量对ABS性能的影响

通过种子乳液聚合合成了一系列含胶量不同的聚丁二烯接枝(苯乙烯／丙烯腈)共聚物(PB-g-SAN)接枝粉料。考察了PB—g-SAN接枝粉料的含肢量对其接枝率的影响。将PB-g-SAN接枝粉料与SAN共混制备ABS，控制二者比例使每批ABS含胶量相同，均为15％。研究了PB—g—SAN接枝粉料的含胶量对ABS性能的影响。发现PB—g-SAN接枝粉料的含胶量在60％时，ABS的力学性能最好。     

Liquid chlorine as chlorinating agent for preparation of chlorinated natural and synthetic rubbers

In order to overcome the use of solvents like carbon tetrachloride (during the industrial preparation of chlorinated natural rubber or chlorowaxes) which are suspected of damaging the layer of atmospheric ozone, I proposed the use of liquid Cl₂ as both chlorinating agent and solvent. It is shown that natural rubber or synthetic cis-1,4-polyisoprene can be swelled by liquid chlorine at ?40°C. By equilibrating to room temperature, the rubber is chlorinated by the expansion of the chlorine trapped in the rubber granules in a process resembling popcorn formation. Chlorine uptake was found to be 56.5% and the chlorinated rubber obtained was studied by FT-IR spectroscopy. Cis-1,4-polybutadiene, when chlorinated with liquid chlorine, gives a hard insoluble product with chlorine content of 36%. © 1995 John Wiley & Sons, Inc.     

橡胶含量对ABS成品性能的影响

以橡胶含量为40％和60％的丙烯腈—丁二烯——苯乙烯共聚物(ABS)粉料分别与苯乙烯，丙烯腈共聚物掺混造粒，制备一系列不同橡胶含量的ABS成品，分析了不同橡胶含量ABS成品性能，比较了高橡胶含量和低橡胶含量的ABS粉料对成品性能的影响。研究结果发现，在橡胶含量相同的情况下，使用高橡胶含量的ABS粉料，成品的力学性能较为优异。     

Development of a methodology for characterizing commercial chlorinated latex gloves

Chlorination of gloves has gained popularity as a more permanent method of reducing the inherent tackiness of natural rubber latex compared to using powder as a dusting lubricant. Transmission of proteins in natural rubber latex into the air as a result of using powder on natural rubber latex gloves may cause serious complications to allergic individuals. A methodology for characterizing commercial chlorinated natural rubber latex gloves using a combination of attenuated total reflectance (ATR)–Fourier transform infrared (FTIR) spectroscopy and ion chromatography (IC) is described. ATR–FTIR studies established that 930–915 and 670–650 cm⁻¹ are definitive wavenumber ranges for the identification of chlorine in commercial chlorinated latex gloves. Confirmation of the ATR–FTIR results and semiquantification of the chlorine content in the latex gloves was carried out by the IC technique. This methodology can be used by glove manufacturers to determine the amount of chlorine in batches of commercial gloves, and thereby prevent possible threats to public health arising from the deterioration of surgical and examination chlorinated latex gloves under severe storage conditions before the end of their expected shelf life. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 672–682, 2001     

废旧丁腈橡胶粉改性ABS的性能研究

采用熔融共混挤出的方法,制备了废旧丁腈橡胶粉不同掺量的丙烯腈-丁二烯-苯乙烯共聚物（ABS）复合材料,研究了废旧丁腈橡胶粉对复合材料力学性能、流动性能和热稳定性的影响。结果表明：废旧丁腈橡胶粉降低了ABS的拉伸强度和弯曲强度,提高了冲击强度,其适宜的掺量宜控制在5%以内;而且,WNBR的加入使复合材料的热稳定性得到提高,但降低了复合材料的流动性。     

氯化原位接枝反应制备羟基官能化CPE力学性能研究

采用气-固相氯化原位接枝来实现对聚乙烯粉末的改性，将氯化和接枝过程合为一体，大大简化了接枝共聚物的合成过程，为含氯聚合物的改性提供了一个新的手段。以高密度聚乙烯（HDPE）为原料．采用氯化原位接枝法合成了以氯化聚乙烯（CPE）为骨架聚合物，丙烯酸-2-羟基乙酯（HEA）为支链的接枝聚合物，反应中不需要加入任何引发剂。探讨了影响接枝聚合物力学性能的因素及变化规律。实验结果表明接枝聚合物的力学性能较CPE有显著的提高。氯化接枝温度、聚合物氯含量以及HEA单体的加入量对CPE—g—HEA的力学性能有很大的影响。     

Influence of rubber content in ABS in wide range on the mechanical properties and morphology of PC/ABS blends with different composition

A series of acrylonitrile–butadiene–styrene (ABS) with different rubber content were prepared by diluting ABS grafting copolymer containing 60% rubber with a styrene–acrylonitrile copolymer. ABS prepared were blended with bisphenol‐A‐polycarbonate (PC) at the ratio of 70/30, 50/50, and 30/70 to prepare PC/ABS blends. Influence of rubber content in ABS on the properties of ABS and PC/ABS blends were investigated. PC/ABS blends with different compositions got good toughness when the rubber in ABS increased to the level that ABS itself got good toughness. The tensile properties and processability of PC/ABS blends decreased with the increase of the total rubber content introduced into the blends. ABS with the rubber content of 30 wt% is most suitable to be used to prepare PC/ABS blends. The rubber content in ABS affected the viscosity of ABS, and subsequently the viscosity ratio of PC to ABS. As a result, the morphology of PC/ABS blends varied. The increase of rubber content in ABS results in finer structure of PC/ABS blends. POLYM. ENG. SCI. 46:1476–1484, 2006. © 2006 Society of Plastics Engineers.