EPDM-g-MAN增韧聚氯乙烯的研究

用悬浮法合成三元乙丙橡胶（EPDM）与甲基丙烯酸甲酯（MMA）及丙烯腈（AN）接枝共聚物（EPDM-g-MAN）,用其增韧聚氯乙烯（PVC）树脂。研究了PVC/EPDM-g-MAN共混物的抗冲击性能、增韧机理、相结构以及热稳定性,并与PVC/氯化聚乙烯(CPE)共混物的抗冲击性能进行了对比。结果表明：EPDM-g-MAN比CPE具有更好的增韧效率。SEM分析表明,随着EPDM-g-MAN用量的增加,共混物的增韧机理由裂纹支化终止转变为剪切屈服兼有空穴化。TEM分析表明,EPDM以分散相均匀分散于PVC连续相中,两相界面模糊,具有良好的相容性,且随着EPDM含量的增加,共混物的相结构由“海-岛”结构转变为近连续相结构。EPDM-g-MAN的加入提高了PVC的热稳定性。     

不同熔融焓氯化聚乙烯对PVC改性的影响

采用不同熔融焓增韧改性剂CPE对PVC进行了改性,研究了 CPE对PVC/CPE共混料的影响.结果表明:不同熔融焓的增韧改性剂CPE对PVC/CPE共混料的流变性能、缺口冲击强度、拉伸冲击强度和焊接强度都有较大的影响;含氯质量分数为36％左右、熔融焓(DSC法)≤1.4 J/g的CPE比较适合作为PVC材料的冲击改性剂...     

纳米CaCO3/CPE/EPDM复合材料制备及性能研究

研究了纳米CaCO3增韧CPE/EPDM复合材料的制备方法,探讨了纳米CaCO3、CPE的用量对EPDM对复合材料力学性能、电性能以及热氧老化性能的影响。结果表明:向EPDM添加经不饱和酸处理的纳米CaCO3和CPE后,纳米CaCO3/CPE/EPDM的共混比为10/25/65,DCP用量为3 phr,TAIC用量为1 phr时,可以制得综合性能较好的纳米CaCO3/CPE/EPDM复合材料,拉伸强度、撕裂强度、断裂伸长率、体积电阻率比纯EPDM分别提高了60%、20%、20%、15%,而材料的热氧老化性能变化趋势与纯EPDM差异不大。     

CPE-g-VC共聚树脂结构与性能的关系

采用悬浮溶胀接枝共聚方法合成不同CPE含量的CPE - g -VC共聚树脂 ,对其加工性能和力学性能进行了研究 ,并与PVC、PVC/CPE共混物进行比较。结果表明 :接枝共聚物的加工性能优于PVC和PVC/CPE共混物 ,且其加工性能随CPE含量增加而逐渐改善 ;在CPE含量相同时 ,CPE - g -VC共聚物的冲击强度大于PVC/CPE共混物 ,冲击强度随CPE含量的增加而增强 ;当CPE含量相同时 ,CPE -g -VC共聚物的冲击强度随接枝率增加而增强 ;相近CPE含量的接枝共聚物的屈服强度大于共混物。     

EPDM/三元共聚尼龙高性能弹性体相容剂及共混工艺的研究

研究了相容剂及其用量和加工工艺对EPDM/三元共聚尼龙(PA)共混体系物理性能的影响.结果表明,氯化聚乙烯(CPE)是EPDM/PA共混体系性能优良且价廉易得的相容剂;CPE的最佳用量为PA的1/2.SEM照片显示,EPDM与PA相容性差;二元体系EPDM/PA加入CPE后,分散相PA/CPE分散均匀,粒径细小.共混温度控制在(160±5)℃为宜,PA与CPE共混时间控制在15min为宜,EPDM与CPE/PA的混炼时间控制在8min为宜.还考察了加料顺序对共混物性能的影响.     

不同原料制备的CPE性能及对PVC/CPE体系的影响

采用不同原料制备了性能各异的增韧改性剂CPE,研究了它们对复合材料性能的影响。结果表明,不同牌号的HDPE对制得的CPE的性能、PVC/CaCO3/CPE混料的塑化时间以及PVC/CaCO3/CPE复合材料的冲击强度都具有明显的影响。     

CPE/EPDM并用胶料基本性能的研究

本文研究了CPE/EPDM并用胶料的基本性能和制造方法,着重讨论了CPF/EPDM共混比、填充剂、阻燃剂对共混物物理机械性能和阻燃性能的影响。通过实验得出结论:CPE/EPDM共混料的拉伸强度、300％定伸应力、阻燃性能均优于EPDM纯胶配合。     

改善三元乙丙橡胶耐油性能的研究

研究氯化聚乙烯(CPE)、丁腈橡胶(NBR)与三元乙丙橡胶(EPDM)并用对共混胶力学性能和耐油性能的影响。结果表明,在EPDM/CPE共混胶中随CPE用量的增加,硫化胶的硬度、拉伸强度、撕裂强度和定伸应力呈现上升趋势、在ASTM3号油中浸泡后体积变化率变化不明显;在EPDM/NBR共混胶中随NBR用量的增加,硫化胶的拉伸强度、撕裂强度和定伸应力呈现下降趋势、在油中体积变化率明显减小;在EPDM/NBR/CPE共混胶中随NBR和CPE用量的增加,硫化胶的力学性能变化不明显,但在油中浸泡体积变化率明显降低,通过电镜照片对共混胶断面分析得知CPE的加入明显改善了EPDM和NBR之间的相容性。     

CPE—g—VC接枝共聚树脂性能与加工应用研究

本文测试了CPE—g—VC接枝共聚树脂的基本性能,用与PVC共混的方法,研究了CPE—g—VC作为PVC改性剂的力学性能及加工条件的关系,考察了CPE—g—VC共混物的转矩流变行为、毛细管流变行为和可挤出性。结果表明:CPE—g—VC具有许多优良特性。在PVC共混物中,CPE—g—VC较CPE有更好的增韧效果,CPE—g—VC/PVC共混物具有较CPE/PVC共混物高3～4倍左右,较纯PVC高5～8倍左右的抗冲击强度。同CPE/PVC共混物相似,CPE—g—VC/PVC共混物加工区域较狭窄。     

CPE—g—VC接枝共聚树脂加工应用研究

本文用与PVC共混的方法,研究了CPE—g—VC作为PVC改性剂的力学性能及加工条件的关系,考察了CPE—g—VC共混物的转矩流变行为、毛细管流变行为和可加工性。结果表明:CPE—g—VC树脂具有许多优良特性,例如具有较高抗冲击强度、良好耐低温性、耐老化性、热稳定性、耐燃性等。在PVC共混物中,CPE—g—VC较CPE有更好的增韧效果,CPE—g—VC/PVC共混物具有较CPE/PVC共混物高3～4倍左右,较纯PVC高5～8倍左右的抗冲击强度。同CPE/PVC共混物相似,CPE—g—VC/PVC共混物加工区域较狭窄。     

氯化聚乙烯增容剂

叙述了氯化聚乙烯的结构、增容原理及氯含量为35%的氯化聚乙烯弹性体作为不相容聚合物共混物增容剂的应用。着重介绍了氯化聚乙烯在PVC/PE、PVC/PP、PVC/EPDM、PVC/SBS、SBR/HDPE/PVC、丁腈再生胶/SBR等不相容聚合物共混体系中的实际应用。     

Properties of PVC/CPE/EPDM polyblends

A series of tricomponent blends of poly(vinyl chloride)/chlorinated polyethylene/ethylene propylene diene terpolymer (PVC/CPE/EPDM) were prepared and studied. CPE was used not only to improve the room temperature impact resistance of PVC but also as a polymer compatibilizer; while EPDM was used to enhance the impact resistance of PVC especially in low temperature range. Our data showed that the improvements of PVCs impact strength were significant either at room temperature or at low temperature (-12°C), however, a loss of the yield tensile strength was observed. On the basis of morphology, an impact-toughening mechanism of the tricomponent blend was proposed.     

高聚合度PVC／PP／相容剂共混改性体系研究

采用ＣＰＥ、ＡＢＳ和ＰＰ溶体接枝物等作相容剂恶性状聚合物ＰＶＣ／ＰＰ共混物的相容性，并考察共混比、相容剂用量、增塑剂用量、ＥＰＤＭ用量、相容剂种类对高聚合度ＰＶＣ／ＰＰ共混物力学性能和微观形态的影响。     

弹性体改性软质聚氯乙烯性能的研究

讨论了不同品种的弹性体对软质氯乙烯的改性结果，包括不同品种和不同含量的弹性体对ＰＶＣ力学性能等性能的影响，实验了得到了性能较好的改性ＰＶＣ软质材料。     

Studies of rigid poly(vinyl chloride) (PVC) compounds. IV. Fusion characteristics and morphology analyses

Poly(vinyl chloride) (PVC), PVC/chlorinated polyethylene (CPE), PVC/oxidized polyethylene (OPE), and PVC/CPE/OPE compounds were prepared in a Haake torque rheometer at various temperatures, rotor speeds, and totalized torques (TTQ). The fusion characteristics of these PVC compounds (fusion time, fusion torque, and fusion temperature) were studied. Longer fusion time results in higher fusion temperature. Higher fusion temperature results in lower fusion torque. The fusion time of PVC/OPE compounds is the longest among these PVC blends. However, the fusion time of PVC/CPE/OPE compounds is the shortest among these PVC blends. The fusion time of the PVC/CPE/OPE compound is significantly different from those of PVC, PVC/OPE, and PVC/CPE compounds at the medium starting temperature and the medium rotor speed. Scanning electron microscopy (SEM) analyses successfully revealed the surface morphological changes of the fusion of PVC, PVC/OPE, PVC/CPE, and PVC/CPE/OPE compounds. The lubrication mechanisms of these PVC compounds have also been postulated. © 1995 John Wiley & Sons, Inc.     

高分子防水卷材的应用及发展

概述了高分子防水卷材的特点,介绍了三元乙丙橡胶、聚氯乙烯、氯化聚乙烯、热塑性弹性体等防水卷材的应用及研究现状,指出了我国高分子防水卷材行业存在的问题,对高分子防水卷材行业的发展方向进行了展望。     

固相法氯化聚乙烯与聚氯乙烯共混物的形态与性能

研究了聚氯乙烯(PVC)与固相法氯化聚乙烯(CPE)共混物的应力-应变行为和冲击强度对CPE用量和氯含量的依赖关系,考察了共混物形态与性能的关系。动态力学性能和透射电子显微镜的研究结果表明,PVC/CPE为部分相容体系,两相间存在着一定的相互作用,当CPE氯含量为36％～42％,用量为7～15份时,CPE在PVC/CPE共混物中形成比较完整的网络结构、共混物具有更好的抗冲击性能。Brabender流变仪研究表明,CPE能促进PVC的塑化,共混物的加工性优于纯PVC。     

Relation between the microstructure and the dynamical mechanical properties of rigid PVC modified by chlorinated polyethylene

Dynamic mechanical properties of biphasic PVC/CPE polymer blends of different micromorphology were studied. It was revealed that a considerable interaction existed between the polymers involved in the high-impact polymer blends. It was established that the most favorable cold impact strength of the high-impact PVC/CPE alloy was obtained when a structure of mixed morphology had been formed in the course of processing. As indicated by the DMA spectra, more marked plasticizing effect of CPE appeared at a lower thickness of CPE layer among the primary globules, i.e., at a higher extent of wetting the PVC globules by CPE molecules. This phenomenon is manifested by splitting the β-relaxation transition of PVC.     

Application of phase dispersion–crosslinking synergism on recycling commingled plastic wastes

A tetra‐component blend, consisting of low‐density polyethylene (LDPE), polyvinyl chloride (PVC), polypropylene (PP), and polystyrene (PS), was studied as a model system of commingled plastic wastes (LDPE/PVC/PP/PS, mass ratio: 70/10/10/10). Effects of chlorinated polyethylene (CPE), ethylene–propylene–diene monomer (EPDM), styrene–butadiene–styrene (SBS), and their mixture (CPE/EPDM/SBS, mass ratio: 2/2/2) on the mechanical properties and morphology of the system were investigated. With addition of several elastomers and their mixture, the tensile strength of the blends decreased slightly, although both the elongation at break and the impact strength increased. Among these elastomers, EPDM exhibited the most significant impact modification effect for the tetra‐component blends. SBS and the mixture have a good phase‐dispersion effect for the tetra‐component blend. By adding a crosslinking agent [dicumyl peroxide (DCP)], the mechanical properties of the tetra‐component blends also increased. When either SBS or the mixture was added to the blend together with DCP, the probability that the crosslinking agent (DCP) would be at the interface improved because of the phase‐dispersion effect of SBS. Therefore, more co‐crosslinked products will form between LDPE and other components. Accordingly, remarkable improvement of the interfacial adhesion and hence the mechanical properties of the tetra‐component blends occurred. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 2947–2952, 2001