橡胶增韧滑石粉填充聚丙烯塑料改性的研究

从聚丙烯的增强增韧性性出发，用改性后的聚丙烯在某些应用领域代替ＡＢＳ工程塑料。研究方法是将聚丙烯同经偶联剂处理的滑石粉以及橡胶进行共混。     

EVA－15对聚丙烯的共混改性研究

应用ＳＥＭ和力学性能测试研究了ＥＶＡ－１５对聚丙烯共混物原料配比、工艺条件和微观结构形态对材料性能的影响，对共混物的增韧机理进行了分析。研究结果表明：ＥＶＡ－１５对聚丙烯有很好的增韧改性效果，其综合性能优良．这一研究为拓宽聚丙烯改性材料的应用提供了一种新的方法，符合当今高聚物增韧发展的趋势．     

EVA-15对聚丙烯的共混改性研究

应用SEM和力学性能测试研究了EVA-15对聚丙烯共混物原料配比、工艺条件和微观结构形态对材料性能的影响，对共混物的增韧机理进行了分析。研究结果表明：EVA-15对聚丙烯有很好的增韧改性效果，其综合性能优良．这一研究为拓宽聚丙烯改性材料的应用提供了一种新的方法，符合当今高聚物增韧发展的趋势．     

超细碳酸钙对PVC／ABS二元体系增韧改性的探讨

实验采用了非弹性体增韧的概念，利用无机刚性粒子超细碳酸钙（ＣａＣＯ３）对ＰＶＣ／ＡＢＳ体系进行增韧改性。结果表明，ＣａＣＯ３用量为１５份时，共混物的韧性有较大幅度的提高。实验还考察了不同共混温度对体系增韧效果的影响。此外，运用Ｊ积分法对ＰＶＣ／ＡＢＳ／ＣａＣＯ３体系韧性进行了表征     

改性聚丙烯纤维的染色性

将ＲＳＭ－１和Ｅ与聚丙烯共混,制得分散染料可染改性聚丙烯纤维．讨论了共混物组分和组成对共混纤维染色性能的影响．结果表明,ＲＳＭ－１和Ｅ对提高改性聚丙烯纤维的染色性均有明显效果．     

聚丙烯三元共混体力学性能的研究

研究了乙丙橡胶（ＥＰＲ）对于乙丙橡胶、高密度聚乙烯（ＨＤＰＥ）和聚丙烯（ＰＰ）三元共混体的增韧作用和共混体混炼时间对力学性能的影响．试验表明，该共混体简支梁缺口冲击强度比纯聚丙烯提高５倍以上①．     

改必聚丙烯纤维的染色性

将ＲＳＭ－１和Ｅ与聚丙烯共混,制得分散染料可染改性聚丙烯纤维。讲座了共混物组分和组成对共混纤维染色性能的影响,结果表明,ＲＳＭ－１和Ｅ对提高高改性聚丙烯纤维的染色性均有明显效果。     

添加剂对汽车保险杠用再生聚丙烯改性的影响

以RPP(增强聚丙烯)为研究对象,在不同增韧剂及偶联剂改性纳米级碳酸钙的条件下,采用共混法制备了一系列改性的RPP.以乙烯-辛烯共聚物(POE)为增韧剂,以纳米级碳酸钙(nano-CaCO3)为无机填料对RPP的共混改性工艺进行研究,探讨了两种物料对RPP力学性能的影响,确定了最佳的配比及工艺参数.试验结果表明:两种物料对RPP都具有良好的增韧效果,用POE、nano-CaCO3共同作用的效果优于只使用POE作为增韧剂的改性效果.加入适量用偶联剂活化处理的nano-CaCO3,可以提高共混物的力学性能,以钛酸酯为偶联剂活化nano-CaCO3并与POE按摩尔比1∶1混合,当两者在RPP/POE/nano-CaCO3三元共混体系中质量分数为25％时改性RPP材料的冲击强度达到最大值,为原先未添加任何添加剂时强度的2.5倍左右.     

刚性有机粒子增韧改性PVC共混物的研究

本文对刚性有机粒子ＡＳ增韧改性的ＰＶＣ／ＣＰＥ及ＰＶＣ／ＥＶＡ－Ｇ－ＶＣ共混物进行了研究，实验结果表明，填加少量的刚性聚合物不仅可使ＰＶＣ韧性体的冲击强度有较大提高，而且可使材料拉伸弹性模量有一定程度的回升。证明它具有非弹性体增韧高聚物的规律和特征。本文从原料及共混工艺等方面探讨了各因素对三元共混物力学性能的影响。     

高抗冲聚丙烯的研制与应用

较系统地介绍了高抗冲聚丙烯的研制过程,并详细论述了各种填加剂和助剂对改性材料性能的影响．结果表明：用三元乙丙橡胶和苯乙烯-丁二烯-苯乙烯嵌段共聚物协同改性聚丙烯可以大大提高材料的抗冲击性;填加经偶联剂表面处理的滑石粉可以提高材料的刚性、尺寸稳定性及热变形温度等多种性能,进而解决了聚丙烯改性过程中材料抗冲击性能提高,而刚性下降的矛盾．     

Preparation of ultra-nano talcum in sand mill and its application in the polypropylene

The grinding of ultra-fine talcum powder and its application in a polypropylene (PP) matrix were investigated. Ultra-fine talcum powder was prepared by adjusting the grinding parameters of the physical milling process. The talcum powder exhibited polymodal distribution. The layered morphology of talcum particles in a horizontal sand mill was rarely damaged or destroyed. PP-talcum nanocomposites were prepared by melt blending using a twin-screw extruder. Nano talcum can be seen as a single particle, although it is not very apparent. The bending strength of talcum-filled PP was gradually increased by approximately 28%. The impact strength linearly decreased as the filler weight ratio increased. The overall maximum improvement in mechanical properties was recorded when the filler ratios increased from 15 wt% to 20 wt%.     

Hybrid modified rubber powder and its application in cement mortar

This research focused on using the waste rubber powder as a kind of regenerate resources to improve the mechanical properties of cement mortar. The two kinds of hybrid modified rubber powder TRP and ATRP were prepared by sol-gel method and then used in cement mortar. The structures and properties of them were studied. It is shown that the nano Si-O-Si network is generated in TRP and ATRP networks and the hydrophilic group is grafted on the surface of ATRP. The mechanical properties of rubber-treated mortar (RTM) were tested and the microstructures of them were also studied. Compared to the mortars with unmodified rubber powders (RP), NaOH treated rubber powder (SRP) and coupling agent treated rubber powder (CRP), the RTM with ATRP has the highest compressive strength and flexural strength. The stress-strain curves shown that the peak of stress of RTM with ATRP is increased and indicated the higher compression deformation and toughness. It is found that the interfacial adhesion between the ATRP and cement mortar is increased distinctly by SEM, which results in enhanced ductility and mechanical properties of RTM with ATRP.     

ABS/PMMA合金性能研究

采用ABS/SAN/PMMA熔融共混的方法制备了不同配比的ABS/PMMA合金,就其组成、加工工艺条件对性能的影响进行了详细地研究.结果表明,ABS中引入PMMA可提高合金的拉伸强度,但在一定程度上降低了缺口冲击强度,当胶含量为12%时,合金产生脆韧转变.同时,注塑工艺条件对其力学性能也有一定影响.     

纳米碳酸钙对回收丙烯腈-丁二烯-苯乙烯共聚物性能的影响

利用熔融共混方法制备出纳米碳酸钙/回收丙烯腈-丁二烯-苯乙烯复合材料,采用偶联剂对纳米碳酸钙表面改性,或加入增容剂马来酸酐接枝(丙烯腈/苯乙烯)共聚物(AS-g-MAH),得到力学性能较好的纳米碳酸钙/回收丙烯腈-丁二烯-苯乙烯复合材料.研究了纳米碳酸钙含量、偶联剂、增容剂AS-g-MAH对回收丙烯腈-丁二烯-苯乙烯(ABS)力学性能的影响.实验结果表明:与新料ABS相比,回收的ABS性能有所下降.纳米碳酸钙含量为ABS质量的2%,硅烷偶联剂含量为纳米碳酸钙质量的5%,或增容剂AS-g-MAH为纳米碳酸钙质量的2%时,回收ABS的力学性能最佳.扫描电镜显示加入增容剂AS-g-MAH后,纳米碳酸钙粒子能均匀混合在回收ABS中,且粒径分布较窄,分散性好;无增容剂时有纳米碳酸钙团聚粒子出现.     

阻燃填充剂对ABS塑料性能的影响

研究了阻燃剂与填充剂对ＡＢＳ塑料的燃烧性能和力学性能的影响，研究结果表明，四溴双酚Ａ／三氧化二地ＡＢＳ塑料具有较好的阻燃效果，冲击强度损失少，拉伸强度略有下降，综合性能好。加入滑石粉对ＡＢＳ的热变形温度有提高。     

不同偶联剂对秸秆／PP复合材料力学性能的影响研究

通过对秸秆粉的质量分数、偶联剂的种类及其含量等因素的控制,研究上述因素变化对PP／秸秆粉基木塑复合材料的各项力学性能的影响．研究结果表明：四种不同偶联剂中马来酸酐接枝聚丙烯（MAPP）的效果最好;当秸秆粉质量分数达到30％时,木塑复合材料的抗弯强度、抗拉强度、抗冲击强度均为最佳;采用MAPP作为偶联剂且含量为秸秆粉的4％时,材料的抗弯、抗拉强度、抗冲击强度均为最佳,当MAPP含量超过4％时,材料的力学性能会有所下降．     

Effects of Silane Coupling Agent on Microstructure and Mechanical Properties of EPDM/Carbonyl Iron Microwave Absorbing Patch

The effects of types and amounts of silane coupling agent on mechanical properties of vuleanized rubber microwave absorbing patch （VRMAP） were studied. The mechanisms of silane coupling agent＇s effects on mechanical properties of rubber microwave absorbing patch （ RMAP ） and microvave absorbing patch＇s （MAP＇s） mierostrueture were also discussed by using SEM and FT-IR. The experimental results show that the tensile strength of RMAP could be increased through adding the filler of carbonyl iron powder （CIP） modified by silane coupling agent. RMAP fiUed with CIP, which was treated by silane coupling agent KH550, possessed a high tensile strength of 11.5 MPa, which was 448% more than that of MAP whose filler wus not modified by any coupling agent. It was found that the optimal amount of KH550 was 1.0 phr to 100.0 phr carbonyl iron powder. The effects of different modifying techniques on RMAP＇s mechanical properties were also inrestigated. It is indieated that MAP whose filler is modified by the wet process has the highest tensile strength, but it is not the optimal modiifying technique due to complieated wet process. On the contrary, the dry process was very simple, and VRMAP possessed fairly high mechanical properties, therefore, it was the perfect modifying process.     

废旧轮胎胶粉对水泥砂浆力学性能的影响

研究了废旧轮胎胶粉的细度、掺量对水泥砂浆抗压强度的影响．利用不同的硅烷偶联剂对废轮胎胶粉进行了改性试验，并测定了改性胶粉对水泥砂浆力学性能的影响．研究结果表明：掺胶粉水泥砂浆28d抗压强度有明显下降，但掺量小于10％时，对水泥砂浆的早期强度几乎没有影响；在等掺量条件下，胶粉越细，砂浆强度越高；胶粉经改性后能明显改善掺胶粉水泥砂浆的力学性能．     

改性PC／ABS塑料合金的制备及力学性能研究

采用熔融共混工艺路线,选用合适的PC,ABS和相客剂,制备了PC／ABS合金材料,通过DSC和力学性能测试对所得到的舍金材料进行了结构及力学性能表征。结果表明,PC与ABS为部分相客体系,加入相容剂ABS—g—MAH和PE—g—MAH,可以改善合金的相容性,从而提高了合金材料的综合力学性能。ABS—g—MAH的改性效果要好于PE—g—MAH,ABS—g—MAH中的ABS部分与PC／ABS舍金中的ABS相具有相似结构,并且酸酐基团可以与PC发生酯交换反应,因而可以更好的融入PC相中,提高了两相的界面黏结力而导致力学性能的提高。     

ABS/PBT共混合金体系的研制

以ABS、PBT为基体树脂，RC为增容剂，NBR为增韧改性剂，并加入其它助剂，制备了ABS／PBT共混合金。研究了PBT的含量、ABS的牌号、相容剂和NBR的含量对ABS／PBT共混合金力学性能的影响。结果表明：用35％的PBT去改性不同牌号的ABS，与不加相容剂的状况比较，相容剂对ABS／PBT共混合金增容后，拉伸强度和弯曲强度分别提高11．2％和12．2％，共混合金的相分散性好，形态结构稳定。弹性体与相容剂协同作用，显著提高材料的韧性。加入20份NBR时，共混合金的断裂伸长率提高412．1％，冲击强度提高72．5％。并且在一定程度上克服了增韧对材料拉伸强度等性能造成的损失，起到了优化材料性能的目的。