预聚甲基丙烯酸甲酯／丁苯橡胶对聚苯乙烯基高聚物材料光散射性能的影响

以预聚甲基丙烯酸甲酯(MMA)/丁苯橡胶(SBR)为散射剂、聚苯乙烯(PS)为基体制备了高聚物光散射材料,研究了预聚MMA和SBR的添加量对高聚物材料光散射性能的影响.结果表明,当SBR为0.02%、预聚MMA为0.04%-0.08%时,可得到透光率不小于75%、雾度不小于80%的以PS为基体的高聚物光散射材料;预聚MMA的添加量与高聚物光散射材料的雾度呈现较强烈的振荡变化关系,和透光率之间的振荡变化关系略弱;sBR添加量和高聚物光散射材料的雾度之间呈现振荡变化关系,和透光率之间则没有明显的振荡变化关系.     

全程动态注射对无规非晶型PS制品聚集态结构与性能影响的研究

在实际生产的条件下,在振频0~12Hz,振幅0~0.30mm的范围内系统地研究了振动参数的变化对无规非晶型聚合物PS(GPPS)宏观力学性能和聚集态结构的影响规律。根据所获得的宏观和微观信息,总结了无规非晶型PS制品的力学性能对于振动参数变化的响应规律,并首次提出了一个较为直观的“分子链双重交织取向”物理结构模型,阐述了振动参数、聚集态结构和宏观力学性能三者间的联系,对典型无规非晶型高聚物性能与振动力场间响应变化规律的结构原因进行了较为深入的探索及合理的解释。     

互穿网络高聚物

互穿网络高聚物(简称 IPN)是一种改性的高聚物新品种,是通过化学方法将两种或两种以上的高聚物互穿成网络状的一种复相高聚物材料。不同的 IPN 有不同的相态结构。二相的连续性、相畴性的大小、互穿等主要决定于二种聚合物组份的相容性,交联密度,聚合方法和组成比等因素。其物理及力学性能不但与组份的性能有关,且与相态结构及相间的相互作用     

塑料粉末烧结件的增强后处理性能研究

以聚苯乙烯(PS)粉末为基底材料的快速烧结原型件力学性能较差,通常达不到使用要求,为改善其力学性能,采用浸渍环氧树脂(EP)固化体系增强后处理的方法,使部分EP浸入原型件的空隙中,利用扫描电子显微镜对材料断裂面的形态结构进行了研究,并对测试件的拉伸性能、冲击性能等进行了测试,证明原型件经增强后处理,各项性能都得到了很大的改善.     

间规聚苯乙烯——优良的工程塑料

聚苯乙烯(PS)由于聚合方法不同,可以制得无规聚苯乙烯(aPS)、全同立构的聚苯乙烯(iPS)和间规聚苯乙烯(SPS)。这三者属于同一种单体的结晶高聚物和非晶态高聚物,它们在化学结构上虽没有什么差别,但物理力学性能却有相当大的不同。常见的通用聚苯乙烯(GPPS)主要就是aPS,它不能结晶,耐热性能较差,软化温度为80℃。而sPS却有较高的结晶度,熔点高达270℃,并且具有相当好的耐热性、耐化学性、     

聚酚氧塑料合金的研究—聚甲基丙烯酸甲酯和聚苯乙烯体系

本文研究了 Phenoxy/PMMA,Phenoxy/PS 共混物的力学性能和形态,讨论了 PMMA、PS 二种脆性高聚物做为分散相时,对 Phenoxy 的增韧的作用,结果表明 PMMA 对 Phenoxy 有明显的增韧效果,PS 的存在亦只能提高 Phenoxy 的断裂伸长率。     

建筑用可降解聚苯乙烯复合塑料板的制备与保温性能研究

利用TiO_2与氧化石墨烯(GO)制备二氧化钛/石墨烯(TiO_2-GR)材料,并将其与聚苯乙烯(PS)共混发泡制备可降解PS复合材料,并对PS复合材料的形貌、力学性能、保温性能以及可降解性能进行表征。结果表明:4号样品具有最低的导热系数0.032 W/(m·K),具有最佳的保温性能。力学性能方面,4号样品具有最佳的压缩强度以及冲击强度,分别达到7.1 MPa和19.8 kJ/m2。4号样品在光照下具有较好的可降解性能,在120 min光照下,其降解率达到48.2%。4号样品满足建筑保温材料的要求,并且其废弃后,可以有效通过光照进行降解,具有环保性。     

扭辫法测试聚酯动态力学谱

<正> 根据Gillham提出用扭辫分析法(Torsional Braid Analys is简称TBA法)测定高聚物材料的动态力学谱,了解高聚物材料动态力学性质,获得高聚物结构和性能方面的某些信息,从而对材料的加工和使用,能作出正确的判断。TBA法可以在非常广泛的温度范围内进行连续测定,所以较一般静态法更能直观而且连续地反映出高聚物材料的热机械性能。目前,TBA法在研究高聚物材料的力学性能方面已成为重要的方法之一。     

热空气老化对苯基硅橡胶阻尼特性的影响

研究了不同老化温度(300℃、320℃、330℃、340℃、350℃)下,短时(30 min)热空气老化对苯基硅橡胶(PS5360)硫化胶老化性能的影响。采用低场NMR橡胶交联密度测定仪研究了老化前后PS5360硫化胶的交联密度变化。测试了其在老化前后的物理力学性能变化。依据不同的应用环境,使用动态热机械分析仪分别在20℃和110℃下测量了老化后PS5360硫化胶的动态力学性能。结果表明:随着短时老化温度的提高,PS5360硫化胶在中低频(5~150 Hz)环境下的介质损耗因数逐渐提高,交联密度逐渐降低,物理力学性能逐渐下降。     

极性化SBS/PS/超细CaCO_3补强热塑性弹性体的性能及其微观形态研究

采用极性化SBS(PSBS),通过熔融共混法制备了PSBS/PS/超细CaCO3补强热塑性弹性体,研究了该材料的加工流动性能和力学性能,对比了未处理和经分散活化处理的超细CaCO3对该材料性能的影响,并观察了材料的微观形态.结果表明,PSBS与PS共混,可有效提高加工流动性.PSBS/PS共混热塑性弹性体因两者"S"微区相容性好、PB段和PS段形成"物理交联区",使拉伸强度、弯曲强度随PS用量的增加而提高.超细CaCO3能有效提高PS-BS/PS的拉伸强度与弯曲强度,其中,添加经分散活化处理的超细CaCO3后的PSBS/PS的上述补强效果更好.当PS质量分数在30%～40%,超细CaCO3质量分数为25%～30%时,PSBS/PS/超细CaCO3补强热塑性弹性体的综合性能最为理想.     

Blue Light Emission from Pulsed Laser Ablated Polystyrene

Thus far, pulsed laser ablation has been widely applied to the surface modification of polymers, but no work has been done for fluorescence performance of polystyrene ablated by pulsed laser. In this paper, a 1064 nm pulsed laser was used to ablate polystyrene. Compared to non-ablated polystyrene, the ablated polystyrene gave off obvious blue light under UV lamp irradiation. The morphology and structure of ablated and non-ablated polystyrene were studied by Fluorescence spectroscopy and IR. The results showed that the maximal emission wavelength of ablated polystyrene was 403 nm, which showed that blue light emission occurred. Because of ablation the surface chemical structure of polystyrene was changed and new C=C existed in the surface of ablated polystyrene. And the photoluminescent material was dissolvable, not cross-linked.     

线型聚苯乙烯支载手性咪唑烷酮的制备

以N-叔丁氧羰基-L-酪氨酸乙酯为原料,经系列反应制备(S)-4-[4′-(对乙烯基苄氧基)苄基]-1-苯基-2-咪唑烷酮手性单体,用AIBN作引发剂,与苯乙烯溶液聚合制备线型聚苯乙烯支载的手性咪唑烷酮,用IR、1H-NMR、13C-NMR及元素分析对其结构进行表征,所得数据与其结构相吻合。     

HIPS回收料的增韧改性研究

高抗冲聚苯乙烯(HIPS)是由弹性体改性聚苯乙烯制成的热塑性材料,HIPS是最便宜的工程塑料之一。而对于HIPS回收料来说,其性能相对于新料降低了很多,特别是冲击强度。本研究主要是通过添加SBS、蒙脱土、SMA对HIPS回收料进行增韧改性,同时采用多组对比的方法对HIPS回收料的性能进行比较,研制出综合性能达到甚至超越HIPS新料的HIPS回收料改性树脂。通过实验分析,当SBS添加8份,SMA添加3份,蒙脱土添加3份时其综合性能特别是冲击强度得到改善。     

Analysis of the phase partitioning of additives in rubber‐modified plastics

The phase partitioning of additives in polymer blends has a large impact on the performance of the blend. Therefore, it is necessary to be able to quantify the level of the additives in each phase. A ¹H–NMR method is presented to determine the partitioning of additives between the rubber and rigid phases of a high‐impact polystyrene (HIPS) material. In one case, a HIPS material was modified with 2,6‐di‐tert‐butyl‐4‐methyl‐phenol (Ionol, CAS# 128‐37‐OMF) as a stabilizer for both phases. HIPS materials with varying levels of Ionol were melt‐blended by extrusion and the total level of additives was determined analytically for these standard materials. The ¹H–NMR method was used to determine the level of Ionol in the poly(butadiene) rubber phase. The Ionol was found to preferentially partition into the rubber phase with a partition coefficient of about 2. A second example of the same concept, instead utilizing ¹³C–NMR, involved the analysis of the partition coefficient for both Tinuvin P and Tinuvin 770 (CAS# 2440‐22‐4 and 52829‐07‐9), partitioning between the rigid and rubber phases of an ethylene–propylene–diene‐modified (EPDM) toughened styrene–ran–acrylonitrile (SAN) copolymer. The partition coefficient was determined to be 0.5 for Tinuvin P and 1.3 for Tinuvin 770. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 1963–1970, 2001     

室温硫化聚苯乙烯接枝改性硅橡胶的研究

以端羟基聚苯乙烯接枝改性聚二甲基硅氧烷(PS-PDMS)为基胶,加入气相法白炭黑、正硅酸乙酯和二月桂酸二丁基锡,配成脱醇型双组分室温硫化聚苯乙烯接枝改性硅橡胶。研究了PS-PDMS的结构、力学性能和耐高温性能。29Si NMR和1H NMR分析证实,PS-PDMS的结构是以交替排列的Si—O键为主链、侧链为部分甲基被聚苯乙烯取代的接枝共聚物。相比甲基硅橡胶,PS-PDMS硫化胶的力学性能显著提高,耐热性大幅下降。未补强PS-PDMS硫化胶的拉伸强度在2 MPa以上,拉断伸长率在120%以上;气相法白炭黑用量在30份时,PS-PDMS硫化胶的拉伸强度在5 MPa以上;PS-PDMS硫化胶在热质量损失率为5%和20%时的温度分别比甲基硅橡胶低60℃和118℃。     

生物基聚己二酸戊二胺聚合物结构及高速纺长丝性能

生物基聚己二酸戊二胺(聚酰胺56)是由生物基戊二胺和石油基己二酸聚合而成,通过核磁共振、红外光谱、元素分析表征了生物基聚酰胺56的结构,通过差示扫描量热分析、热重分析研究了生物基聚酰胺56的热性能,采用高速纺丝、拉伸两步法进行纺丝试验,并测试了其物理性能。与现有石油基聚酰胺66、聚酰胺6的性能相比,生物基聚酰胺56可纺性良好,纤维的力学性能较好,亲水性能优于聚酰胺6和聚酰胺66,是一种具有广泛应用前景的生物质纤维材料。     

Probing the degree of crosslinking of a cellulose based superabsorbing hydrogel through traditional and NMR techniques

The network structure of a cellulose-based superabsorbing material has been probed by using three different techniques: ¹³C solid state NMR, free swelling in water and uniaxial compression of water swollen samples. A good agreement between the three apporaches has been found in terms of concentration of crosslinks per unit volume.The results have been discussed taking into account that NMR technique is able to detect only chemically effective crosslinks while free swelling and compression are sensitive to elastically effective physical and chemical crosslinks.A depression of swelling capacity and an apparent increase of degree of crosslinking with time, promoted by ageing of the cellulosic material, has been experimentally evidenced and discussed in terms of development of intermolecular physical interactions.     

A comparative study of the preparation and physical properties of polystyrene–silica mesocomposite and nanocomposite materials

In this paper, a comparative study with regard to the preparation and physical properties of as‐prepared polystyrene–silica mesocomposite (PSM) and polystyrene‐silica nanocomposite (PSN) materials is presented. Vinyl‐modified mesoporous silica particles with a wormhole structure were first prepared by doping a sol‐gel metal oxide with an optically active non‐surfactant (dibenzoyl‐L ‐tartaric acid) as a template, followed by template removal through Soxhlet extraction. The as‐prepared silica particles with/without mesopores were subsequently characterized using the Brunauer–Emmett–Teller method and transmission electron microscopy (TEM) and Fourier transform infrared, ¹³C NMR and ²⁹Si NMR solid‐state spectroscopy. A specific feed amount of silica particles was subsequently reacted with styrene monomer by free radical polymerization to yield a series of PSM and corresponding PSN materials. Both as‐prepared composite systems were further characterized using TEM and scanning electron microscopy/energy‐dispersive X‐ray mapping studies. A systematic comparative study of the physical properties of both as‐prepared composite materials clearly illustrated that PSM had effectively enhanced thermal stability, optical clarity and dielectric properties compared to the corresponding PSN counterpart. Evaluation was carried out using thermogravimetric analysis, differential scanning calorimetry, UV‐visible transmission spectroscopy and dielectric constant measurements. Copyright © 2011 Society of Chemical Industry     

苯乙烯在MCM-41介孔材料中聚合的研究

The polymerization of styrene in the media of MCM-41 is carried out by means of host-guest polymerization of styrene in MCM-41 mesoporous material with the aim to investigate the effects of interface and confinement of MCM-41 on host-guest interactions. Detailed physical properties of the mesoporous MCM-41 material containing polystyrene is characterized by XRD(X-ray diffraction), FT-IR(Fourier transform infrared), TGA(thermal gravimetric analysis), and nitrogen adsorption-desorption isotherms. We also find a great increase in the glass transition temperature of guest polystyrene influenced by the confined geometry of the host by differential scanning calorimetry(DSC).