聚合物原位成纤方法及其在PP共混体系中的应用

介绍了聚合物共混体系原位成纤原理、影响因素、制备方法及聚丙烯(PP)与其他聚合物原位成纤共混体系研究进展,包括PP/聚酰胺(PA)、PP/聚对苯二甲酸乙二醇酯(PET)原位成纤共混体系等.重点阐述了不同共混比、相容性、黏度比和加工参数(如拉伸速率、螺杆转速、加工温度等)等对PA或PET在PP中的成纤形态和PP力学性能、...     

PBT(聚对苯二甲酸丁二酯)共混纤维的结构与性能(Ⅱ)染色性能的研究

本文应用酸性染料对PBT与PA6(聚已内酰胺)共混熔纺所得拉伸丝进行常压染色;应用分散染料对PBT与PET(聚对苯二甲酸乙二酯)共混熔纺所得拉伸丝进行高温高压染色;并与纯组分的染色行为分别进行了比较,发现PBT/PET共混纤维中一种组分的存在有利于另一组分的染色,且存在着以最终上染率为目标的组分、染色温度与升温速率最佳组合值。PBT/PA6中PBT组分的存在,影响了PA6的着色;当PBT含量较少时(10％以下),这种影响作用不大。     

PET/聚酰胺类共混体系相容性的研究

将聚对苯二甲酸乙二醇酯(PET)分别与聚酰胺类(PA1010、PA6和PA66)熔融共混,通过热力学分析、示差扫描量热法、扫描电镜和红外光谱等手段,对PET/PA类共混体系进行了研究.热力学分析结果与实验结果不同,表明热力学分析不适用于PET/PA共混体系;DSC分析结果表明:不同的PET/PA共混体系对PET相玻璃化温度向低温区移动程度有影响;SEM分析表明:PET/PA共混体系断面形态不同,相容性关系为PET/PA66>PET/PA6>PET/PA1010;红外光谱分析表明:共混体系中PET的羟基和PA分子的-NH-之间产生了氢键,导致PET的C=0拉伸震动吸收峰移向低波数.     

PBT／PET共混体系相容性研究

将聚对苯二甲酸丁二醇酯(PBT)与聚对苯二甲酸乙二醇酯(PET)熔融共混,通过粘度匹配原则, 确定PBT／PET共混体系的熔体温度为275-285℃,在283℃时制得PBT／PET共混切片,并对其共混体系进行相容性研究。结果表明:PBT／PET共混体系的理论热焓均小于41．8 mJ,为热力学相容体系;由扫描电镜观察PBT／PET共混体系在PBT和PET交界处发生了相分离,当PBT与PET共混比越接近,相分离程度越明显;DSC分析表明PBT／PET共混体系在非晶区相容,晶区不相容。     

PET/PBT共混物的结构与特性黏度变化

分别使用单螺杆挤出机、双螺杆挤出机和反应挤出机制备了不同配比的聚对苯二甲酸乙二醇酯(PET)/聚对苯二甲酸丁二醇酯(PBT)共混物,用差示扫描量热仪(DSC)、13C-核磁共振仪和乌氏黏度计对其进行了表征。结果表明,单螺杆挤出机制备的PET/PBT共混物的DSC曲线与溶液共混制备的相同,挤出过程中没有发生酯交换反应,双螺杆挤出机和反应挤出机制备的PET/PBT共混物过程中也没有发生酯交换反应;反应挤出机制备的PET/PBT共混物的特性黏度最高,双螺杆挤出机制备的特性黏度最低。     

PBT／PP—g—MAH共混体系的形态结构及力学性能

研究了马来酸酐化聚丙烯(PP-g-MAH)与聚对苯二甲酸丁二醇酯(PBT)共混物的形态结构及力学性能,并与PBT/PP机械共混体系作了比较。结果表明:马来酸酐化聚丙烯在一定程度上改善了共混物两相的分散性及界面条合性,使共混物的冲击性能有所提高。     

环氧树脂对聚对苯二甲酸丁二酯共混物的增韧增强研究

利用环氧树脂(EP)与聚对苯二甲酸丁二醇酯(PBT)的相容性,考察了EP对共混物PBT/ABS-gGMA性能的影响。采用动态力学分析仪(DMA)、旋转流变仪、Haake流变仪和扫描电镜(SEM)研究共混物的性能。DMA、DSC和旋转流变仪的测试结果表明PBT与EP是相容的;流变性能测试结果表明EP对PBT/ABS-g-GMA共混体系起到增容作用;SEM观察结果发现少量的EP加入对共混物的相形态没有明显影响,分散相在PBT基体中均匀、稳定分散,而过量的EP使共混物中出现一些较大的相区,分散相发生团聚;力学性能测试结果表明适量的EP就能明显提高共混物的冲击性能,而过量的EP又会使共混物的冲击强度下降。     

PET/PBT共混物非等温结晶行为的研究

采用差示扫描量热法(DSC)研究了聚对苯二甲酸乙二醇酯/聚对苯二甲酸丁二醇酯(PET/PBT)共混物的非等温结晶行为;研究了冷却速率对PET/PBT滑/石粉(Talc)成/核剂(P250)共混物结晶行为的影响。对其数据分别采用Jeziorny法、Ozawa法和Mo法进行处理。结果表明:PET/PBT共混物在加入滑石粉后相对结晶度(Xc)有所下降,但是结晶速率提高;PET/PBT/Talc体系单独引入成核剂体系效果更优;PET/PBT/Talc/P250体系随降温速率的增大,结晶度下降,结晶速率加快;Jeziorny法和Mo法处理非等温结晶过程比较理想,Ozawa法则具有一定的局限性。     

玻纤增强PA66/PBT合金的相形态及力学性能研究

通过熔融共混法制备了玻纤增强聚己二胺己二酸(PA66)/聚对苯二甲酸丁二醇酯(PBT)合金,研究了自制相容剂对玻纤增强PA66/PBT合金力学性能及相形态的影响。DSC及SEM结果表明,加入5%自制容剂能有效增容PA66和PBT,减少分散相的相尺寸,使合金的力学性能特别是合金的冲击性能达到甚至超过玻纤增强PA66的力学性能,同时合金的吸水率随合金体系中PBT用量的增加而大幅降低。     

PP-g-(DAP-co-GMA)的制备及PP/PET相容性研究

以邻苯二甲酸二烯丙酯(DAP)为共单体,将甲基丙烯酸缩水甘油酯(GMA)接枝到聚丙烯(PP)上,通过红外分析(FTIR)、差示扫描量热(DSC)分析、电子显微镜(SEM)观察、力学性能测试,研究了该接枝物对PP/聚对苯二甲酸乙二醇酯(PET)体系的增容作用。结果表明:DAP,GMA可共接枝到PP分子链上生成PP-g-(DAP-co-GMA);该接枝物可与PET反应生成PP-g-PET;由于该接枝物的生成,使得增容共混物中PP和PET的结晶温度及熔点降低,体系黏度增加,力学性能提高,分散相分布均匀。     

热塑性弹性体与高聚物共混物的结构与性能

：研究了热塑性弹性体——共聚醚酯（ＴＰＥＥ）与ＰＡ６，ＰＢＴ，ＰＥＴ三种高聚物共混纺丝的可纺性。对所用聚合物的热性能及流变性进行了测试与分析，研究了共混组分、配比、粘度差及机械混合条件等诸因素对纤维结构与性能的影响。     

PET/PBT共混体系的纺丝性能及纤维性能研究

选取 PET/ PBT配比 90 / 10的共混物作为纺丝实验样品 ,采用常规纺丝及后加工工艺对其纺丝性能进行了研究 ,采用 DSC、SEM、X-衍射以及常规物性测试方法对共混纤维的常规性能和微观结构进行了研究表征。结果表明 ,PET/ PBT共混体系在本文实验条件下具有良好的可纺性和后加工性能 ,纤维的各项指标均接近或超过 DT丝一等品的要求 ,其结晶速度快和结晶度较高的特性是影响其纤维性能的关键。     

PA6/PET共混体系的动态力学性能

应用粘弹谱仪研究了ＰＡ６／ＰＥＴ共混体系的动态力学性能,结果表明：ＰＡ６和ＰＥＴ的β损耗峰温相近,其共混物只观察到一个损耗峰,但峰宽随ＰＥＴ组分增加而增宽;相应于束缚非晶区分子链段运动的α损耗峰（αⅠ）只有一个,其峰温依加和律线性变化,说明在束缚非晶区内相溶：相应于自由非晶区分子链段运动的α损耗峰有两个（αⅡ和αⅢ）,随ＰＥＴ组分增加,αⅡ损耗峰温升高而αⅢ的降低,因此ＰＡ６和ＰＥＴ在自由非晶区是部分相溶的     

PBT/PA6共混体相容性的研究

通过理论分析、示差扫描量热法、红外光谱、广角X射线衍射和扫描电镜等手段,对PBT/PA6共混体进行了研究。理论分析结果表明:PBT/PA6共混体在组成0.3相似文献   

A study on the use of phenoxy resins as compatibilizers of polyamide 6 (PA6) and polybutylene terephthalate (PBT)

In this study we investigated the potential of phenoxy resins as compatibilizers in the blending of two high‐volume engineering thermoplastics—polyamide 6 (PA6) and polybutylene terephthalate (PBT), in an effort to establish the usefulness of blending as a method of recycling of mixed plastic wastes. It was found that phenoxy resins formed miscible blends with PBT, formed grafted copolymers with PBT through ester exchange reactions, and—though formed immiscible blends with PA6—produced energetic interactions in the form of hydrogen bonding with PA6. The ternary blend systems of 70 parts PA6, 30 parts PBT, and respectively 5, 10, and 30 parts phenoxy resins, all by weight, revealed at two‐phase nature—PA6 as the continuous phase and miscible blends of PBT and phenoxy resins as the dispersed phase—and were found to be stable to phase coarsening by annealing with mechanical properties at least as good as those of the component polymers.     

Blends of poly(ethylene terephthalate) and poly(butylene terephthalate)

Commercial grade poly(ethylene terephthalate), (PET, intrinsic viscosity = 0.80 dL/g) and poly(butylene terephthalate), (PBT, intrinsic viscosity = 1.00 dL/g) were melt blended over the entire composition range using a counterrotating twin‐screw extruder. The mechanical, thermal, electrical, and rheological properties of the blends were studied. All of the blends showed higher impact properties than that of PET or PBT. The 50:50 blend composition exhibited the highest impact value. Other mechanical properties also showed similar trends for blends of this composition. The addition of PBT increased the processability of PET. Differential scanning calorimetry data showed the presence of both phases. For all blends, only a single glass‐transition temperature was observed. The melting characteristics of one phase were influenced by the presence of the other. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 75–82, 2005     

Effect of Blend Ratio and Draw Ratio on the Mechanical Properties of PET/PP Blended Conjugate Fibers

This study analyzes the influence of blend ratio and draw ratio on the fiber properties of blend fibers composed of poly (ethylene terephthalate), or PET, and polypropylene, or PP, (hereafter referred to as PET/PP conjugate fibers). For a comparison, PET and poly (butylene terephthalate), or PBT blends, (hereafter referred to as PET/PBT conjugate fibers) are also investigated. Various blend ratios of fibers are melt spun and drawn in a multistep drawing method. The conjugate fibers are evaluated using tenacity, Young's modulus, wide-angle X-ray diffraction, differential scanning calorimetry (DSC), and scanning electron microscopy (SEM) tests. The results show that multistep drawing using a lower first-step draw ratio provides a higher tenacity and Young's modulus. Furthermore, when the blend ratio is 75/25 in a PET/PP conjugate fiber and 50/50 in a PET/PBT conjugate fiber, the polymer components undergo a phase inversion phenomenon. A PP sub-micron (10^?1 ～ 10⁰ micron) fiber of about 0.0001 ～ 0.00017 tex in fineness, or about 0.4 ～ 0.5 micron in diameter, can be obtained when PET/PP conjugate fiber is treated with a 25% NaOH aqueous solution by weight. However, A PBT sub-micron fiber cannot be achieved using a PET/PBT conjugate fiber.     

Rheological behavior of polyester blend and mechanical properties of the polypropylene–polyester blend fibers

The article deals with method of preparation, rheological properties, phase structure, and morphology of binary blend of poly(ethylene terephthalate) (PET)/poly(butylene terephthalate) (PBT) and ternary blends of polypropylene (PP)/(PET/PBT). The ternary blend of PET/PBT (PES) containing 30 wt % of PP is used as a final polymer additive (FPA) for blending with PP and subsequent spinning. In addition commercial montane (polyester) wax Licowax E (LiE) was used as a compatibilizer for spinning process enhancement. The PP/PES blend fibers containing 8 wt % of polyester as dispersed phase were prepared in a two‐step procedure: preparation of FPA using laboratory twin‐screw extruder and spinning of the PP/PES blend fibers after blending PP and FPA, using a laboratory spinning equipment. DSC analysis was used for investigation of the phase structure of the PES components and selected blends. Finally, the mechanical properties of the blend fibers were analyzed. It has been found that viscosity of the PET/PBT blends is strongly influenced by the presence of the major component. In addition, the major component suppresses crystallinity of the minor component phase up to a concentration of 30 wt %. PBT as major component in dispersed PES phase increases viscosity of the PET/PBT blend melts and increases the tensile strength of the PP/PES blend fibers. The impact of the compatibilizer on the uniformity of phase dispersion of PP/PES blend fibers was demonstrated. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 4222–4227, 2006     

PET—PBT嵌段共聚酯的结构性能研究

本文报告了用PSC法和X衍射法等对PET—PBT嵌段共聚酯的结构性能,特别如热性能和结晶性能等的研究结果.实验结果表明,不同PBT组份含量的共聚酯熔点变化呈V字形曲线,在摩尔比为50/50时熔点最低.结晶动力学研究表明,当共聚酯中PBT含量为10%时,结晶速率比常规PET有明显增高.X衍射分析还表明,拉伸对共聚酯结晶的发展有明显的诱导效应,尤其是C轴方向的晶粒尺寸增长.