PC/PET/PE-g-MAM三元共混体系流动性的研究

以ＰＥｇＭＡＨ 和ＰＥｇＭＡＮａ 、ＰＥｇＭＡＺｎ 马来酸盐离聚物为相容剂组成ＰＣ／ＰＥＴ／ＰＥｇＭＡＭ 三元共混体系。用毛细管流变仪研究了不同ＰＥｇＭＡＭ 的接枝率及用量对共混物流动性的影响,结果表明：马来酸盐离聚物增强了ＰＣ 和ＰＥＴ 间的相容性,当其含量或接枝率较大时,可以显著降低ＰＣ／ＰＥＴ 共混物的表观粘度,提高体系的流动性,相同接枝率的ＰＥｇＭＡＮａ 对共混体系表观粘度的影响更为显著。     

PC／PET／PE—g—MAM三元共混体系流动性的研究

以ＰＥ－ｇ－ＭＡＨ和ＰＥ－ｇ－ＭＡＮａ、ＰＥ－ｇ－ＭＡＺｎ马来酸盐离聚物为相容剂性组成ＰＣ－ＰＥＴ／ＰＥ－ｇ－ＭＡＭ三元共混体系。用毛细管流变仪研究了不同ＰＥ－ｇ－ＭＡＭ的接枝率及用量对共混物流动性的影响。     

熔融共混PPS／PEEK中PPS组分的结晶行为

采用熔融共混法制备结晶／结晶共混体系ＰＰＳ／ＰＥＥＫ，并用差示扫描量热法研究了不同ＰＥＥＫ含量和不同ＰＥＥＫ粒径对ＰＰＳ／ＰＥＥＫ共混物中ＰＰＳ组分结晶行为的影响。随ＰＥＥＫ含量的增加ＰＰＳ的结晶温度提高，结晶峰宽增加。这是由于在降温过程中ＰＥＥＫ先结晶，可充当ＰＰＳ熔体结晶的异相晶核，使ＰＰＳ结晶温度提高，且随着ＰＥＥＫ含量增加，异相晶核密度增大，但ＰＥＥＫ晶区的存在阻碍了ＰＰＳ的结晶生长过程，     

SPET离聚物与尼龙6共混纤维结构性能的研究

将分子链相对较为刚性的ＳＰＥＴ离聚物与尼龙６(ＰＡ６)进行共混纺丝实验,通过ＷＡＸＤ、ＤＳＣ、Ｓ－Ｓ曲线的测定等方法着重考察了体系中离子基团的引入对共混物结晶性、晶体结构、力学性能等的影响,结果表明:离聚物的存在有利于体系结晶成核,但也在一定程度上破坏了晶区的完善性。ＳＰＥＴ/ＰＡ６共混纤维的初始模量随其所含离聚物量的增多而下降。     

离聚体对PA1010／PS共混体系相形态及结晶的影响

采用ＳＥＭ,ＤＳＣ和偏光显微镜等方法研究了磺化聚苯乙烯及其锂盐,锌盐和钠盐（ＰＳ－ＮａＳ）;四种离聚体对ＰＡ１０１０／ＰＳ共混体系相形主结晶性能的影响。结果表明,对于ＰＡ１０１０／ＰＳ（８０／２０）共混体系,四种离聚体的增容效果依次按ＰＳ－ｎａＳ〈ＰＳ－ＺｎＳ〈ＰＳ〈ＺｎＳ〈ＰＳ－ＬｉＳ〈ＰＳ－ＨＳ的顺序递增,表明离聚体的离子交联能力越弱,其增容效果越好。四种离聚体中只有ＰＳ－ＺｎＳ对ＰＡ１０１０     

PET／离聚物共混过程中的化学反应及共混物的分子量和分子量分布

本文利用ＦＴＩＲ、ＧＰＣ研究了离聚物与ＰＥＴ共混过程中的化学反应及共混物的分子量及分布。实验结果表明，ＰＥＴ与离聚物在溶融共混过程中部分反应生成ＰＥＴ─Ｒ。共混物的分子量及分布随离聚物的种类和含量改变而呈现规律性变化。     

PET/PBT扩链反应共混物的结晶熔融行为

用差示扫描量热法（ＤＳＣ）考察了添加扩链剂进行反应性共混后ＰＥＴ／ＰＢＴ的结晶熔融行为。共混体系的特性粘数随反应时间的增加先升后降,冷结晶温度随时间的增加逐渐升高,熔体结晶温度和熔点随之下降     

含TLCP的PET共混纤维结构和性能

以热致性液晶共聚酯——聚对苯二甲酸乙二酯／对羟基苯甲酸（ＰＥＴ／ＰＨＢ）作为添加剂与ＰＥＴ共混纺丝，研究该ＰＥＴ／ＴＬＣＰ（热致性液晶高聚物）共混物的可纺性，并用ＤＳＣ、Ｘ光衍射、声速和应力－应变等方法对纤维的热性能、结晶和取向结构以及力学性能进行了表征。结果表明，ＴＬＣＰ质量含量为５％左右的ＰＥＴ共混物可纺性良好。ＴＬＣＰ对ＰＥＴ从熔体结晶具有阻止作用，共混初生纤维的玻璃化转变和冷结晶温度均因ＴＬＣＰ的存在而升高。ＴＬＣＰ质量含量为５％的共混物纤维结晶结构与纯ＰＥＴ纤维相似，但晶粒尺寸较小，且晶粒尺寸大小与共混物组成、喷丝头拉伸比和后拉伸比有关。ＴＬＣＰ含量增加，共混纤维取向度和模量增大，而强度下降，但后拉伸可使纤维强度有较大的提高。     

反应挤了HDPE／PET共混合金结构与性能研究

采用ＤＳＣ、ＷＡＸＤ、ＳＥＭ及ＴＧＡ等方法研究了ＨＤＰＥ／ＰＥＴ共混合金在增溶剂Ｅ／ＶＡＣ或Ｅ／ＡＡ作用下的结晶性、形态结构及热稳定性。结果表明，Ｅ／ＶＡＣ或Ｅ／ＡＡ的加入，使ＨＤＰＥ／ＰＥＴ体系中ＨＤＰＥ组分的熔融热焓降低，结晶度下降，但熔融峰位置和晶胞基本保持不变；从ＳＥＭ照片可以观察到Ｅ／ＶＡＣ、Ｅ／ＡＡ对共混体系具有一定的增容作用，Ｅ／ＡＡ和效果优于Ｅ／ＶＡＣ；共混体系的热稳定性随Ｅ／ＶＡ     

尼龙6/聚酯(PET)共混体系结晶相分离的研究

用差示扫描量热（ＤＳＣ）考察尼龙６／聚酯（ＰＥＴ）共混体系的结晶行为，表明是结晶相分离的。不同条件下，结晶相分离的过程和形成的结晶态不同，反映在热行为上，如熔融过程和相应特征参数值，便随着处理的条件、组成比等而改变。研究结果还表明，当尼龙６组分的质量分数Ｗ ＰＡ－６＜ ０．１ 时，它被ＰＥＴ 阻隔而不再结晶，因两者形成部分氢键，酯基对尼龙６ 结晶影响的结果，尼龙６／聚酯（ＰＥＴ）共混体系中尼龙６ 的熔融峰温，随组成比的变化呈现波浪形曲线。     

PET/离聚物共混体系的结晶行为研究

利用WAXD对聚对苯二甲酸乙二酯（PET）与高聚物Surlyn和Aclyn系列组成的共混体系的结晶行为进行了研究。结果表明，离聚物先于PET结晶，两者分别以各自的晶型出现，没有形成混晶、结晶时两相间有相互干扰;在所研究的范围内，PET／离聚物Na盐井混体系结晶度与纯PET的基本相同，PET／离聚物Zn盐井混体系的结晶度大于纯PET的结晶度，且离聚物含量的变化对其共混体系的结晶度的影响不明显。     

PC/PET/PE-g-MAM共混体系结晶性能的研究

采用PE-g-MAZn,PE-g-MANa离聚物增容PC/PET共混物,使共混体系相容性得到改善,同时由于离聚物自身成核作用的影响,使得PET的结晶性能发生变化。考察了离聚物接枝率及其用量变化对PC/PET/PE-g-MAM共混体系结晶性能及结晶形态的影响。结果表明,锌离聚物共混体系由于离聚物的成核作用较强,增容作用较弱,PET冷结晶温度随接枝率C增加出现一个极大值,晶粒增加,晶形及结晶度变化不大;钠离聚物共混体系由于离聚物增容作用较强,使共混物结晶形态及T_(gc),T_m,T_(mc)等呈现出不同于锌离聚物共混体系的特征。     

Crystalline and thermal behavior of poly(ethylene terephthalate)/polyphenoxy blends

Poly(ethylene terephthalate) (PET)/polyphenoxy blends were prepared by melt blending. Crystalline and thermal behaviors of PET/polyphenoxy blends were verified by use of DSC. The experiment results show that the initial temperature, peak temperature, and ending temperature of cold crystallization increase with increasing phenoxy content. On the contrary, the onset melting temperature, finishing melting temperature, and peak temperature in the first heating and the secondary heating processes decrease with increasing phenoxy content. The crystallization enthalpy and melting enthalpy, as well as the crystallization rate, decrease with increasing phenoxy content. Avrami exponents of the blends are slightly higher than that of pure PET and almost independent of phenoxy content. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 97: 878–885, 2005     

离聚物单体结构对PET非等温熔融结晶过程的影响

利用差示扫描量热仪、扫描电子显微镜、偏光显微镜等方法研究了不同单体结构的乙烯甲基丙烯酸离聚物(Surlyn)、乙烯基丙烯酸离聚物(Aclyn)及苯乙烯基丙烯酸离聚物(SAA)对聚对苯二甲酸乙二酯(PET)非等温熔融结晶过程的影响.结果表明,加入离聚物后PET的结晶速率常数K由0.35提高到1.00～2.37,提高结晶速率的能力为Aclyn>Surlyn>SAA.SAA中苯环的强位阻效应使其自聚集能力下降,Surlyn中羧酸钠基团上的甲基也产生了较大的位阻,降低了其自聚集能力,Aclyn分子链中没有多余基团干扰,其自聚集能力最强.     

Thermal and crystallization behavior of engineering polyblends. I. Glass reinforced polyphenylene sulfide with polyethylene terephthalate

The thermal and crystallization behavior of blends of glass fiber reinforced polyphenylene sulfide (PPS) with polyethylene terephthalate (PET) has been reported. The blends showed two overlapping melting peaks and two separate crystallization peaks. The heat of crystallization of PPS was found to decrease continuously with increasing PET content, whereas the heat of crystallization of PET was found to increase with increasing PPS content. This indicates that the degree of crystallinity of PPS is reduced whereas that of PET is increased as a result of blending. It is interesting to note that the combined heats of fusion of the blends were marginally higher than those calculated by proportional additivity rule in spite of the drop in the heat of crystallization of PPS. The temperature onset of crystallization of PET in the blends shifted to higher temperature whereas there was no significant change in the crystallization temperature of PPS. The increase in the temperature of crystallization of PET indicates enhanced nucleation. The isothermal crystallization studies of the component polymers revealed that both the component polymers crystallized at a relatively faster rate in the blend. The crystallization rate of PPS was found to increase significantly with increasing PET content. A significant increase in the rate of crystallization of PET was also observed in the blends. The acceleration of crystallization rate of PET in the blends was more pronounced as compared to that of PPS. The acceleration in the PET crystallization rate was attributed to the presence of glass fibers and crystallized PPS.     

高阻隔耐热PET/PEN饮料瓶的研制

用双螺杆挤出机研究了熔融挤出工艺、原料的选择及配比对聚对苯二甲酸乙二酯(PET)/聚对萘二甲酸乙二酯(PEN)共混物耐热性和阻隔性的影响,并利用差示扫描量热仪、核磁共振仪进行了性能表征。结果表明,PET与PET-PEN共聚酯容易熔融共混,即在无定形态相容;随挤出时间和温度的增加,PET/PEN共混物的冷结晶温度升高、熔点降低、阻隔性降低而玻璃化转变温度不变;随PET-PEN含量的增加,共混物的阻隔性和耐热性得到改善。用注-拉-吹工艺成型可得到PET/PEN共混物饮料瓶,其耐热性和对氧气的阻隔性比纯PET瓶高,且随PET-PEN含量的增加而提高。     

离聚物增容PET/TLCP共混物的研究及应用

研究了聚对苯二甲酸乙二酯(PET)/热致液晶聚合物(TLCP)原位复合共混物的流变行为、相容性、熔体结晶、耐磨性和微观结构.结果表明,TLCP的加入降低了共混物的扭矩,而增容剂离聚物的加入却提高了扭矩;少量TLCP的加入提高了共混物的结晶速率和结晶度,但是离聚物的加入反而降低了其结晶速率和结晶度;TLCP的加入能提高PET的耐磨性,离聚物的加入使PET/TLCP共混物的耐磨性进一步提高,离聚物的质量分数为5%时,PET/TLCP共混物的耐磨性最佳;TLCP在PET中能原位形成微纤结构,离聚物加入使微纤变小,分布更均匀;利用离聚物增容PET/TLCP所制备的工业丝编织成的造纸网,其使用寿命延长了20%,经济效益显著.     

PET/PLA共混物相容性和结晶性能的研究

研究了相容剂钛酸四丁酯[Ti(OBu)4]含量、聚乳酸(PLA)含量对聚对苯二甲酸乙二醇酯(PET)/PLA共混物相容性的影响,探讨了共混物的熔融和结晶行为,并对其结晶形貌进行了观察。结果表明,Ti(OBu)4含量为PLA的4%(质量分数,下同)时,PET/PLA共混物的相容性良好,但当PLA含量超过30%时,共混物出现相分离;PLA的加入使PET的结晶峰变窄,结晶速率增加,且结晶峰温度向高温方向移动;PLA的加入使PET的晶粒尺寸大幅减小,晶粒数目大幅增加,结晶更加完善。     

Reactive blending as a tool for obtaining poly(ethylene terephthalate)-based engineering materials with tailored properties

The structure and properties of blends of poly(ethylene terephthalate) (PET) with poly(trimethylene terephthalate) (PTT) at PTT concentration ≤30 wt.%, obtained with three different methods: from solution, melt extrusion, and direct spinning, are investigated. Relationships between the method of preparation and properties of blends are established. All blends show glass transition temperature at values determined by composition, and crystallization properties also dependent on the preparation method. Blends obtained from solution show separated melting of components. For blends obtained from the melt only PET crystallizes. The melting temperature decreases with the residence time of the melt at high temperatures, due to occurrence of ester exchange reactions. It is shown that reactive blending of PET/PTT mixtures occurring during preparation is a versatile route for obtainment of engineering materials with good mechanical properties, high crystallinity, glass transition temperature lower than that of PET, and melting temperature that may be controlled by the processing conditions.     

成核剂对PET非等温结晶动力学的影响

利用差示扫描量热仪(DSC)研究了滑石粉、苯甲酸钠和离子聚合物Surlyn对聚对苯二甲酸乙二醇酯(PET)非等温结晶行为的影响,并用Ozawa模型计算了非等温结晶动力学参数。结果表明:三种成核剂均是PET的良成核剂,其中苯甲酸钠的成核效果最为显著。与纯PET相比,三种成核剂的加入均使PET的结晶峰温度Tmc向高温偏移,过冷度(Tm-Tmc)明显降低,结晶速率常数K明显增大。纯PET和PET/成核剂共混体系的Ozawa指数n值介于1-4之间,均不为整数,且PET/成核剂共混体系的Ozawa指数n值小于纯PET的n值。