Sb/Ti复配催化半光聚酯可纺性研究

通过对五种不同Sb/Ti配比半光聚酯热性能研究发现,Sb/Ti复配聚酯熔融结晶温度Tmc高于锑和全钛,50/50温度最高,复配聚酯熔体成型性能弱于锑系;复配聚酯冷结晶峰温Tc高于锑系,后加工性能强于锑系。采用UDYDT路线的可纺性研究发现,复配聚酯原丝粘度降高于锑系聚酯,原丝强度高于锑系,DT丝的变化未表现出明显规律,纺丝温度296℃时,复配聚酯DT的强度可以达到与锑相当。     

钛系PET膜用聚酯回用性能研究

通过熔融挤出试验,系统研究了钛系PET膜用聚酯的回收性能,分别添加30%和100%回料聚酯,对钛系聚酯和锑系聚酯进行了反复挤出试验,结果表明,经多次挤出后,两种聚酯的性能如降解性能、结晶性能、端羧基及DEG含量的变化基本相当,钛系聚酯能够满足BOPET薄膜行业对聚酯原料回用的要求。     

新型钛系聚酯催化剂的催化性能研究

合成了一种应用型钛系聚酯(PET)催化剂TY,考察了在PET合成中催化剂TY对酯化时间、缩聚时间、产品性能等的影响;并与传统锑系催化剂三氧化二锑(Sb2O3)的性能进行了对比。结果表明:钛系催化剂TY不仅能缩短酯化时间和聚合时间,而且催化剂用量少、催化活性高;钛系催化剂TY用量为20~25μg/g时,催化活性最佳,催化剂TY 20~25μg/g的催化活性相当于Sb2O3350~400μg/g的催化活性;钛系催化剂合成的PET切片的特性黏数达0.683 d L/g,与锑系PET相比,色相L值提高达71.68,b值相差不大,端羧基含量及二甘醇含量降低,结晶行为及热性能相当;钛系催化剂TY适合无重金属聚酯的工业生产,工业应用性强。     

聚酯生产中Ti系催化剂开发的新进展

介绍了聚酯生产中Ti系催化剂的发展概况及新进展。对ZimmerAG,DuPontSA及SachtlebenChemie等公司开发的几种新型Ti系催化剂的开发目标、产品特点和应用情况进行了详细的说明。用新型Ti系催化剂合成的聚酯产品的色相和热稳定性得到了改善。随着聚酯工业的飞速发展,人们的环保和自身健康意识的提高,新型不含重金属的Ti系催化剂具有广阔的发展前景。     

双向同步拉伸工艺对PET聚酯薄膜性能的影响

为阐明双向同步拉伸工艺对聚酯薄膜性能的影响，利用聚对苯二甲酸乙二醇酯(PET)聚酯切片进行挤出铸片，并在不同拉伸温度、拉伸倍率和拉伸速度下进行双向同步拉伸制膜，研究了拉伸工艺对聚酯薄膜的拉伸行为、拉伸取向和结晶行为的影响。研究表明，随拉伸温度的提高，聚酯在拉伸过程中的拉伸应力减小，聚酯薄膜取向度降低，结晶度降低，但晶粒尺寸增加，薄膜雾度升高；随拉伸倍率的提高，拉伸应力增大，取向度升高，结晶度升高；随拉伸速度的提高，拉伸应力增大，取向度升高，结晶度升高，但晶粒尺寸变化不大，薄膜雾度相当。     

不同催化体系所得聚酯的等温结晶研究

用DSC法对三氧化二锑 (Sb2 O3)、氟钛酸钾 (K2 TiF6 )、钛酸四丁酯 (Ti(OC4 H9) 4)及乙二醇锑(S -2 4) 4种催化体系所得聚酯进行等温结晶研究 ,求得了结晶速率常数 (k)和Avrami指数 (n)。结果表明 ,锑系催化剂所得聚酯的结晶速度总体大于钛系催化剂所得聚酯 ,其中以Sb2 O3催化所得聚酯结晶速度最快 ,而Ti(OC4 H9) 4催化所得聚酯结晶速度最慢。DTA结果表明锑系催化剂所得聚酯冷结晶温度低于钛系催化剂所得聚酯 ,与结晶速度测试结果相一致。     

钛系聚酯预结晶性能探索

主要通过 DSC 对钛催化剂合成 PET 聚酯的预结晶性能进行了研究,以探索钛催化剂对聚酯预结晶性能的影响,并将其与锑系聚酯进行对比。结果表明,相比较锑系聚酯,钛催化剂合成 PET 聚酯切片内部残留结晶度低,冷结晶速度慢,同样工艺条件下钛系聚酯预结晶过程更容易粘结。     

纳米ZnO改性聚酯抗凝血性能研究

采用原位聚合方法制备了纳米ZnO/聚酯复合物,采用热压成膜和溶液法成膜两种方法将其制膜,利用动态凝血实验研究了纳米ZnO添加量及成膜方法对聚酯抗凝血性能的影响。结果表明,溶液法成膜的薄膜抗凝血性能优于热压法成膜。含有纳米ZnO的聚酯薄膜的抗凝血性能优于纯聚酯薄膜。随着纳米ZnO的加入量不断增加,聚酯薄膜的抗凝血性能先增加后减少。     

锑钛复合催化剂半消光聚酯等温结晶性能研究

采用锑(Sb)钛(Ti)复合催化剂,在300 L反应釜中合成半消光聚对苯二甲酸乙二醇酯(PET),通过差示扫描量热仪研究了不同Sb/Ti复合比的PET在195~210℃的等温结晶性能,并对PET的常规性能和热性能进行表征。结果表明:随着复合催化剂中Ti含量的增加,PET的等温结晶速度先快后慢,Ti系催化剂质量分数为50%时,PET等温结晶速度最快,Ti系催化剂质量分数为100%时,PET等温结晶速度最慢;当Ti系催化剂质量分数大于50%时,PET切片开始变黄;随着催化剂中Ti含量的增加,PET的冷结晶温度逐渐升高,熔融结晶温度先升高后降低,Ti系催化剂质量分数为50%时出现拐点。     

锑系催化剂聚酯的熔融及固相聚合

对锑系催化剂中常用的醋酸锑(Sb(AC)3)、三氧化二锑(Sb2O3)和乙二醇锑(Sb2(EG)3)进行熔融及固相聚合试验,结果表明,三氧化二锑的有效锑含量比醋酸锑及乙二醇锑低;乙二醇锑在固相聚合时的催化作用略低于醋酸锑和三氧化二锑;3种锑系催化剂相比,乙二醇锑催化剂聚酯固相聚合速度略慢,但特性粘数增幅最为平稳;220℃下的反应速率常数以醋酸锑制得的聚酯最大。     

聚酯类聚合物的共混及复合研究(续一)

综述了国内外近年来有关PET/PTT,PET/PBT,PET/PEN共混物的研究成果,包括共混物的转变温度,结晶性能,对链交换反应的影响因素,链交换反应的测定,以及共混后性能的改善情况。同时还介绍了PET/PTT复合改性纤维。     

Antimicrobial polyester

Two N‐halamine siloxane precursors, 5,5‐dimethyl‐3‐(3′‐triethoxysilylpropyl)hydantoin and 3‐(3′‐triethoxysilylpropyl)‐7,7,9,9‐tetramethyl‐1,3,8‐triazaspiro[4.5]decane‐2,4‐dione, have been synthesized and coated onto polyester fiber surfaces. The coated polyester was rendered biocidal after exposure to household bleach solution by converting the heterocyclic precursors to N‐halamine moieties. The thermal properties of these coated polyester samples were determined with differential scanning calorimetry. The chlorinated polyester swatches were challenged with Staphylococcus aureus (ATCC 6538) and Escherichia coli O157 : H7 (ATCC 43895) with contact times ranging from 1 to 30 min. The biocidal testing showed that the chlorinated samples inactivated S. aureus and E. coli O157 : H7 within 5 and 30 min of contact, respectively. Standard washing tests indicated that the chlorinated coated fibers were very resistant to loss of the coating through hydrolyses. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

Unsaturated polyester

Summary The polyesterification reaction between maleic anhydride and 1,5-pentanediol, using p-toluenesulphonic acid as catalyst, was carried out. The material was characterized spectroscopically and its molecular weight measured. Besides isomerization of maleate to fumarate, some sort of intramolecular ring closure between polymer end groups may be occurring, since there is little agreement between molecular weight measurements by end group analysis and gel permeation chromatography, and very weak absorption is observed for hydroxyl group.     

聚酯类聚合物的共混及复合研究(续二)

<正>2复合由于2种组分不同的收缩性,复合纤维具有自卷曲性能,而PET/PTT的热收缩差异,正是制备卷曲纤维所需要的,从而使它有着良好的应用价值。由于弹性纤维氨纶使用时需包覆其他纤维,而且不     

Biocidal polyester

Polyester fabrics were modified by covalently linking heterocyclic moieties, which could be halogenated, to the surfaces of the polyester fibers. Antimicrobial activity was introduced into the fabrics and fibers by exposure to a source of oxidative chlorine (chlorine bleach) that converted the heterocyclic precursor moieties into N‐chloramine functionalities. The antimicrobial activity could be repeatedly regenerated following its loss on challenge with suspensions of bacteria by further washing with aqueous oxidative chlorine. Biocidal polyester fabrics, fibers, and other materials potentially will be effective in reducing, or eliminating entirely, pathogenic microorganisms and odor‐causing micro‐organisms which directly contact them. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 177–182, 2002     

利用废聚酯制备对苯型不饱和聚酯树脂的研究

介绍了利用废聚酯制备对苯型不饱和聚酯树酯的方法。研究表明,该工艺简单合理,产品的耐腐蚀性、耐热性、机械性能和电性能优良     

Ferrocene-bound polyester resins

Seven ferrocene-bound polyester resins were prepared from fumaric acid and diethylene glycol in the presence of different ferrocene derivatives. To accomplish the incorporation of the organometallic moiety into the polyester resin chain, the cyclopentadienyl rings of ferrocene were substituted in the 1,1′ positions with reactive functional groups. The ferrocene derivatives used were: 1,1′-bis(1-hydroxyethyl) ferrocene 1 , 1,1′-ferrocene dicarboxylic acid 2 , and 1,1′-ferrocene diacetic acid 3 . The incorporation of an organometallic complex significantly increased the rate of the polyesterification process. In order of increasing rate enhancement, the effect was 2 < 3 < 1 . The effectiveness of ferrocene derivatives chemically incorporated into the polyester backbone during copolymerization with styrene was studied by monitoring the gel time, cure rate, and the resin properties. The efficiency of the copolymerization reaction of ferrocene-bound polymers with styrene decreased in the order 1 ≥ 3 > 2 . Mechanisms to account for these results are presented. Some of the strength related properties were also studied.     

热塑性聚酯弹性体

介绍了热塑性聚酯弹性体的合成、性能、加工和应用。TPEE是由聚对苯二甲酸丁二醇酯硬段和聚醚或脂肪族聚酯软段组成的嵌段共聚物，具有优异的力学性能、热性能和耐化学介质性能，可在-70～200℃使用，采用挤出、注射、吹塑等成型工艺进行加工。TPEE广泛用于汽车、制造、体育、薄膜、生物材料及高分子改性剂等领域。     

Curing reaction of saturated aliphatic polyester modified unsaturated polyester resins

Two series of unsaturated polyesters (UPE from isophthalic acid, fumaric acid, and propylene glycol) were prepared. In series-A resins, UPEs wee thickened with isocyanate-terminated saturated aliphatic polyestes, i.e., an isocyanate-terminated polycaprolactone diol (PE-di-OL), through reaction of the isocyanate group with the hydroxyl group of the UPE. In series-B resins, the UPEs were mixed with saturated aliphatic polyesters i.e., PE-di-OL. The curing reaction of these two series of UPEs with styrene was studied by using differential scanning calorimetry (DSC) and gel permeation chromatography (GPC). The DSC data show that for a fixed PE-di-OL molecular weight, the curing reaction rate of series-A UPE is faster than that of series-B UPE. The variation of microgel size during curing ws studied by GPC. These results revealed that microgel formation has a great effect on the kinetics of cure for the unsaturated polyester-styrene system. The curing of these two series of UPEs is found to strongly depend on the compatibility of the components in the curing system.