聚酯包装材料的特性及市场动向

聚酯包装材料(PET)主要包括非结晶聚酯、结晶聚酯和共聚性聚酯(PETG)3种。非结晶性聚酯透明度高,可作折叠式包装盒和气泡式包装盒;结晶聚酯的耐高温性能好,可作冷却食品的包装;PETG清澈透明,且坚韧性好,通常作医疗品包装。主要特性资料表明,PET消耗量的年增长率已跃居各种塑包装材料的前列。显然,这与PET的各种性能十分优良有关。首先,作为单层     

可降解热塑性聚酯研制成功

美国宝洁公司(P&G)最近开发成功可生物降解脂族聚酯Nodax,并计划于2004年开始工业化生产。Nodax是聚羟基键烷酸酯基产品,在有氧或无氧条件下均可降解,其良好的表面性能使其可用于印刷。该系列产品具有适当的机械性能和高互溶性,可与其     

共聚聚酯在包装领域的应用

1前言 通常PET树脂是由二元醇(乙二醇,EG)与二元酸(对苯二甲酸,TPA)缩聚而成线型均聚聚酯,而共聚聚酯是用醇或酸改性的聚酯,有PETG、PCTG和PCTA以及可降解的共聚聚酯.目前能够生产共聚聚酯的有美国Eastman(伊士曼)化学公司和韩国的SK公司.     

PBT／PET共聚酯及其纤维的热性能

本文利用差示扫描量热分析研究了ＰＢＴ／ＰＥＴ共聚酯及其纤维热性能与形态结构的关系。实验结果表明ＰＢＴ／ＰＥＴ共聚酯高温稳定性好，其结晶结构为ＰＢＴ／ＰＥＴ共晶结构，随ＰＢＴ含量增加，其熔融热增加，熔点下降，ＰＢＴ／ＰＥＴ共聚纤维的熔融热随拉伸倍数增加而增加，这表明纤维结晶度随拉伸倍数而增加，适宜于ＰＢＴ／ＰＥＴ共聚纤维的拉伸温度为８０℃。     

特种聚酯包装的更新

经过20多年的市场销售,“Carbopol”到了更新其形象的时候了。BF Goodrich 公司特种聚酯和化学品销售经理罗斯先生这样说,这种聚酯用作为制造人体防护品的增稠剂和肥皂、清洁剂的稠粘剂。     

我国双向拉伸聚酯膜缺口很大

我国双向拉伸聚酯膜缺口很大苏鹏福，余渡元，马力，孙宏ＴｈｅＡｐｐｌｉｃａｔｉｏｎＰｒｏｓｐｅｃｔｏｆＢＯＰＥＴ￥ＳｈｕＰｅｎｇｆｕ；ＹｕＤｕｙｕａｎ；ＭａＬｉ；ＳｕｎＨｏｎｇＡｂｓｔｒａｃｔ：ＩｎｔｒｏｄｕｃｔｉｎｇｔｈｅｆｅａｔｕｒｅＯｆＢＯＰＥＴ...     

聚脂--包装业的生力军

聚酯(Polyestrer)是以PET为代表的热塑性饱和聚酯的总称，包括PBT、PEN、PCT。及其共聚物。其中，PET是开发最早、产量最大、应用最广的聚酯产品。在包装领域，聚酯尤以包装容器的发展最引人注目，现在已有20％以上的PET用于包装材料，且呈逐年上升的趋     

新型高效包装用高分子材料——聚萘二甲酸乙二醇酯(PEN)

论述了聚萘二甲酸乙二醇酯（ＰＥＮ）的研究现状，合成方法，性能及ＰＥＮ／ＰＥＴ共混物（或共聚物）的有关情况。     

一种含能热塑性聚氨酯弹性体的性能

采用熔融二步法合成了以聚叠氮缩水甘油醚(GAP)为软段、以2,2-二叠氮甲基-1,3-丙二醇和二环已基甲烷二异氰酸酯(HMDI)为硬段的含能热塑性聚氨酯弹性体(ETPUE),通过红外光谱(FT-IR),差示扫描量热(DSC),动态力学性能测试(DMA)及力学性能测试对材料进行了结构和性能的表征.结果表明,所合成的不同硬...     

NMR analysis of poly(ethylene naphthalate) + poly(butylene terephthalate) blends

Melt blends of poly (butylene terephthalate) (PBT) and poly (ethylene naphthalate) (PEN) with 30, 40, 50, 60 and 70 wt% PEN were prepared using a single screw extruder and injection moulding machine. ¹³C and ¹H nuclear magnetic resonance (NMR) spectra were obtained with a Bruker DRX-400 instrument, on solutions prepared by dissolving samples of the homopolymers and each blend in deuterated trifluoroacetic acid + chloroform mixtures (1:1 by volume). The absence of new signals in ¹H and ¹³C spectra, that would be expected to result from transesterification reactions in the PBT + PEN blend system, provides convincing evidence that such reactions do not occur in these blends under the melt processing conditions that were used. In the light of published work on solid-state NMR studies of these and related blend systems, and our observations of partial miscibility with a very small domain size, together with substantial enhancement of the mechanical properties of PBT by blending with PEN, we conclude that the improvement in mechanical properties arises from molecular scale mixing of the homopolymers and strong but non-covalent bonding interactions over the very large interfacial area between the PBT-rich and PEN-rich phases.     

包装机械设计中的一种新方法--反求工程技术

介绍了反求工程的特点,重点分析了反求工程技术在包装机械开发中的应用,主要体现在系统方案设计、三维实体造型设计、快速原型制造等方面.     

立体电视技术的发展趋势

立体电视可以使电视画面再现立体视觉的真实效果，不仅可以用于现代的信息交流和文化活动，而且也可用于科学技术研究，工业设计、建设和生产以及医学和军事事业等等，显著提高其工作效率，因此已成为新的电视技术的发展方向和研究重点。本文阐述了近几年来国内外在这一方面的研究进展，包括常说的立体电视STV及全息电视HTV，和立本视觉及立体电视的基本原理。     

面向对象关系数据库在火箭弹新型包装设计中的应用

通过采用面向对象（ｏｂｊｅｘｔ－ｏｒｉｅｎｔｅｄ，简称Ｏ－Ｏ）的方法，以火箭弹新型包装数据库为例，阐述了采用面向对象方法进行数据库建模的步骤，归纳了将面向对象的分析结果转化为关系数据库模型的方法，建立了火箭弹包装数据库及共管理系统。     

高压电器设备包装材料优选研究

目的 实现高压电器设备包装材料的优选,提高包装材料选择的一致性和经济型,降低制造成本。方法 建立一种多目标材料选择优选模型,包括包装承载力、包装可靠性、包装成本、资源消耗、包装绿色性等5个优化目标,使用组合隶属度函数构建评价指标集,运用灰关联法与基于可能度排序算法的模糊层次分析法相结合的方法,实现材料优选。结果 候选材料的关联系数分别为0.745、0.606、0.669、0.749。结论 关联程度最大的包装材料为最终优选包装材料。     

多元合金超滤膜研制

主要研究了聚醚砜（PES）,聚砜（PSF）和磺化聚砜（SPSF）共混所形所的多元合金超滤膜的性能和膜的孔径分布特性,初步探讨了多元合金超滤膜的成孔机理,并对共混体系的组成及相容性与合金超滤膜性能问题的关系作了详细讨论,研究结果且明,共混可明显改善超滤膜的孔径分布和膜的孔结构,为制备高性能越滤膜提供一种有效途径。     

Crystal morphology,mechanical property and non-isothermal crystallization kinetics of poly(trimethylene terephthalate)/maleinized poly(ethylene-octene) copolymer binary blends

The crystal morphology, impact strength and nonisothermal crystallization kinetics of poly(trimethylene terephthalate)/maleinized poly(ethylene-octene) (PTT/PEO-MA) copolymer blends were studied by using the polarized optical microscopy, impact tester and differential scanning calorimetry (DSC). Avrami theory modified by Jeziorny, Ozawa and Mo theories were used to study the non-isothermal crystallization kinetics of the blends, respectively. The results suggest that these methods are suitable for analyzing the crystallization kinetics of the PTT/PEO-MA blends. The PEO-MA component, serving as a nucleation agent in blends, can increase the start crystallization temperatures and accelerate the crystallization rate of the blends. The crystal dimensions are predominantly three-dimensional growths, judged from the Avrami exponent n and the Ozawa exponent m, but the spherulites in blends are much smaller than those in pure PTT. The crystallization active energy suggests that the PEO-MA component can make the PTT component easy to crystallize in blends. The blend has the highest Izod impact strength as PEO-MA content is 3wt.%. Considering both the crystallization kinetic analyses results and the crystal morphology of the blends, the modified Avrami method is believed to be the most useful in reflecting the crystallization of the blends.     

Trends in radar absorbing materials technology

The research in the area of Radar Absorbing Materials (RAMs) has been actively pursued for at least four decades. Although resonant RAMs were originally designed by transmission line approach, and the broad band RAMs were obtained by multilayering, the quest for ultrawide band performance has led to novel approaches such as chirality and even exploring biochemical products. It is observed that radome materials are frequently used as RAMs. The understanding of the underlying principles of electromagnetic analysis and design, fabrication and the trends in RAMs reviewed in this paper could lead to indigenisation, and even pioneering next generation of RAM technology.