排序方式: 共有14条查询结果,搜索用时 15 毫秒
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以溶液聚合法合成了以1,5-二-β-羟乙醚基蒽醌为染料单体的新型共取酯染料,通过紫外-可见、核磁共振、热重等方法对聚合物性能进行表征,将其作为色母在毛细管流变仪上对聚酯纤维进行共混染色,并测定其光宾度。 相似文献
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本文利用DSC研究了热致液晶性序列嵌段共聚酯在不同升温速率时的多重熔融转变,和不同冷却速率对结晶与熔融过程的影响。发现T_(kn)和T_(ni)与热历史、升温速率及成形条件均无关,T_(kn)=425.86K,T_(nt)=480.60K;而T_(in)与T_(nk)随冷却速率增大而降低。 相似文献
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用Instron3211型毛细管流变仪研究了以对羟基苯甲酸(PHB)、对苯二甲酸(TPA)和双酚A(BPA)为单体合成的共聚芳酯液晶熔体的流变性能。结果表明,切变速率、熔体温度及PHB链节含量对切粘度和结构粘度有很大的影响。切变速率在10~103/S、温度295~330℃范围内,共聚酯粘流活化能△Eη为74.5~205.1(kJ/mol)。液晶熔体在剪切流中存在屈服应力τo,随温度升高τo值降低。在低温、低切变速率下,共聚酯熔体的弹性很小,甚至呈现挤出收缩现象。 相似文献
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采用合成的四元液晶共聚酯BP-LCP和BPM-LCP分别不同的配比与聚碳酸酯、聚对苯二甲酸丁二酯进行原位复合,对原位合物的流变性能和微观结构形态进行研究,并且探讨了液晶共聚酯与基体的相匹配关系,对原位复合的效果作了评价。 相似文献
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采用溶液共混制备耻不同比例的热致液晶共聚酯/含酚酞侧基聚芳醚砜共混物。利用锥板流变仪对共混体系的熔体流变性能进行了初步研究,测定了熔体粘度-温度、粘度-剪切速度的关系,结果表明该液晶聚合物能明显降低聚芳醚砜的熔体粘度。 相似文献
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液晶高分子材料具有相当高的强度和模量,被誉为当代超级工程塑料.以对羟基苯甲酸甲酯、1,4-丁二醇为主要原料,经熔融酯交换合成双-对羟基苯甲酸丁二醇酯(BBHB);以四氯乙烷为溶剂,采用溶液缩聚法将过量的BBHB与对苯二甲酰氯(TPC)合成端基为BBHB的齐聚物(PHBT);以对苯二甲酸二甲酯与乙二醇为原料,经熔融酯交换合成对苯二甲酸双β-羟乙酯(BHET),然后采用溶液缩聚法将BHET与少量的TPC合成端基为TPC的齐聚物(PTET);最后以PHBT与PTET为原料,以四氯乙烷为溶剂,采用溶液缩聚法合成目标共聚酯(PET-HBT)。研究了共聚酯的双折射现象及热行为;用偏光显微镜观察了试共聚酯的织态结构并用FTIR表征了共聚酯的微观结构. 相似文献
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Xiaoqing Liu Chuncheng Li Dong Zhang Yaonan Xiao 《Macromolecular chemistry and physics.》2006,207(7):694-700
Summary: A series of high molecular weight poly(butylene succinate) copolyester containing rigid imide units were synthesized in this paper. The chemical structure and composition of the copolyesters were determined by 1H NMR spectroscopy and Fourier transform infrared spectroscopy (FT‐IR). Gel permeation chromatography (GPC) was employed to determine the molecular weight and molecular weight distribution. The differential scanning calorimetry (DSC) technique showed that the melting temperature (Tm) of the copolyester decreased slightly with the increment in trimellitic imide unit content. When the imide unit content was increased to 6.3 mol‐%, it had an elongation at break of 510% (83% higher than that of PBS) and a tensile strength of 37 MPa (7% higher than that of PBS). The changes in mechanical properties of the copolyester might be owed to the compositive effects of spherulitic morphology and imide units.
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Martin Koller Miguel Miranda de Sousa Dias Alejandra Rodríguez-Contreras Matja? Kunaver Ema ?agar Andrej Kr?an Gerhart Braunegg 《Materials》2015,8(9):6543-6557
Liquefied wood (LW) prepared in a microwave process was applied as a novel; inexpensive precursor feedstock for incorporation of (R)-3-hydroxyvalerate (3HV) into polyhydroxyalkanoate (PHA) biopolyesters in order to improve the biopolyester’s material quality; Cupriavidus necator was applied as microbial production strain. For proof of concept, pre-experiments were carried out on a shake flask scale using different mixtures of glucose and LW as carbon source. The results indicate that LW definitely acts as a 3HV precursor, but, at the same time, displays toxic effects on C. necator at concentrations exceeding 10 g/L. Based on these findings, PHA biosynthesis under controlled conditions was performed using a fed-batch feeding regime on a bioreactor scale. As major outcome, a poly(3HB-co-0.8%-3HV) copolyester was obtained displaying a desired high molar mass of Mw = 5.39 × 105 g/mol at low molar-mass dispersity (ĐM of 1.53), a degree of crystallinity (Xc) of 62.1%, and melting temperature Tm (176.3 °C) slightly lower than values reported for poly([R]-3-hydroxybutyrate) (PHB) homopolyester produced by C. necator; thus, the produced biopolyester is expected to be more suitable for polymer processing purposes. 相似文献