共查询到18条相似文献,搜索用时 31 毫秒
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通过合成一种新的含二酰胺键和砜基的单体,将其与硫化钠进行常压溶液缩聚,合成出了间位聚芳硫醚砜酰胺酰胺(m-PPSSAA),其黏度达0.46g/dL,并通过红外、核磁(NMR)、紫外(UV)证实了其化学结构。用差示扫描量热分析(DSC)、热重分析(TGA)等手段对m-PPSSAA的热性能进行了表征,结果表明聚合物具有优良的热性能,通过溶解性试验表明m-PPSSAA能溶解于N,N-二甲基甲酰胺(DMF)、二甲亚砜(DMSO)、N-甲基吡咯烷酮(NMP)等溶剂,比聚苯硫醚(PPS)的溶解性好。 相似文献
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聚苯硫醚酰胺的合成与表征 总被引:7,自引:1,他引:6
用4-氯苯甲酰4′-氯苯胺和硫化钠为原料在常压下合成了聚苯硫醚酰胺,并对其进行了表征。结果表明所合成的产物为结晶性聚合物,并且有较高的热稳定性。 相似文献
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硫脲法合成聚苯硫醚酰胺及其表征 总被引:3,自引:0,他引:3
用硫脲为硫源,与4-氟-N-(4′-氯亚苯基)苯甲酰胺在极性有机溶剂中常压缩聚,成功了合成了聚苯硫醚酰胺,用元素分析,红外线光谱分析,核磁共振谱分析及X衍射等现代分析手段对其结构进行了表征。结果表明,用硫脲代替硫代钠或硫磺硫源作为聚苯硫脲醚酰胺与后者有几乎相同的结构,还用TGA,DSC等方法对所得聚合物的热性能作了初步研究。 相似文献
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以丙交酯(LAD)和哌嗪(PPZ)为原料通过熔融反应制得酰胺二醇单体(HO-LA-PPZ-LA-OH),再经N,N’-羰基二咪唑(CDI)偶联聚合生成一种新型的含乳酸聚合物——聚碳酸酯酰胺(CDI-LA-PPZ-LA)。采用红外光谱、核磁共振和差示扫描量热分析等对材料进行了表征。结果表明,HO-LA-PPZ-LA-OH和CDI-LA-PPZ-LA已被成功合成;聚合物的玻璃化转变起始温度为84.3℃,数均相对分子质量为4328。后续的研究需要进一步提高CDI-LA-PPZ-LA的相对分子质量,以拓展其作为组织修复材料的应用。 相似文献
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以自制的4,4′-二氟二苯酰胺和4,4′-二氯二苯砜及精制工业硫化钠为反应单体,在N-甲基吡咯烷酮中采用分批投料、逐步聚合的方式,进行常压缩聚,合成了线型较高分子量的新型聚芳硫醚砜酰胺共聚物(PA SS/A),在较优的反应的条件下,制得了特性黏数在0.25 dL/g~0.40 dL/g的共聚物。用红外和核磁对聚合物进行了结构表征,用TG、DSC等手段对聚合物热性能进行了测试,用XRD对聚集态结构进行了表征。结果表明,共聚物具有优良的耐热性和局部有序结构;且发现该聚合物的玻璃化温度和热稳定性随着酰胺含量的增加而略微降低。 相似文献
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以不同长度的长链醚胺与对氟苯甲酰氯为原料,通过界面亲电取代反应合成了3种双氟取代的长链醚胺,并采用常压溶液缩聚法,将其与联苯二酚、4,4’-二氯二苯砜及2-(双(4-羟基苯基)甲基)苯甲酸通过共聚的方式,制备了一系列新型不同脂肪链段长度及含量的聚芳醚酰胺树脂。通过红外光谱和核磁共振氢谱表征了单体及聚合物的化学结构;差示扫描量热分析、动态力学热分析和热重分析结果表明所制备的聚合物具有优异的热性能,并且能够通过改变分子链段中软段的种类及共聚比例,对热性能进行一定程度的调整(玻璃化转变温度在83.9~215.3℃之间,热分解温度在361.3~426.3℃之间);通过拉伸实验对其拉伸强度和断裂伸长率进行了表征;摩擦学性能测试表明该系列聚合物摩擦系数为0.50~0.60。该类聚合物具有优良的热性能、力学性能及摩擦性能,可望作为特殊树脂材料用于高温、耐磨苛刻环境。 相似文献
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以丁二酸、丁二醇、1,6-己二胺为原料,二丁基二月桂酸锡为催化剂,甲苯二异氰酸酯(TDI)为扩链剂,通过熔融共聚,合成了Mw为40~65 k的聚丁二酸-丁二醇-1,6-己二胺共聚物,并采用压延成膜法制得聚酯酰胺薄膜。研究了1,6-己二胺含量对聚酯酰胺的热性能、结晶性能、降解性能和流变性能的影响。结果表明,合成了聚酯酰胺,其熔点达到100.97℃,热分解温度为317.85℃;随着1,6-己二胺添加量增加,聚酯酰胺的拉伸强度不断变大,断裂伸长率略有下降;1,6-己二胺的加入并未改变聚酯酰胺的晶型,但降低了其结晶度;1,6-己二胺的加入提高了聚酯酰胺降解性能,而且改善了其流变性能,这有利于聚酯酰胺的成型加工和应用。 相似文献
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聚芳醚酰胺和聚芳醚砜酰胺的研究 总被引:6,自引:1,他引:5
研究了醚酰胺和砜酰胺作为第三单体对聚对苯二甲酰对苯二胺(PPTA)的改性。结果表明,在PPTA分子中引入一定量的第三单体,并不会降低PPTA纤维的一些优良性能,相反,改性的PPTA在溶解性、耐燃性、韧性等方面得到改善。 相似文献
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The development of the reactions and early-age properties of a system consisting of calcium sulfate hemihydrate and acrylamide monomer was studied. The hydration of the hemi-hydrate and the polymerization of the acrylamide were determined at various time intervals, and the expansion and rise in temperature were continuously recorded. Setting times and flow were determined using standard test methods. It was shown that acrylamide and hemi-hydrate could react simultaneously to form gypsum and polyacrylamide composite in which the reactions to form both components advanced almost until completion, for mixes containing up to 10% acrylamide. Increase in the content of acrylamide improved the flow properties of the mix, but delayed the setting. At contents of 2% acrylamide, the hemi-hydrate reaction occurred prior to the polymerization process. Above 6% acrylamide, the polymerization reaction preceded the hemi-hydrate reaction. This sequence of reactions can account for the observations that above 6% acrylamide two peaks in the heat liberation curves could be detected as well as that expansion was smaller at the higher acrylamide content, due probably to separation between gypsum crystals forming when the polymer is already present. 相似文献
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Gels obtained through the sol-gel procedure by mixing an alkoxide with a carboxylic acid emit intense intrinsic photoluminescence when the alkoxide contains an amine or amide group. However, also simple polyether chains with two end amino groups but no alkoxysilane groups gel by interaction with carboxylic acids and also emit photoluminescence. Luminescence emission in these gels could be justified by a model similar to the emission of Green Fluorescent Protein. According to this model, amide groups, abundant in these gels, go through multiple reactions with other amide or amino groups so that they could yield conjugated species that are capable to emit photoluminescence. This model could open the possibility to synthesize a great variety of photoluminescent species based on amine-carboxylate interactions. 相似文献
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采用旋涂法将石墨烯和聚砜酰胺(PSA)制成不同石墨烯质量分数的石墨烯/PSA复合薄膜,利用光学显微镜、傅里叶变换红外光谱、表面电阻测试、热失重分析和紫外光谱表征和分析石墨烯/PSA复合薄膜的化学组成、大分子结构、热性能、导电性能、力学性能和抗紫外性能。结果表明:少量的石墨烯可均匀分散于PSA基体中,其加入基本没有改变PSA的化学结构;石墨烯二维纳米材料可作为异相成核剂,有助于提高复合薄膜的结晶度,其加入使复合薄膜的力学性能和热性能也有所提高;当石墨烯质量分数为0.1%时,石墨烯/PSA复合薄膜的表面比电阻由纯PSA薄膜的3.10×1012Ω迅速降至1.40×106Ω,随着石墨烯质量分数的增大,石墨烯/PSA复合薄膜的导电性能随之提高。石墨烯对加强复合薄膜对紫外光的吸收和散射、提高其抗紫外线性能有重要作用。 相似文献
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Phase segregation in poly(ether block amide) copolymer has been studied by thermally stimulated depolarization (TSD). Well-defined, complex and partial phase segregation were observed depending on the molecular mass of each segment of the copolymer. A new glass transition peak appeared were broadened. Soft-segment component poly(tetramethylene glycol) (PTMG), with a lower molecular mass, was found to be completely amorphous. No additional Maxwell-Wagner-Sillers (MWS) effect peak at the phase boundaries was detected. 相似文献