高顺式HTPB对不饱和树脂的改性

针对不饱和聚酯脆性大的问题,以高顺式端羟基聚丁二烯(HTPB)为改性剂,采用溶液共缩聚法制得一系列不同HTPB质量分数的不饱和聚酯树脂(UPR),考察它们交联固化产物的力学性能和热性能.结果表明,无论常温或低温下,改性UPR的断裂伸长率、拉伸强度和冲击强度均高于纯UPR的对应值.当HTPB质量分数为5％ 时,改性UPR...     

活性端基液体橡胶增韧不饱和聚酯的研究

合成了丙烯酸酯封端和马来酸封端两种活性端基液体橡胶，并且用于不饱和聚酯的增韧。探讨了这两种液体橡胶的相对分子质量，加入量，端基种类，ＵＰ种类等因素对增韧的影响。通过ＳＥＭ、ＤＳＣ、抽提分析及力学性能测试研究了增韧ＵＰ的结构与性能的关系，并在此基础上探讨了活性端基液体橡胶增韧ＵＰ的机理。     

不饱和聚酯／聚氨酯互穿网络聚合物的力学性能和形态结构的表征

对由不饱和聚酯和聚氨酯形成的不同组成的互穿网络聚合物的缺口冲击强度,拉伸强度及弯曲强度等力学性能进行了分析,并由透射电子显微镜观察了这种材料的形态结构,结果表明,当聚氨酯用量为１０％～２０％（质量分数）时,聚合物形成较好的互穿网络结构,使材料具有较高的冲击强度及拉伸强度,但对弯曲强度影响不大。     

玄武岩纤维改性不饱和聚酯树脂的性能研究

本研究用未经处理的和酸化改性的玄武岩纤维分别对不饱和聚酯树脂进行填充改性,探究玄武岩纤维不同用量以及不同酸化时间对不饱和聚酯树脂的力学性能以及摩擦性能的影响。结果表明:未经改性的玄武岩纤维用量为2%时,不饱和聚酯基复合材料拉伸强度提高41%,冲击强度提高13%而摩擦系数降低58%,玻璃化转变温度提高50%,综合性能最优;而后将玄武岩纤维进行酸化,制备2%玄武岩纤维/不饱和聚酯复合材料,通过拉伸与冲击性能测试。结果表明酸化时间为1.5h时,复合材料性能最佳。     

超支化聚酯改性聚酯亚胺不饱和树脂

合成了一种带柔性链的芳醚型聚酯亚胺不饱和树脂(AEPUR),采用红外光谱技术对其结构进行了表征。研究了端羧基超支化聚酯(HTM-4)对AEPUR/环氧树脂E-44共混体系的弯曲性能、冲击性能和热性能的影响。结果表明,HTM-4能显著提高AEPUR/E44共混物的冲击强度和弯曲性能,表现出明显的增韧/增强作用,体系的热分解温度变化不大,残碳率明显增加。     

接枝改性环氧树脂/不饱和聚酯互穿聚合物网络的研究

研究了双酚A双烯丙基醚(ABE)对脂环族环氧树脂(CER)/三羟甲基丙烷三甲基丙烯酸酯(TMPTMA)分步互穿聚合物网络(SIPNs)的改性.利用扫描电子显微镜(SEM)考察了改性SIPNs形成的过程及最终固化物的微观结构,在此基础上研究了ABE用量对CER/TMPTMA SIPNs固化过程中的凝胶时间、最终固化物的力学性能及介电性能的影响.结果表明,ABE的加入没有改变CER/TMPTMA所形成SIPNs的结构,制得的改性SlPNs没有出现明显相分离现象.随着ABE用量的增加,改性SIPNs的冲击性能逐渐提高;当ABE用量为lO份时,改性SIPNs的弯曲性能最佳.ABE的加入还改善了改性SIPNs的介电性能,提高了改性SIPNs的电气强度.当ABE用量为20份时,改性SIPNs的电气强度最高.     

超支化不饱和树脂改性不饱和聚酯涂料的制备及性能研究

为了进一步提高不饱和聚酯涂料的固化能力和涂膜的综合性能,用三羟甲基丙烷二烯丙基醚与异佛尔酮二异氰酸酯加成物对端羟基超支化聚酯进行改性制得超支化的不饱和树脂,再用所得的超支化不饱和树脂对线性不饱和聚酯进行改性,用傅里叶变换红外(FT-IR)、核磁共振(1H-NMR)、凝胶渗透色谱(GPC)、扫描电子显微镜(SEM)、热重分析(TG)等对产物进行表征与分析,结果表明,当超支化不饱和树脂添加量为30%时,所得涂料具有最优异的综合性能,表干时间39 min,铅笔硬度2H,柔韧性3 mm,耐冲击性45 cm,拉伸强度10.15 MPa,断裂伸长率13.06%,耐热性最好。     

LPIB-g-GMA的制备及其对不饱和聚酯性能的影响

采用甲基丙烯酸缩水甘油酯(GMA)为液体聚异丁烯(LPIB)的接枝物,并用苯乙烯为其共聚单体,利用溶剂热法合成了甲基丙烯酸缩水甘油酯接枝液体聚异丁烯( LPIB-g-GMA).研究了LPIB-g-GMA对不饱和聚酯树脂( UPR)力学性能及其它性能的影响.结果表明,随着LPIB-g-GMA含量的增加,UPR/LPIB-...     

聚合物微凝胶的制备及其在不饱和聚酯改性中的应用

以苯乙烯和丙烯酸丁酯为单体,二乙烯基苯（ＤＶＢ）为交联剂利用乳液聚合法制备出聚合物微凝胶并研究了ＤＶＢ及乳化剂用量对聚合反应的影响,将所得到的微凝胶用于增进不饱和聚酯（ＵＰ）的流变性。试验证明聚合物微凝胶对提高ＵＰ的触变指数具有良好的效果。     

聚酯改性不饱和聚酯树脂的合成研究

本文研究了由聚酯改性合成不饱和聚酯树脂的反应机理和工艺条件,讨论了改性树脂反应活性与不饱和酸结构之间的关系,解释了顺、反式双键结构对改性树脂固化放热特性和反应活性不同的原因.     

Modification of unsaturated polyester resin with bismaleimide

The modification of a commercially available unsaturated polyester resin with 4,4′‐bismaleimidodiphenylmethane is presented. The properties of the modified resins were compared with those of the nonmodified resin, and the resins were characterized in the noncured state and after curing. The results indicate that the addition of bismaleimide to unsaturated polyester resin not only improves its properties but also accelerates the curing reactions. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 2003–2007, 2001     

Modification of unsaturated polyester resin by polyurethane prepolymers

Unsaturated polyester resins (UPRs) are extensively used by the fiber‐reinforced plastic (FRPs) industry. These resins have the disadvantages of brittleness and poor resistance to crack propagation. In this study, UPRs were chemically modified by reactive blending with polyurethane prepolymers having terminal isocyanate groups. Hybrid networks were formed by copolymerisation of unsaturated polyesters with styrene and simultaneous reaction between terminal hydroxyl groups of unsaturated polyester and isocyanate groups of polyurethane prepolymer. The prepolymers were based on toluene diisocyanate (TDI) and each of hydroxy‐terminated natural rubber (HTNR), hydroxy‐terminated polybutadiene (HTPB), polyethylene glycol (PEG), and castor oil. Properties like tensile strength, toughness, impact resistance, and elongation‐at‐break of the modified UPRs show considerable improvement by this modification. The thermal stability of the copolymer is also marginally better. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 449–456, 2006     

Grafting of natural rubber for preparation of natural rubber/unsaturated polyester resin miscible blends

Graft copolymers of natural rubber and polystyrene were synthesized by free‐radical grafting of styrene monomer onto natural rubber in latex form. The obtained graft copolymers and unsaturated polyester (UPE) resin were mixed and cast at room temperature using methyl ethyl ketone peroxide as an initiator and Co‐octoate as an accelerator. The samples prepared from ungrafted natural rubbers exhibited the aggregation of the rubber component, whereas the samples prepared from grafted natural rubbers showed good dispersion of the rubber component in a glassy matrix of UPE resin. It was found that the amount of polystyrene grafted onto natural rubber and the graft copolymer content in polymer blend significantly affect the mechanical properties of the blend samples. An increase in the amount of hard and brittle polystyrene in glassy matrix of UPE resin overshadowed the impact‐absorbing ability of the rubber component, causing the impact strength of the blend samples to be lower than that of pure UPE resin. On the other hand, an increase in easily elongated uncrosslinked rubber molecules, as the graft copolymer content in blend samples increased, resulted in a decrease in their flexural strength. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 1496–1503, 2004     

不饱和聚酯型人造大理石的力学性能

简述了不饱和聚酯(UPR)型人造大理石的制备工艺。研究了质量比为4∶1的Al(OH)3/Ca(OH)2复合填料用量对不饱和聚酯型人造大理石力学性能的影响,对制得的人造大理石的耐腐蚀性进行了测试,采用光学显微镜观察了试样腐蚀前后的表面形貌。结果表明,在复合填料与UPR质量比为1.86∶1时,弯曲强度、压缩强度达到最大,分别为55.88 MPa和96.04 MPa。甲苯对人造石的腐蚀作用最大,氢氧化钠次之,硫酸腐蚀作用较小,腐蚀介质主要对不饱和树脂聚合物产生腐蚀,从而导致人造石力学性能降低。     

2步法合成双环戊二烯型不饱和聚酯树脂

采用2步法合成了原子灰用双环戊二烯(DCPD)型不饱和聚酯树脂,研究了原料用量对树脂性能影响,当n(顺酐)∶n(工业DCPD)∶n(精制DCPD)∶n(二元醇)=2.0∶0.7∶0.5∶1.75时,树脂性能稳定,原子灰综合性能如气干性、耐热性、打磨性、刮涂性、柔韧性等良好。     

不饱和聚酯树脂改性研究进展

综述了不饱和聚酯树脂(UPR)改性的研究进展。介绍了收缩率控制机理,低收缩研究发展的4个阶段,低收缩剂LSA的典型代表——聚苯乙烯(PS),聚甲基丙烯酸甲酯(PMMA),聚醋酸乙烯(PVAc),PVAc-PS共聚物。讨论了UPR增韧改性方法,提高分子主链对称性,在分子结构中引入长链醇与长链酸,长链醇包括一缩二乙二醇、二缩三乙二醇及聚乙二醇;长链二元酸如己二酸等。此外还可加入热塑性弹性体,如液体橡胶、液体聚氨酯等以形成互穿网络结构增韧UPR。论述了提高UPR阻燃性的2种途径,即选用本质阻燃性树脂和向UPR中添加阻燃剂。介绍了含卤有机阻燃剂、无机阻燃剂、主链或主链与侧链均含磷的阻燃剂和赋予阻燃性的影响因素。介绍了部分采用可降解的植物纤维——竹纤维制备的UP复合材料和木粉改善UPR的性能。这些方法使不饱和聚酯树脂在低收缩性能、力学性能、阻燃性能等方面得到了改善,扩展了其应用范围。     

不饱和聚酯树脂产品质量存在的问题及其建议

概述了不饱和聚酯树脂的分类及应用;提出了国内不饱和聚酯树脂产品质量存在的问题及其建议.     

Utilization of flyash as filler for unsaturated polyester resin

Flyash is an inexpensive material that can reduce the overall cost of the composite if used as a filler for unsaturated polyester resin (PR). Flyash-filled unsaturated polyester resin (FPR) was cast into sheets. The tensile strength, flexural strength, and flexural modulus were determined. Calcium carbonate-filled polyester resin (CPR) and PR were also cast into sheets. The above-mentioned properties were determined and a comparison was made. The filler concentration was varied from 0 to 15 wt %. It was found that FPR was inferior to CPR and PR composites with respect to tensile and flexural strengths. But FPR was found to have a higher flexural modulus than those of CPR and PR. FPR with 10% flyash was found to have poor acid and solvent (benzene) resistances and good saltwater, alkali, weathering, and freeze–thaw resistances as seen from the mechanical properties. The possible ways of improving the strength of FPR are discussed. © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 69: 1385–1391, 1998     

豆油制备不饱和聚酯树脂性能研究

以可再生资源豆油、丙三醇为原料醇解制备了单甘酯,将其作为二元醇,部分取代丙二醇与酸酐反应制得不饱和聚酯树脂(UP)。采用DSC,DMA以及力学性能测试等手段研究了单甘酯含量对豆油不饱和聚酯树脂性能的影响。结果表明,随着单甘酯含量的增加,豆油不饱和聚酯树脂的固化放热峰值降低、固化收缩率减小;存储模量和玻璃化转变温度都有一定程度降低,弯曲强度和拉伸强度也逐渐下降;冲击强度和拉伸断裂伸长率增高(单甘酯质量分数为40%时可分别达到102.074 kJ/m2和27.69%)。该方法制备的UP树脂成本低廉,柔韧性好,可满足一般的使用要求。