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首页> 外文期刊>Journal of Applied Polymer Science >Biobased Thermosetting Resins Composed of L-Lysine Methyl Ester and Bismaleimide
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Biobased Thermosetting Resins Composed of L-Lysine Methyl Ester and Bismaleimide

机译：L-赖氨酸甲酯和双马来酰亚胺组成的生物基热固性树脂

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摘要

Lysine methyl ester (LME), which was generated in situ by the reaction of lysine methyl ester dihydrochloride and triethylamine in dimethyl sulfoxide (DMSO), was prepolymerized with 4,4'-bismaleimidodiphenylmethane (BMI) at 80℃ for 2 h in DMSO. Then, the formed prepolymer was precipitated in water. The obtained LME/BMI prepolymers with molar ratios of 2:2, 2:3, and 2:4 were compression-molded at a final temperature of 230℃ for 2 h to produce cured lysine methyl ester/4,4'-bismaleimidodiphenylmethane resins (cLBs; cLB22, cLB23, and cLB24, respectively). Fourier transform infrared (FTIR) analyses revealed that the Michael addition reaction of amino groups to the C=C bonds of the maleimide group occurred in addition to the homopolymerization of the maleimide group. The glass-transition temperature (T_g) and 5% weight loss temperature (T_5) of the cured resin increased with increasing BMI feed content, and cLB24 showed the highest T_g (343℃) and T_5 (389℃). The flexural strengths (131-150 MPa) and moduli (3.0-3.6 GPa) of the cLBs were comparable to those of the conventionally cured resins of BMI and 4,4'-diaminodiphenylmethane. Field emission scanning electron microscopy analysis revealed that there was no phase separation for all of the cured resins. Although cLB23 and cLB24 were not biodegradable, cLB22 had a biodegradability of 8.5% after 30 days in an aerobic aqueous medium containing activated sludge.
机译：将赖氨酸甲酯二盐酸盐与三乙胺在二甲亚砜（DMSO）中反应原位生成的赖氨酸甲酯（LME）与4,4'-双马来酰亚胺二苯甲烷（BMI）在DMSO中于80℃预聚合2小时。然后，将形成的预聚物在水中沉淀。将获得的摩尔比为2：2、2：3和2：4的LME / BMI预聚物在最终温度230℃下压缩成型2小时，以生产固化的赖氨酸甲酯/ 4,4'-双马来酰亚胺二苯基甲烷树脂。 （分别为cLB; cLB22，cLB23和cLB24）。傅里叶变换红外（FTIR）分析表明，除了马来酰亚胺基团的均聚作用外，还发生了氨基与马来酰亚胺基团的C = C键的迈克尔加成反应。固化树脂的玻璃化转变温度（T_g）和5％失重温度（T_5）随着BMI进料量的增加而增加，而cLB24的最高T_g（343℃）和T_5（389℃）最高。 cLB的弯曲强度（131-150 MPa）和模量（3.0-3.6 GPa）与BMI和4,4'-二氨基二苯基甲烷的常规固化树脂相当。场发射扫描电子显微镜分析表明，所有固化树脂都没有相分离。尽管cLB23和cLB24不可生物降解，但在含有活性污泥的需氧水性介质中放置30天后，cLB22的生物降解率为8.5％。

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