本文關(guān)鍵詞：石墨烯改性氰酸酯基復(fù)合材料及其抗電子質(zhì)子輻照研究　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 氰酸酯基復(fù)合材料 石墨烯 電子質(zhì)子輻照 損傷機(jī)理

【摘要】：氰酸酯樹(shù)脂在航空航天領(lǐng)域得到越來(lái)越廣泛的應(yīng)用,然而其韌性較差的缺點(diǎn)限制了它的發(fā)展。本文采用石墨烯對(duì)氰酸酯進(jìn)行增韌改性,來(lái)制備適合航天器使用的復(fù)合材料,為航天器結(jié)構(gòu)材料的選材提供實(shí)驗(yàn)和理論依據(jù)。研究了石墨烯改性對(duì)氰酸酯澆鑄體和碳纖維/氰酸酯復(fù)合材料的力學(xué)、耐熱性能、尺寸穩(wěn)定性等性能的影響規(guī)律,研究結(jié)果表明,石墨烯改性可以提高氰酸酯澆鑄體和碳纖維/氰酸酯復(fù)合材料的力學(xué)性能,當(dāng)石墨烯添加含量為0.6%時(shí),氰酸酯澆鑄體的拉伸、彎曲、壓縮強(qiáng)度分別提高了18%、12%、34%;碳纖維/氰酸酯復(fù)合材料的拉伸、彎曲、層間強(qiáng)度分別提高了17%、10%、15%。對(duì)石墨烯改性后氰酸酯澆鑄體的DSC測(cè)試表明,改性后其玻璃化轉(zhuǎn)變溫度有所提高,氰酸酯的耐高溫性能得到增強(qiáng);對(duì)石墨烯改性后的氰酸酯澆鑄體和碳纖維/氰酸酯復(fù)合材料熱膨脹系數(shù)的測(cè)試結(jié)果表明,兩種材料的熱膨脹系數(shù)均有降低,其尺寸穩(wěn)定性得以提高。利用空間環(huán)境效應(yīng)模擬器對(duì)所制備的材料進(jìn)行了真空條件下電子質(zhì)子輻照實(shí)驗(yàn)。結(jié)果表明,石墨烯增強(qiáng)了氰酸酯樹(shù)脂的抗電子質(zhì)子輻照性能,輻照對(duì)復(fù)合材料造成的損傷效應(yīng)主要發(fā)生在基體,其損傷結(jié)果是交聯(lián)效應(yīng)、降解效應(yīng)及放電燒蝕效應(yīng)共同作用的,在電子、質(zhì)子先后順序的綜合輻照下,輻照注量的閾值為1.0×1016e(4.0×1015p)/cm2,當(dāng)輻照注量低于閾值時(shí),CE樹(shù)脂分子鏈的交聯(lián)效應(yīng)為主,M40/GE-CE復(fù)合材料力學(xué)性能隨著輻照注量的增加而增加,輻照注量高于閾值時(shí),CE體系的降解效應(yīng)為主,M40/GE-CE復(fù)合材料的界面受到輕微損傷,其拉伸、彎曲、剪切性能都有不同程度的下降。隨著輻照注量的增加,發(fā)生在樹(shù)脂基體的放電燒蝕現(xiàn)象逐漸增多;對(duì)改性前后氰酸酯的電子順磁共振分析表明,氰酸酯內(nèi)自由基的含量隨著輻照注量的增加而呈線性增加,改性氰酸酯內(nèi)自由基的含量隨著輻照注量的增加呈非線性增長(zhǎng),其增長(zhǎng)速率逐漸趨于零。改性前后氰酸酯澆鑄體的表面粗糙度隨輻照注量的增加呈先降低后增加的趨勢(shì),其分子結(jié)構(gòu)中官能團(tuán)的吸收峰強(qiáng)度呈先增加后降低的趨勢(shì)。
[Abstract]:Cyanate ester resin is more and more widely used in aerospace field, but its poor toughness limits its development. In this paper, graphene was used to toughen cyanate ester. The mechanical properties of graphene modified p-cyanate casting and carbon fiber / cyanate composite were studied. The results show that the modification of graphene can improve the mechanical properties of cyanate ester casting and carbon fiber / cyanate ester composites. When the content of graphene was 0.6, the tensile, flexural and compressive strength of cyanate casting increased by 18%. The tensile, flexural and interlaminar strength of carbon fiber / cyanate composite increased by 17% and 10% respectively. The DSC test of cyanate casting after graphene modification showed that the tensile strength of carbon fiber / cyanate composite was increased by 17%. After modification, the glass transition temperature was improved, and the high temperature resistance of cyanate ester was enhanced. The thermal expansion coefficient of graphene modified cyanate casting and carbon fiber / cyanate composite was measured. The results showed that the thermal expansion coefficient of the two materials decreased. The dimensional stability was improved. The electron proton irradiation experiments were carried out under vacuum condition using the space environment effect simulator. Graphene enhanced the anti-electron proton radiation performance of cyanate ester resin. The damage effect caused by irradiation on composite mainly occurred in matrix and the damage result was crosslinking effect. Under the combined irradiation of electron and proton sequence, the threshold of irradiation flux is 1.0 脳 10 ~ (16) E ~ (-1) ~ (4.0) 脳 10 ~ (15) p ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1) ~ (-1). When the irradiation flux is lower than the threshold value, the crosslinking effect of M40 / GE-CE composite increases with the increase of irradiation flux, and the irradiation flux is higher than the threshold value. The degradation effect of CE system is mainly due to the slight damage to the interface of M40 / GE-CE composites. The tensile, bending and shear properties of M40 / GE-CE composites decrease in varying degrees. The phenomenon of discharge ablation in resin matrix increased gradually. The electron paramagnetic resonance analysis of cyanate ester before and after modification showed that the free radical content in cyanate ester linearly increased with the increase of irradiation flux. The content of free radical in modified cyanate ester increased non-linear with the increase of irradiation flux. The surface roughness of cyanate casting before and after modification decreased first and then increased with the increase of irradiation flux. The absorption peak strength of the functional group in its molecular structure increased first and then decreased.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ317;TB332

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