本文關(guān)鍵詞：EPDM基復(fù)合材料的sub-Rouse結(jié)構(gòu)轉(zhuǎn)變及機(jī)理研究　出處：《中國科學(xué)技術(shù)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 鏈段運動 sub-Rouse轉(zhuǎn)變 EPDM 溫度內(nèi)耗譜 頻率內(nèi)耗譜 力學(xué)性能

【摘要】：三元乙丙橡膠具有其耐臭氧、耐熱、耐候、耐老化性能優(yōu)異。在實際應(yīng)用過程中,三元乙丙橡膠通常不能自己加工了單獨使用,為了改善橡膠的機(jī)械及功能特性,通常需要填充各種無機(jī)粒子。盡管用填充無機(jī)納米顆粒進(jìn)行改善,但是會影響聚合物材料的力學(xué)性能和使用領(lǐng)域。本文主要討論三元乙丙橡膠的鏈段松弛行為,聚合物性能的改善取決于橡膠硫化網(wǎng)絡(luò)微觀結(jié)構(gòu)是怎么改變的,那么,無機(jī)填料的引入是如何影響EPDM橡膠的交聯(lián)網(wǎng)絡(luò)及相應(yīng)的宏觀性能的,是目前亟需解決的關(guān)鍵問題。本論文主要是從以下三個方面進(jìn)行研究:1.EPDM/CaCO_3復(fù)合材料的sub-Rouse轉(zhuǎn)變行為。通過DMA數(shù)據(jù)分析,不同含量納米碳酸鈣對非完全交聯(lián)的三元乙丙橡膠的鏈段網(wǎng)絡(luò)結(jié)構(gòu)松弛的行為的影響進(jìn)行研究,可以得到三元乙丙橡膠的轉(zhuǎn)折溫度(即動力學(xué)轉(zhuǎn)折點)為385K,松弛時間的轉(zhuǎn)折點為0.18s,轉(zhuǎn)折點的發(fā)生時由于在轉(zhuǎn)折溫度下分子間的相互作用比較強烈,由于耦合作用的發(fā)生導(dǎo)致在隨著溫度倒數(shù)的增加,松弛時間的變化開始變得平緩,使得鏈段運動的增長趨勢減弱,在實驗的過程中不斷的增加納米碳酸鈣的含量,溫度轉(zhuǎn)折點是逐漸增加的,松弛時間的轉(zhuǎn)折點是逐漸降低的,這從微觀的角度更加充分的證實了無機(jī)碳酸鈣粒子的引入限制了三元乙丙橡膠的鏈段運動。2.CaCO_3對EPDM/PP/CaCO_3復(fù)合材料的sub-Rouse轉(zhuǎn)變行為及力學(xué)性能的影響。通過XRD、DSC、TEM、DMA和力學(xué)性能的測試,在非交聯(lián)的聚合物的共混EPDM/PP復(fù)合體系中,經(jīng)過我們的研究發(fā)現(xiàn)PP對EPDM中sub-Rouse的影響可以忽略,隨著碳酸鈣含量在聚合物體系中增加,它增加了PP的結(jié)晶度,此時PP的結(jié)晶度對EPDM鏈段運動的阻礙作用占據(jù)主要地位,從而降低了EPDM鏈段的豫馳強度,使得轉(zhuǎn)折點的溫度升高:當(dāng)碳酸鈣的含量增加到4phr時,碳酸鈣在EPDM中占據(jù)主要的地位,碳酸鈣含量的增加,使得EPDM鏈段的距離增加,促進(jìn)了 EPDM鏈段的運動,使得轉(zhuǎn)折點的溫度不斷地下降。3.PP對EPDM/PP/CaCO_3復(fù)合材料的鏈段豫馳行為和力學(xué)性能的影響。本文制備了 EPDM/PP/CaCO_3三元納米復(fù)合材料,與之前不同的是這次是改變有機(jī)物聚丙烯對三元乙丙橡膠鏈段運動的改變,我們采用了 DSC設(shè)備對復(fù)合物的結(jié)晶度進(jìn)行了測量,用動態(tài)力學(xué)分析儀來測試鏈段運動,同時還測得了復(fù)合物的力學(xué)性能。DSC的測量結(jié)果表明結(jié)晶度逐漸升高。動態(tài)力學(xué)分析儀(DMA)的數(shù)據(jù)表明了納米顆粒限制了三元乙丙橡膠的鏈段運動導(dǎo)致sub-Rouse轉(zhuǎn)變峰的強度降低,同時聚丙烯的加入使得復(fù)合物的結(jié)品度增加,阻礙了三元乙丙橡膠的鏈段運動,同樣的也導(dǎo)致sub-Rouse轉(zhuǎn)變峰的強度降低。同時也對三元復(fù)合材料進(jìn)行了力學(xué)分析,聚丙烯是增強相,拉伸強度隨著PP含量的增加而增加;由于PP和EPDM的分散情況導(dǎo)致了斷裂伸長率隨著含量的增加先減少后增加。
[Abstract]:Ethylene-propylene diene diene diene rubber (EPDM) has excellent properties of ozone resistance, heat resistance, weathering resistance and aging resistance. In order to improve the mechanical and functional properties of rubber, a variety of inorganic particles are usually filled. However, the mechanical properties and application fields of polymer materials will be affected. In this paper, the chain relaxation behavior of EPDM is mainly discussed. The improvement of polymer properties depends on how the microstructure of rubber vulcanization network changes. So, how the introduction of inorganic filler affects the crosslinking network and the corresponding macroscopic properties of EPDM rubber. It is the key problem that needs to be solved at present. This paper mainly studies from the following three aspects:. 1. The sub-Rouse transition behavior of EPDM / CaCO3 composites. DMA data were analyzed. The effects of different content of nano-CaCO3 on the relaxation of the chain structure of non-fully crosslinked EPDM were studied. The turning temperature of EPDM is 385K, and the turning point of relaxation time is 0.18s. When the turning point occurs, the intermolecular interaction is stronger at the transition temperature, and the relaxation time changes gradually with the increase of the reciprocal temperature due to the coupling effect. The increasing trend of the chain motion is weakened, and the temperature turning point is increasing gradually, and the relaxation time turning point is gradually decreasing. From the microcosmic point of view, it is more fully confirmed that the introduction of inorganic calcium carbonate particles restricts the segment movement of EPDM. 2. The su of CaCOS3 to EPDM/PP/CaCO_3 composites. Effect of b-Rouse transition behavior and mechanical properties through XRD. DSC-Tem EPDM/PP and mechanical properties were tested in non-crosslinked polymer blend EPDM/PP composite system. We found that the effect of PP on sub-Rouse in EPDM is negligible. With the increase of calcium carbonate content in polymer system, it increases the crystallinity of PP. At this time, the degree of crystallinity of PP has a dominant effect on the movement of EPDM segment, thus reducing the relaxation strength of EPDM segment. When the content of calcium carbonate increased to 4phr, calcium carbonate occupied the main position in EPDM, and the increase of calcium carbonate content increased the distance of EPDM segment. Promoted the movement of EPDM segment. The effect of PP on the chain behavior and mechanical properties of EPDM/PP/CaCO_3 composites was investigated. EPDM/PP/CaCO_3 ternary nanocomposites. In contrast to the previous change in the movement of organic polypropylene to the EPDM segment, the crystallinity of the composite was measured using a DSC device. The motion of the chain was measured by dynamic mechanical analyzer. At the same time, the mechanical properties of the composites were measured. DSC results showed that the crystallinity increased gradually. Dynamic Mechanics Analyzer (DMA). The results showed that the sub-Rouse transition peak strength was decreased due to the restriction of the chain motion of EPDM. At the same time, the addition of polypropylene increased the binding degree of the composite, which hindered the segment movement of EPDM. At the same time, the strength of the sub-Rouse transition peak was decreased. The mechanical analysis of the ternary composites also showed that polypropylene was a reinforced phase, and the tensile strength increased with the increase of PP content. Because of the dispersion of PP and EPDM, the elongation at break decreases first and then increases with the increase of content.
【學(xué)位授予單位】：中國科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ333.4;TB332

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