發(fā)布時(shí)間：2018-02-13 02:46

  本文關(guān)鍵詞： 聚對(duì)苯二甲酸丁二醇酯 熔融接枝 增韌 協(xié)同增韌　出處：《長(zhǎng)春工業(yè)大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：通過(guò)熔融接枝的方法制備了POE-g-GMA、POE-g-(GMA-co-St)兩種接枝物,將純POE和兩種接枝物分別與PBT進(jìn)行熔融共混,考察了三種彈性體對(duì)聚對(duì)苯二甲酸丁二醇酯(PBT)的力學(xué)行性能的影響,結(jié)果表明,在相同情況下,單組分接枝物對(duì)PBT的增韌效果不明顯,雙組分接枝物的增韌效果最好,大大改善了PBT的性能,增韌后共混物的沖擊強(qiáng)度是前兩種改性物增韌效果的十倍左右。三種不同改性劑對(duì)共混物的彈性模量和屈服強(qiáng)度影響不大。彎曲強(qiáng)度隨著GMA、St的引入在一定程度上有所降低。總的來(lái)說(shuō),GMA、St的引入對(duì)PBT的增韌起到積極作用。通過(guò)熔融接枝法合成了不同GMA含量的POE-g-(GMA-co-St),考察了不同接枝率的改性POE對(duì)于增韌PBT的影響。結(jié)果表明,GMA的用量對(duì)共混物的力學(xué)性能有影響,但影響不大。綜合各項(xiàng)性能可以看出,GMA含量為1%時(shí)共混物的增韌效果最佳,隨著改性劑的不斷加入,共混物的沖擊性能得以提高,彈性體用量在10%~15%之間即完成脆韌轉(zhuǎn)變,繼續(xù)增加彈性體用量,沖擊性能繼續(xù)增強(qiáng),但逐漸趨于平緩。共混物的拉伸性能和彎曲性能均隨著彈性體用量的增加逐漸降低,但GMA含量對(duì)共混物的拉伸性能和彎曲性能影響不大。選用不同牌號(hào)的POE彈性體,并對(duì)其進(jìn)行官能化,官能化所用GMA含量相同,探究POE的物理性能對(duì)增韌效果的影響。結(jié)果表明,不同牌號(hào)的POE對(duì)PBT的增韌效果不同,說(shuō)明POE的物理性能對(duì)PBT的增韌效果有影響。探究?jī)煞N彈性體協(xié)同增韌PBT的效果。將POE分別與EPDM、LDPE、LLDPE按不同比例混合,將混合好的彈性體分別與PBT進(jìn)行共混,保證改性劑所占份數(shù)相同。考察了EPDM、LDPE和LLDPE的引入對(duì)共混物力學(xué)性能的影響。結(jié)果表明,在增韌PBT時(shí),官能化的純POE對(duì)共混物的增韌效果最佳,LDPE和LLDPE的引入,顯著降低了PBT/POE共混物的力學(xué)性能。引入量的多少,對(duì)共混物的性能影響不大。
[Abstract]:Two kinds of POE-g-GMA-co-St-POE-g-GMA-POE-g-GMA-co-St. were prepared by melt grafting method. The pure POE and the two grafted polymers were fused blended with PBT respectively. The effects of three elastomers on the mechanical properties of poly (butylene terephthalate) (PBT) were investigated. Under the same conditions, the toughening effect of mono-component grafted polymer on PBT is not obvious, and the toughening effect of two-component grafted polymer is the best, which greatly improves the properties of PBT. The impact strength of the toughened blends was about ten times that of the first two modifiers. The three modifiers had little effect on the elastic modulus and yield strength of the blends. The flexural strength of the blends increased with the introduction of GMA-St to a certain extent. In general, the introduction of GMA St played a positive role in the toughening of PBT. POE-g-GMA-co-Stan with different content of GMA was synthesized by melt grafting method. The effect of modified POE with different grafted ratio on toughening PBT was investigated. The quantity has an effect on the mechanical properties of the blend, But the effect was not significant. The toughening effect of the blends was the best when the content of GMA was 1. With the addition of modifier, the impact properties of the blends were improved, and the brittleness and toughness transition was completed when the content of the elastomer was between 10% and 15%. With the increase of the amount of elastomer, the impact properties of the blends continued to increase, but gradually tended to smooth. The tensile properties and bending properties of the blends decreased with the increase of the content of elastomer. However, the content of GMA has little effect on the tensile and flexural properties of the blends. POE elastomers of different grades are selected and functionalized. The content of GMA used in functionalization is the same. The effect of the physical properties of POE on the toughening effect is investigated. Different grades of POE have different toughening effects on PBT, indicating that the physical properties of POE have an effect on the toughening effect of PBT. The mixed elastomer was blended with PBT to ensure that the content of modifier was the same. The effect of the introduction of LLDPE and LLDPE on the mechanical properties of the blend was investigated. The results showed that the blends were toughened with PBT. The toughening effect of functionalized pure POE blends was the best. The introduction of LDPE and LLDPE significantly reduced the mechanical properties of PBT/POE blends, but the addition amount had little effect on the properties of the blends.
【學(xué)位授予單位】：長(zhǎng)春工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：O633.14

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