ADR4370S擴(kuò)鏈改性PBT及其復(fù)合材料的性能研究
發(fā)布時間：2019-03-08 19:41
【摘要】：聚對苯二甲酸丁二醇酯(PBT)因具有優(yōu)異的力學(xué)性能、耐化學(xué)腐蝕、優(yōu)良的耐濕熱老化性能和介電性,被廣泛應(yīng)用于電子電器、汽車和機(jī)械行業(yè)以及光纖光纜等領(lǐng)域。但PBT仍有許多不足之處,如缺口沖擊強(qiáng)度低、易翹曲等。尤其國產(chǎn)的PBT樹脂,因分子量低、特性黏度小、力學(xué)性能差等原因,不能滿足光纖級材料的要求。本文采用化學(xué)擴(kuò)鏈、增韌、增強(qiáng)等方法對PBT進(jìn)行改性。首先,采用環(huán)氧擴(kuò)鏈劑ADR4370S對PBT進(jìn)行擴(kuò)鏈改性,研究不同擴(kuò)鏈劑用量對體系的結(jié)構(gòu)與性能的影響以及擴(kuò)鏈體系的力學(xué)性能和熱穩(wěn)定性能。結(jié)果表明,ADR4370S的添加,使PBT分子結(jié)構(gòu)發(fā)生變化,產(chǎn)生梳型支化結(jié)構(gòu),有效提高了PBT的熔體黏度和熔體強(qiáng)度,體系的力學(xué)性能得到明顯改善,熱穩(wěn)定性與Tg變化不大。但ADR4370S過量時,PBT擴(kuò)鏈產(chǎn)物發(fā)生溶膠凝膠轉(zhuǎn)變。其次,測試PBT擴(kuò)鏈產(chǎn)物的特性黏度,并研究體系的非等溫結(jié)晶行為。結(jié)果表明,當(dāng)ADR4370S用量為1.50 wt%時,擴(kuò)鏈產(chǎn)物的特性黏度[η]從1.061dL/g提高至1.486 dL/g,粘均分子量為從35117提高至51681,且與PA1.25擴(kuò)鏈體系相當(dāng)。.同時,ADR4370S有利于提高PBT的結(jié)晶溫度。Mo法能較好的描述PBT及其擴(kuò)鏈體系的非等溫結(jié)晶過程,而Jeziorny法只能較好地描述體系的非等溫結(jié)晶的初期過程。ADR4370S可降低體系的結(jié)晶活化能,但對PBT的基體成核機(jī)理和生長方式基本沒有影響。再次,先將ADR4370S熔融分散于POE中,再與PBT樹脂進(jìn)行增韌擴(kuò)鏈。探討擴(kuò)鏈劑的加入對共混體系中PBT的結(jié)構(gòu)與性能影響。結(jié)果表明,環(huán)氧擴(kuò)鏈劑與POE并不發(fā)生反應(yīng),但能夠有效的對PBT進(jìn)行擴(kuò)鏈改性,使得復(fù)合材料的儲能模量、損耗模量和復(fù)數(shù)黏度提高,拉伸強(qiáng)度、缺口沖擊強(qiáng)度和彎曲模量也得到改善,但擴(kuò)鏈反應(yīng)的進(jìn)行也使得體系產(chǎn)生了支化結(jié)構(gòu)。最后,以經(jīng)1.25 wt%ADR4370S擴(kuò)鏈改性后的PBT樹脂為基體,OMMT為無機(jī)納米填充材料,通過熔融插層法制備納米復(fù)合材料,研究OMMT的添加量對PA1.25體系的相形態(tài)和性能的影響。結(jié)果表明,OMMT含量較少時,復(fù)合材料的熔體黏度和模量均降低,但拉伸強(qiáng)度和彎曲模量均提高。當(dāng)OMMT含量為0.5 wt%時,材料的結(jié)晶溫度最高,半結(jié)晶時間最小,且缺口沖擊強(qiáng)度最大。
[Abstract]:The polybutylene terephthalate (PBT) has excellent mechanical property, chemical corrosion resistance, excellent heat and heat aging resistance and dielectric property, and is widely applied to the fields of electronic equipment, automobile and machinery industry, optical fiber optical cable and the like. However, PBT still has many disadvantages, such as low notch impact strength, easy to warp, and the like. In particular, the domestic PBT resin can not meet the requirements of the fiber-grade material due to low molecular weight, low intrinsic viscosity, poor mechanical property and the like. In this paper, PBT is modified by chemical chain extension, toughening and strengthening. First, the effect of different chain extender on the structure and performance of the system and the mechanical properties and thermal stability of the chain extender were studied by using the epoxy chain extender (ADR4370S). The results show that the addition of the ADR4370S makes the molecular structure of the PBT be changed, and the comb-type branching structure is produced, the melt viscosity and the melt strength of the PBT are effectively improved, the mechanical property of the system is obviously improved, and the thermal stability and the Tg change are not large. However, when the ADR4370S is excessive, a sol-gel transition occurs in the PBT chain extension. Secondly, the intrinsic viscosity of the product of PBT chain extension was tested and the non-isothermal crystallization behavior of the system was studied. The results show that, when the amount of ADR4370S is 1.50 wt%, the intrinsic viscosity of the chain extension product is increased from 1.061 dL/ g to 1.486 dL/ g, the viscosity average molecular weight is from 35117 to 51681, and the chain extension system is equivalent to that of the PA1.25 chain extension system. At the same time, the ADR4370S is beneficial to the improvement of the crystallization temperature of PBT. The non-isothermal crystallization process of PBT and its chain extension system can be well described by Mo method, and the Jeziorny method can only better describe the initial process of the non-isothermal crystallization of the system. The ADR4370S can reduce the crystallization activation energy of the system, but has no effect on the nucleation mechanism and the growth mode of the matrix of PBT. And then, the ADR4370S is melted and dispersed in the POE, and then the ADR4370S is toughened and chain-extended with the PBT resin. The effect of the addition of chain extender on the structure and properties of PBT in the blend system was discussed. The results show that the epoxy chain extender does not react with the POE, but can effectively chain-extend the PBT, so that the storage modulus, the loss modulus and the complex viscosity of the composite material are improved, the tensile strength, the notch impact strength and the bending modulus are also improved, But the extension chain reaction is carried out so that the system produces a branched structure. In the end, the effect of the addition of OMMT on the phase morphology and performance of the PA1.25 system was studied by using the PBT resin modified with the chain extension of 1.25 wt% of the ADR4370S as the matrix and the OMMT as the inorganic nano-filling material. The results showed that the melt viscosity and the modulus of the composites decreased when the content of OMMT was small, but the tensile strength and flexural modulus were all improved. When the content of OMMT is 0.5 wt%, the crystallization temperature of the material is the highest, the semi-crystallization time is the minimum, and the notch impact strength is the largest.
【學(xué)位授予單位】：福建師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB33
本文編號：2437141
[Abstract]:The polybutylene terephthalate (PBT) has excellent mechanical property, chemical corrosion resistance, excellent heat and heat aging resistance and dielectric property, and is widely applied to the fields of electronic equipment, automobile and machinery industry, optical fiber optical cable and the like. However, PBT still has many disadvantages, such as low notch impact strength, easy to warp, and the like. In particular, the domestic PBT resin can not meet the requirements of the fiber-grade material due to low molecular weight, low intrinsic viscosity, poor mechanical property and the like. In this paper, PBT is modified by chemical chain extension, toughening and strengthening. First, the effect of different chain extender on the structure and performance of the system and the mechanical properties and thermal stability of the chain extender were studied by using the epoxy chain extender (ADR4370S). The results show that the addition of the ADR4370S makes the molecular structure of the PBT be changed, and the comb-type branching structure is produced, the melt viscosity and the melt strength of the PBT are effectively improved, the mechanical property of the system is obviously improved, and the thermal stability and the Tg change are not large. However, when the ADR4370S is excessive, a sol-gel transition occurs in the PBT chain extension. Secondly, the intrinsic viscosity of the product of PBT chain extension was tested and the non-isothermal crystallization behavior of the system was studied. The results show that, when the amount of ADR4370S is 1.50 wt%, the intrinsic viscosity of the chain extension product is increased from 1.061 dL/ g to 1.486 dL/ g, the viscosity average molecular weight is from 35117 to 51681, and the chain extension system is equivalent to that of the PA1.25 chain extension system. At the same time, the ADR4370S is beneficial to the improvement of the crystallization temperature of PBT. The non-isothermal crystallization process of PBT and its chain extension system can be well described by Mo method, and the Jeziorny method can only better describe the initial process of the non-isothermal crystallization of the system. The ADR4370S can reduce the crystallization activation energy of the system, but has no effect on the nucleation mechanism and the growth mode of the matrix of PBT. And then, the ADR4370S is melted and dispersed in the POE, and then the ADR4370S is toughened and chain-extended with the PBT resin. The effect of the addition of chain extender on the structure and properties of PBT in the blend system was discussed. The results show that the epoxy chain extender does not react with the POE, but can effectively chain-extend the PBT, so that the storage modulus, the loss modulus and the complex viscosity of the composite material are improved, the tensile strength, the notch impact strength and the bending modulus are also improved, But the extension chain reaction is carried out so that the system produces a branched structure. In the end, the effect of the addition of OMMT on the phase morphology and performance of the PA1.25 system was studied by using the PBT resin modified with the chain extension of 1.25 wt% of the ADR4370S as the matrix and the OMMT as the inorganic nano-filling material. The results showed that the melt viscosity and the modulus of the composites decreased when the content of OMMT was small, but the tensile strength and flexural modulus were all improved. When the content of OMMT is 0.5 wt%, the crystallization temperature of the material is the highest, the semi-crystallization time is the minimum, and the notch impact strength is the largest.
【學(xué)位授予單位】：福建師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB33
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