Reinforcement， Toughening and Heat⁃resistant Modification of Recycled Poly（butylene terephthalate）

doi:10.19491/j.issn.1001-9278.2021.04.015

Abstract

Abstract:

The recycled poly（butylene terephthalate）（r-PBT）/epoxidized elastomer （EVMG） blends were prepared by a reactive melt blending method using r-PBT as a raw materials. The effect of EVMG on the mechanical properties of r-PBT blends was studied systematically. The results indicated that EVMG was uniformly dispersed in the r-PBT matrix and its particle diameter was determined to be 500 nm. The notched impact strength and the elongation at break of the （r-PBT）/ EVMG） blends increased by 14 times and 7 times at an EVMG content of 20 wt%， respectively. Furthermore， glass fibers （GF） were incorporated to improve the mechanical strength and heat resistance of the blends. After adding 30 wt% GF， the tensile strength and flexural strength of r-PBT/EVMG/GF composites increased by 70 % with good toughness maintained. In addition， the thermal deformation temperature of the blends increased up to 176 ℃. This work provides a new idea for the reuse of r-PBT.

Key words: recycled poly（butylene terephthalate）, epoxidized elastomer, toughening, heat-resistance

CLC Number:

TQ 325.3

CAO Ying, XU Pengwu, WU Baogou, YANG Weijun, MA Piming. Reinforcement， Toughening and Heat⁃resistant Modification of Recycled Poly（butylene terephthalate）[J]. China Plastics, 2021, 35(4): 86-92.

Figures/Tables 9

Fig. 1. Stress?strain curves and notched impact strength of the r?PBT and the blends

样品	拉伸强度/ MPa	断裂伸长率/ %	缺口冲击强度/ kJ ? m^-2
PBT	53.5±3.8	20±3.3	4.0±0.2
PBT/EVMG (90/10)	39.0±1.8	50±5.1	10.7±1.2
PBT/EVMG (85/15)	35.5±3.1	69±6.2	15.3±1.5
PBT/EVMG (80/20)	30.0±1.5	184±10.2	70.0±3.5

Tab. 1. Mechanical properties of PBT and PBT/EVMG blends

Fig. 2. Proposed reaction mechanism between r?PBT and EVMG

Fig.3. FTIR and TGA curves of r?PBT, EVMG and purified r?PBT/EVMG blends

Fig.4. Torque of r?PBT blends in the blending process as a function of blending time

Fig.5. SEM of cryo?fractured sections of the r?PBT blends

Fig.6. SEM of impact fractured sections of the r?PBT and the blends

Fig.7. Stress?strain curves, tensile strength, notched impacted strength and flexural strength of PBT/EVMG/GF blends

Fig. 8. HDT of r?PBT and r?PBT blends

References 18

1	SASANUMA Y， WAGAI Y， SUZUKI N， et al. Conformational Characteristics and Configurational Properties of Poly（Butylene Terephthalate） and Structure⁃Property Relationships of Aromatic Polyesters［J］. Polymer， 2013， 54 （15）： 3 904⁃3 913.
2	ZHU J， CAI J， XIE W， et al. Poly（Butylene 2，5⁃Furan Dicarboxylate）， a Biobased Alternative to PBT： Synthesis， Physical Properties， and Crystal Structure［J］. Macromolecules， 2013， 46（3）：796⁃804.
3	DONG L J， ZHANG H X， YANG H D， et al. Toughening of PBT by Means of Blending with Graft Copolymer EPM⁃g⁃GMA［J］. Acta Polymerica Sinica， 2003， 1（2）：167⁃170.
4	DENG S， BAI H， LIU Z， et al. Toward Supertough and Heat⁃Resistant Stereocomplex⁃Type Polylactide/Elastomer Blends with Impressive Melt Stability via in Situ Formation of Graft Copolymer During One⁃Pot Reactive Melt Blending［J］. Macromolecules， 2019， 52（4）： 1 718⁃1 730.
5	HUANG L， JIANG W， AN L J， et al. Brittle⁃Ductile Transition of Poly （Butylene Terephthalate） Toughened with Epoxidized EPDM rubber［J］. Acta Polymerica Sinica， 2005 （4）： 529⁃534.
6	YANG L， CHEN H， JIA S， et al. Influences of Ethylene⁃Butylacrylate⁃Glycidyl Methacrylate on Morphology and Mechanical Properties of Poly （Butylene Terephthalate）/Polyolefin Elastomer Blends［J］. Journal of Applied Polymer Science， 2014， 131（16）： 40660.
7	WANG X， YANG C， YANG J， et al. Toughening Modification of Polycarbonate/Poly （Butylene Terephthalate） Blends Achieved by Simultaneous Addition of Elastomer Particles and Carbon Nanotubes［J］. Composites Part A： Applied Science and Manufacturing， 2016， 90： 200⁃210.
8	曾庆韬，吴保钩，徐鹏武，等. 聚乳酸/环氧化弹性体的反应性增韧改性［J］. 中国科技论文，2018，13（18）：2 055⁃2 059.
	ZENG Q T， WU B G， XU P W， et al. Reactivity Toughening Modification of Poly （Lact Acid）/Epoxy Elastomer［J］. China Science Paper， 2018， 13（18）： 2 055⁃2 059.
9	刘琪，何祥，吕通建，等. 乙烯丙烯酸甲酯甲基丙烯酸缩水甘油酯三元共聚物增韧PBT的研究［J］. 中国塑料， 2016， 30（02）： 54⁃58.
	LIU Q， HE X， LYU T J， et al. Study on Polybutylene Terephthalate Toughened by Ethylene⁃methyl Acrylate⁃glycidyl Methacrylate Terpolymer［J］. China Plastics， 2016， 30 （02）： 54⁃58.
10	AROSTEGUI A， NAZABAL J. Supertoughness and Critical Interparticle Distance Dependence in Poly （Butylene Terephthalate） and Poly （Ethylene⁃co⁃Glycidyl Methacrylate） Blends［J］. Journal of Polymer Science Part B： Polymer Physics， 2003， 41（19）： 2 236⁃2 247.
11	魏刚，彭娅，黄锐. 官能化聚烯烃弹性体增韧PBT［J］. 合成树脂与塑料，2006，23（1）：29⁃32.
	WEI G， PENG Y， HUANG R. Toughening PBT by Functionalized Polyolefin Elastomers［J］. China Synthetic Resin and Plastics， 2006， 23 （1）： 29⁃32.
12	MA P， XU P， ZHAI Y， et al. Biobased Poly （Lactide）/Ethylene⁃co⁃Vinyl Acetate Thermoplastic Vulcanizates： Morphology Evolution， Superior Properties， and Partial Degradability［J］. ACS Sustainable Chemistry & Engineering， 2015， 3（9）： 2 211⁃2 219.
13	XU P， YANG W， NIU D， et al. Multifunctional and Robust Polyhydroxyalkanoate Nanocomposites with Superior Gas Barrier， Heat Resistant and Inherent Antibacterial Performances［J］. Chemical Engineering Journal， 2020， 382 （15）：122864.
14	WU B， ZENG Q， NIU D， et al. Design of Supertoughened and Heat⁃Resistant PLLA/Elastomer Blends by Controlling the Distribution of Stereocomplex Crystallites and the Morphology［J］. Macromolecules， 2019， 52（3）： 1 092⁃1 103.
15	XIE L， XIE Y， WU Q， et al. Effect of Poly（acrylic acid）⁃Modified Poly（ethylene terephthalate） on Improving the Integrated Mechanical Properties of Poly（ethylene terephthalate）/Elastomer Blend［J］. Industrial & Engineering Chemistry Research， 2015， 54（17）： 4 748⁃4 755.
16	ROBERTSON M L， PAXTON J M， HILLMYER M A. Tough Blends of Polylactide and Castor Oil［J］. ACS Applied Materials & Interfaces， 2011， 3（9）： 3 402⁃3 410.
17	ZHANG D， HE M， QIN S， et al. Study on Dynamic Mechanical， Thermal， and Mechanical Properties of Long Glass Fiber Reinforced Thermoplastic Polyurethane/Poly （Butylene Terephthalate） Composites［J］. Polymer Composites， 2018， 39（1）： 63⁃72.
18	DESHMUKH G S， PESHWE D R， PATHAK S U， et al. Effect of Functionalized Elastomer Addition on Mechanical and Interfacial Properties of Poly （Butylene Terephthalate）/Glass Fiber Composites［J］. Polymer composites， 2012， 33（1）： 58⁃67.

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