聚丙烯酸酯改性纤维素基脲醛树脂模塑料性能研究

doi:10.3969/j.issn.0253-2417.2015.02.008

林产化学与工业 ›› 2015, Vol. 35 ›› Issue (2): 55-61.doi: 10.3969/j.issn.0253-2417.2015.02.008

聚丙烯酸酯改性纤维素基脲醛树脂模塑料性能研究

刘娟¹, 南静娅¹, 王春鹏^1,2, 刘玉鹏¹, 陈日清^1,2

1. 中国林业科学研究院林产化学工业研究所, 生物质化学利用国家工程实验室, 国家林业局林产化学工程重点开放性实验室, 江苏省生物质能源与材料重点实验室, 江苏南京 210042;
2. 中国林业科学研究院林业新技术研究所, 北京 100091

收稿日期:2014-09-04 出版日期:2015-04-25 发布日期:2015-04-24
通讯作者: 陈日清,副研究员,硕士生导师,主要从事胶黏剂化学研究与开发;E-mail:michaelmao77@163.com。 E-mail:michaelmao77@163.com
作者简介:刘娟(1987-),女,山东潍坊人,硕士生,主要从事高分子材料制备与性能研究
基金资助:
中国林科院林业新技术所基本科研业务费专项资金(CAFINT2010K04)

Plastics Performance of Cellulose Based Urea-formaldehyde Resins Modified by Poly (MMA-BA-MAA) Copolymer

LIU Juan¹, NAN Jing-ya¹, WANG Chun-peng^1,2, LIU Yu-peng¹, CHEN Ri-qing^1,2

1. Institute of Chemical Industry of Forest Products, CAF;National Engineering Lab.for Biomass Chemical Utilization; Key and Open Lab.of Forest Chemical Engineering, SFA;Key Lab.of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China;
2. Research Institute of Forestry New Technology, CAF, Beijing 100091, China

Received:2014-09-04 Online:2015-04-25 Published:2015-04-24

摘要/Abstract

摘要： 以甲基丙烯酸甲酯(MMA)、丙烯酸正丁酯(BA)和α-甲基丙烯酸(α-MAA)为单体,通过种子乳液聚合制备了聚丙烯酸酯乳液共聚物(PMBM),研究了PMBM玻璃化温度(T_g)分别为80、60和40 ℃的S1、S2和S3及添加量对纤维素基脲醛树脂模塑料的收缩率、力学性能及热稳定性能等影响,并采用动态力学机械分析(DMA)和电镜扫描(SEM)研究了改性前后脲醛树脂模塑料动态力学性能和冲击断面的微观结构。结果表明,玻璃化温度为40 ℃的PMBM(S3)对脲醛树脂模塑料的增韧效果最好;当S3添加量为20%时,脲醛树脂模塑料韧性最好,其模塑料收缩率为0.23%,冲击强度为2.47 kJ/m²,弯曲强度为75.16 MPa,其中冲击强度和弯曲强度分别比未改性的脲醛树脂模塑料提高了44.4%和39.0%;添加PMBM会降低脲醛树脂模塑料体系的热失重速率,模塑料耐低温性能得到提高。由DMA测试结果可知,S3对模塑料的增韧效果显著,且与脲醛树脂的相容性较好;此外,由SEM分析可知添加20%S3增韧的模塑料断面粗糙,断口光滑,趋于韧性断裂。

关键词: 聚丙烯酸酯, 纤维素基脲醛树脂, 模塑料, 增韧改性, 力学性能, 热稳定性

Abstract: Polyacrylate emulsion copolymer (PMBM) was prepared by seeded emulsion polymerization with methyl methacrylate (MMA),n-butyl acrylate (BA) and methyl acrylic acid (MAA) as monomers, which was used as toughening modifier for cellulose based urea-formaldehyde (UF) resin molding compound. The effects of PMBM’s glass transition temperature and contents on the mechanical properties, thermal stability and molding shrinkage rate of the compound were investigated. Moreover, the dynamic mechanical properties and microstructure of fracture surface were studied with dynamic mechanical analysis (DMA) and scanning electron microscope (SEM). The results showed that the toughening effect of PMBM (S3) with T_g of 40 ℃ was the most significant. The toughness of the modified system with 20 % PMBM was the best, and the shrinkage rate was 0.23%. And the impact strength and bending strength were 2.47 kJ/m² and 75.16 MPa, which were increased by 44.4% and 39.0% compared with those of the unmodified system, respectively. Thermal weight loss rate of molding plastic could be reduced by adding PMBM, so the thermal stability was improved. The DMA test results showed that S3 had the remarkable toughening effects on the molding compound, and its compatibility with urea-formaldehyde resin was better. In addition, fracture surface of molding compound modified with 20% S3 appeared as ductile fracture.

Key words: polyacrylate, cellulose based urea-formaldehyde resin, molding compound, toughening modification, mechanical properties, thermal stability

中图分类号:

TQ35

刘娟, 南静娅, 王春鹏, 刘玉鹏, 陈日清. 聚丙烯酸酯改性纤维素基脲醛树脂模塑料性能研究[J]. 林产化学与工业, 2015, 35(2): 55-61.

LIU Juan, NAN Jing-ya, WANG Chun-peng, LIU Yu-peng, CHEN Ri-qing. Plastics Performance of Cellulose Based Urea-formaldehyde Resins Modified by Poly (MMA-BA-MAA) Copolymer[J]. Chemistry and Industry of Forest Products, 2015, 35(2): 55-61.

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聚丙烯酸酯改性纤维素基脲醛树脂模塑料性能研究

Plastics Performance of Cellulose Based Urea-formaldehyde Resins Modified by Poly (MMA-BA-MAA) Copolymer

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