Phosphoric Acid Catalyzed Polycondensation of Diol and Dicarboxylic Acid
- 주제(키워드) Biodegradable polyester , poly(butylene succinate) , polycondensation , phosphoric acid , Ionomer
- 주제(DDC) 547
- 발행기관 아주대학교
- 지도교수 이분열
- 발행년도 2022
- 학위수여년월 2022. 2
- 학위명 석사
- 학과 및 전공 일반대학원 분자과학기술학과
- 실제URI http://www.dcollection.net/handler/ajou/000000031430
- 본문언어 영어
- 저작권 아주대학교 논문은 저작권에 의해 보호받습니다.
초록/요약
Synthetic biodegradable polyesters such as PBAT suffer from slow biodegradability in ambient conditions. Facing the concern of slow biodegradability, We synthesized polyester in a different route from the conventional synthesis method. Conventional methods made of metal catalysts and chain extenders have increased molecular weight to supplement physical properties. However, there is a trade-off between the molecular weight and biodegradability; increasing molecular weight with urethane linkages deteriorates biodegradability. we envisage a different route: phosphoric acid catalyzed diacid/diol polycondensation to generate polyester chains with phosphate pendant groups (e.g., -O(O)P(OH)2), which were subsequently treated with divalent metal carboxylate (RCO2)2M (M = Zn, Mg, Ca) (Scheme 1b). Phosphate as well as Ca, Mg, Zn ions are essential nutrients in plant growth, the resulting polymers can be a slow-releasing fertilizer during composting. Here, we prepared PBS and derivatives for PBAT prior research. Results were obtained by analyzing tensile property and rheological property. Combing the concepts of macromolecules and aggregates, it was possible to produce polyester having superior mechanical strength and viscosity than conventional polyester. It will also have a positive effect in terms of biodegradability.
more목차
1. Introduction 1
2. Results and Discussion 4
2.1 H3PO4 catalyzed polycondensation of 1,4-butanediol and succinic acid 4
2.2 H3PO4 catalyzed polycondensation with various diacid and diol 12
3. Conclusions 15
4. Experimental Section 16
4.1 General remarks 16
4.2 Preparation of PBS (Table 1 entry 4) 16
4.3 Preparation of PBG (Table 2 entry 3) 17
4.4 Tensile studies 18
4.5 Oscillation test 18
5. Acknowledgements 18
6. Reference 18
