인계 난연제인 PBPP2를 2단계 중합 공정을 통해 준비하고 polylactide (PLA)에 적용하여 이의 난연성 및 가소 효과에 대한 연구를 진행하였다. PLA는 락타이드의 개환중합을 통해 중합되었다. PBPP2 함유정도에 따른 용액 주조 방법을 통해 제조된 순수 PLA 및 난연 PLA 필름의 난연성을 조사하였다. 3 중량 퍼센트의 PBPP2가 PLA에 첨가될 때, 한계 산소 지수 (...
인계 난연제인 PBPP2를 2단계 중합 공정을 통해 준비하고 polylactide (PLA)에 적용하여 이의 난연성 및 가소 효과에 대한 연구를 진행하였다. PLA는 락타이드의 개환중합을 통해 중합되었다. PBPP2 함유정도에 따른 용액 주조 방법을 통해 제조된 순수 PLA 및 난연 PLA 필름의 난연성을 조사하였다. 3 중량 퍼센트의 PBPP2가 PLA에 첨가될 때, 한계 산소 지수 (LOI)가 23%에서 30%로 증가되었으며, UL 94 테스트에서 V-0 등급을 달성하였다. 또한 PBPP2는 PLA의 최대 열분해 온도를 증가시켜 PBPP2 3 중량 퍼센트가 PLA의 난연성 및 열 안정성을 동시에 향상시키는데 충분함을 나타내었다. 이를 통해 PBPP2가 분해 시 차르를 형성하여 PLA의 연소를 지연시키는 응축상 난연 메커니즘을 가지는 것을 확인하였다. 추가적으로, 순수 PLA와 비교하였을 때, PBPP2가 3 중량 퍼센트 첨가 된 PLA에 대한 Tm의 감소 및 신율의 증가를 통해 PBPP2는 PLA에 대해 가소제로서 작용하는 것을 확인하였다.
인계 난연제인 PBPP2를 2단계 중합 공정을 통해 준비하고 polylactide (PLA)에 적용하여 이의 난연성 및 가소 효과에 대한 연구를 진행하였다. PLA는 락타이드의 개환중합을 통해 중합되었다. PBPP2 함유정도에 따른 용액 주조 방법을 통해 제조된 순수 PLA 및 난연 PLA 필름의 난연성을 조사하였다. 3 중량 퍼센트의 PBPP2가 PLA에 첨가될 때, 한계 산소 지수 (LOI)가 23%에서 30%로 증가되었으며, UL 94 테스트에서 V-0 등급을 달성하였다. 또한 PBPP2는 PLA의 최대 열분해 온도를 증가시켜 PBPP2 3 중량 퍼센트가 PLA의 난연성 및 열 안정성을 동시에 향상시키는데 충분함을 나타내었다. 이를 통해 PBPP2가 분해 시 차르를 형성하여 PLA의 연소를 지연시키는 응축상 난연 메커니즘을 가지는 것을 확인하였다. 추가적으로, 순수 PLA와 비교하였을 때, PBPP2가 3 중량 퍼센트 첨가 된 PLA에 대한 Tm의 감소 및 신율의 증가를 통해 PBPP2는 PLA에 대해 가소제로서 작용하는 것을 확인하였다.
Plastics have made a large contribution to industrial development around the world. Therefore, they have become an important material for everyday life. Recently, the research trend on plastics has been transferred from petroleum plastics to bioplastics because of environmental problems. Polylactide...
Plastics have made a large contribution to industrial development around the world. Therefore, they have become an important material for everyday life. Recently, the research trend on plastics has been transferred from petroleum plastics to bioplastics because of environmental problems. Polylactide (PLA), one of representative bioplastics, is a biodegradable polymer, which is produced from sustainable resource. While PLA has excellent mechanical properties and biodegradability, it is difficult to apply to various fields due to its brittle property and flammability. A flame retardant is a material, which prevents combustion of polymer matrix. It can be classified into two-type according to the method of use: additive- and reactive-type. A lot of research on an additive-type flame retardant has been conducted because it is easy to apply to various polymers. Although a halogen-flame retardant shows the superior flame retardant effect, it generates harmful and toxic gas. Accordingly, it is regulated for use. A phosphorus-flame retardant is one of alternative materials for the halogen-flame retardant. The phosphorus compound is regarded as environment-friendly material compared to that of halogen. Although many studies have been conducted, a large amount of flame retardant is needed to improve the flame retarding ability of matrix, so far. It can diminish the intrinsic mechanical property of matrix. Therefore, it is necessary to develop a flame retardant which can enhance the flame retardancy even in a small amount. In this work, it is aimed to simultaneously enhance the flame retarding ability and improve the brittle property with low content of flame retardant for PLA. A novel polymeric flame retardant, PBPP2, for polylactide (PLA) was synthesized via a two-step polymerization process. The flame retardancy of neat PLA and flame retarded PLA films prepared via solution casting method with different PBPP2 ratios were then investigated. When only the 3 wt% PBPP2 was added to PLA, the limiting oxygen index (LOI) was increased from 23% to 30%. Additionally, the required V-0 rating was achieved compared to neat PLA. It was also found that PBPP2 increases the maximum thermal decomposition temperature of PLA, indicating that 3 wt% of PBPP2 is sufficient to improve flame retardancy and thermal stability on PLA, simultaneously. It indicates that PBPP2 has condensed-phase flame retardant mechanism by delaying combustion of PLA via char formation when PBPP2 is decomposed. From both the decrease of Tm and the increase of elongation for PLA with the 3 wt% addition of PBPP2, PBPP2 could be considered to also function as a plasticizer on PLA.
Plastics have made a large contribution to industrial development around the world. Therefore, they have become an important material for everyday life. Recently, the research trend on plastics has been transferred from petroleum plastics to bioplastics because of environmental problems. Polylactide (PLA), one of representative bioplastics, is a biodegradable polymer, which is produced from sustainable resource. While PLA has excellent mechanical properties and biodegradability, it is difficult to apply to various fields due to its brittle property and flammability. A flame retardant is a material, which prevents combustion of polymer matrix. It can be classified into two-type according to the method of use: additive- and reactive-type. A lot of research on an additive-type flame retardant has been conducted because it is easy to apply to various polymers. Although a halogen-flame retardant shows the superior flame retardant effect, it generates harmful and toxic gas. Accordingly, it is regulated for use. A phosphorus-flame retardant is one of alternative materials for the halogen-flame retardant. The phosphorus compound is regarded as environment-friendly material compared to that of halogen. Although many studies have been conducted, a large amount of flame retardant is needed to improve the flame retarding ability of matrix, so far. It can diminish the intrinsic mechanical property of matrix. Therefore, it is necessary to develop a flame retardant which can enhance the flame retardancy even in a small amount. In this work, it is aimed to simultaneously enhance the flame retarding ability and improve the brittle property with low content of flame retardant for PLA. A novel polymeric flame retardant, PBPP2, for polylactide (PLA) was synthesized via a two-step polymerization process. The flame retardancy of neat PLA and flame retarded PLA films prepared via solution casting method with different PBPP2 ratios were then investigated. When only the 3 wt% PBPP2 was added to PLA, the limiting oxygen index (LOI) was increased from 23% to 30%. Additionally, the required V-0 rating was achieved compared to neat PLA. It was also found that PBPP2 increases the maximum thermal decomposition temperature of PLA, indicating that 3 wt% of PBPP2 is sufficient to improve flame retardancy and thermal stability on PLA, simultaneously. It indicates that PBPP2 has condensed-phase flame retardant mechanism by delaying combustion of PLA via char formation when PBPP2 is decomposed. From both the decrease of Tm and the increase of elongation for PLA with the 3 wt% addition of PBPP2, PBPP2 could be considered to also function as a plasticizer on PLA.
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