- Synthesis of some organic compounds for application in manufacturing flame-retardant materials.

- Fabrication of inorganic/organic hybrid materials based on modifying carbon nanocomposites with flame-retardant organic compounds.

- Fabrication of inorganic/organic hybrid materials based on modifiying phyllosilicate with flame-retardant organic compounds.

- Fabrication of flame-retardant acrylonitrile butadiene styrene (ABS) –based nanocomposite materials.

- Fabrication of flame-retardant polyethylene (PE)-based nanocomposite materials.

- Development of a technological process for manufacturing fiber optic splice closure and electrical insulation boards from flame-retardant nanocomposite materials.

- Synthesized 24 organic compounds containing DOPO. DOPO and compound FR3 were found as potential flame retardant additives.

- Synthesized 3 organic compounds containing spiro phosphorus heterocycle used to modify flame retardant nanocomposite material.

- Fabricated and researched the characteristics of nanohybrid materials based on carbon nanotubes modified with organic compounds containing DOPO or spiro heterocyclic compounds. The results revealed that DOPO-modified thermally expandable graphite EG@DOPO with 10,4 wt% DOPO and a particle size of 100 mesh is found to be suitable as a fireproof additive.

- Fabricated and researched the characteristics of inorganic/organic hybrid materials based on halloysite (HNTs) or montmorillonite (MMT) modified with organic compounds containing DOPO or spiro heterocyclic compounds. Nanoclay oMMT2 which contained about 12.3 wt% of the ammonium salt and 29.8 wt% of DOPO, possessed an interlayer spacing of 31.5 Å, and a structure and thermal properties suitable as a flame retardant additive.

- Researched and developed a flame retardant combination for nanocomposite materials based on acrylonitrile butadien styrene (ABS) including aluminum trihydroxide/red phosphorus (ATH-RP)mgst (7.5 wt%), EG@DOPO (3,75 wt%) and potassium perfluorobutane sulfonate (3.75 wt%).

- Researched and developed a flame retardant combination for nanocomposite materials based on PC/ABS (80/20 wt%) using a mixture of 1.0 wt% of GNP and 0.5 wt% of PFBS additives. The combination of GNP and PFBS resulted in improved dispersibility of the additives within the PC/ABS blend, delivering good flame-retardancy properties and substantial enhancement in mechanical properties, such as impact strength, tensile strength, and flexural strength, compared to the neat PC/ABS blend.

- Researched and developed a flame retardant combination for nanocomposite materials based on polyethylene (PE) including nanoclay oMMT2 (3 wt%), (ATH-RP)mgst (14 wt%) and EG@DOPO (1 wt%).

- Fabricated zinc borate nanocomposites and evaluated the fire resistance of zinc borate/red phosphorus/expanded graphite nanocomposite based on HDPE resin. The fire resistance of nZB/P/EG/HDPE4 composite (mass ratio 6/10/6/78) achieved the UL-94 V-0 rating and the LOI value of 26.8%.

- Researched and developed a flame retardant combination for epoxy-based nanocomposite materials including APP-PEI mixture (5 wt%) and derivatives containing DOPO (5 wt%). Nanocomposite EP/5APP-PEI/5FE15 exhibited high fire resistance V-0, LOI value of 28.6% and exhibited relatively high mechanical performance with an impact strength of 26- 28 kJ/m2.

- A process for manufacturing flame-retardant ABS-based nanocomposite materials based MB40FRABS has been developed at a scale of 50 kg/batch with ingredients including ABS (69.72 wt%),  (ATH-RP)mgst (15.14 wt). wt%), EG@DOPO (7.57 wt%), and PFBS (7.57 wt%).

- Fabricated 50 pieces of 24FO fiber optic splice closures from flame-retardant ABS-based nanocomposite.

- Fabricated 120 pieces of 24FO fiber optic splice closures from flame-retardant PC/ABS-based nanocomposite. Dimensions (Length x width x height): 410 x 170 x 80 mm. The fire resistance of the fiber optic splice closure achieves UL-94 V-0 and the LOI value of 27.2%. Impact resistance to resist the impact force of a 1 kg round steel ball from a height of 2 m at room temperature, tested according to IEC 61300-2-12 Method B; Compression resistance of 1000 N/25cm2 for 1 hour, tested according to IEC 61300-2-10 standard; Operating temperature range: -10 oC  ̶  65 oC (±2 oC), tested according to IEC 61300-2-22 standard (IEC 60068-2-14 Test Nb).

- A process for manufacturing flame-retardant PE-based nanocomposite materials MB40FRHDPE has been developed at a scale of 50 kg/batch with ingredients HDPE (56,6 wt%), oMMT2 (6 wt%), (ATH-RP)mgst (30 wt%).

- Fabricated 240 pieces of electrical insulation board from flame-retardant PE-based nanocomposite. The fire resistance of the electrical insulation board achieves the UL-94 V-0 and the LOI value of 27.6%. The mechanical properties of the electrical insulation board meet the requirements of TCVN 9569:2013: un-notched impact strength value is 11.9 kJ/m2, modulus of elasticity in tension is 319 Mpa.

- A process for manufacturing flame-retardant ABS-based nanocomposite materials based MB40FRABS has been developed at a scale of 50 kg/batch.

- A process for manufacturing flame-retardant PE-based nanocomposite materials MB40FRHDPE has been developed at a scale of 50 kg/batch.

- A technological process for manufacturing 24FO fiber optic splice closures from flame-retardant ABS-based nanocomposite has been developed.

- A technological process for manufacturing electrical insulation boards from flame- retardant PE-based nanocomposite has been developed.

Synthesized 24 organic compounds containing DOPO and 3 compounds containing spiro phosphorus heterocycle used as flame retardant additives.

- DOPO-modified thermally expandable graphite EG@DOPO with 10,4 wt% DOPO and a particle size of 100 mesh was prepared and was found to be suitable as a fireproof additive.

- Fabricated organic nanoclay oMMT2 based on modification of montmorillonite with DOPO. Nanoclay oMMT2 containing about 12.3% of ammonium salts and 29.8 wt% of DOPO, has an interlayer spacing of 31.5 Å, and a structure and thermal properties suitable as a flame retardant additive.

- Researched and developed a flame retardant combination for nanocomposite materials based on acrylonitrile butadien styrene (ABS) including aluminum trihydroxide/red phosphorus (ATH-RP)mgst (7.5 wt%), EG@DOPO (3,75 wt%) and potassium perfluorobutane sulfonate (3.75 wt%).

- Researched and developed a flame retardant combination for nanocomposite materials based on PC/ABS (80/20 wt%) using a mixture of 1.0 wt% of GNP and 0.5 wt% of PFBS additives. The combination of GNP and PFBS resulted in improved dispersibility of the additives within the PC/ABS blend, delivering good flame-retardancy properties and substantial enhancement in mechanical properties, such as impact strength, tensile strength, and flexural strength, compared to the neat PC/ABS blend.

- Researched and developed a flame retardant combination for nanocomposite materials based on polyethylene (PE) including nanoclay oMMT2 (3 wt%), (ATH-RP)mgst (14 wt%) and EG@DOPO (1 wt%).

- Fabricated zinc borate nanocomposites and evaluated the fire resistance of based the zinc borate/red phosphorus/expanded graphite nanocomposite based on HDPE resin. The fire resistance of nZB/P/EG/HDPE4 composite (mass ratio 6/10/6/78) achieves the UL-94 V-0 rating and the LOI value of 26.8%. 

- Researched and developed a flame retardant combination for epoxy-based nanocomposite materials including APP-PEI mixture (5 wt%) and derivatives containing DOPO (5 wt%). Nanocomposite EP/5APP-PEI/5FE15 exhibited high fire resistance V-0, LOI value of 28.6% and exhibited relatively high mechanical performance with an impact strength of 26- 28 kJ/m2.

- A process for manufacturing flame-retardant ABS-based nanocomposite materials based MB40FRABS has been developed at a scale of 50 kg/batch with ingredients including ABS (69.72 wt%),  (ATH-RP)mgst (15.14 wt). wt%), EG@DOPO (7.57 wt%), and PFBS (7.57 wt%).

- Fabricated 50 pieces of 24FO fiber optic splice closures from flame-retardant ABS-based nanocomposite.

- Fabricated 120 pieces of 24FO fiber optic splice closures from flame-retardant PC/ABS-based nanocomposite. Dimensions (Length x width x height): 410 x 170 x 80 mm. The fire resistance of the fiber optic splice closure achieves UL-94 V-0 and the LOI value of 27.2%. Impact resistance to resist the impact force of a 1 kg round steel ball from a height of 2 m at room temperature, tested according to IEC 61300-2-12 Method B; Compression resistance of 1000 N/25cm2 for 1 hour, tested according to IEC 61300-2-10 standard; Operating temperature range: -10 oC  ̶  65 oC (±2 oC), tested according to IEC 61300-2-22 standard (IEC 60068-2-14 Test Nb).

- A process for manufacturing flame-retardant PE-based nanocomposite materials MB40FRHDPE has been developed at a scale of 50 kg/batch with ingredients HDPE (56,6 wt%), oMMT2 (6 wt%), (ATH-RP)mgst (30 wt%).

- Fabricated 240 pieces of electrical insulation board from flame-retardant PE-based nanocomposite. The fire resistance of the electrical insulation board achieves the UL-94 V-0 and the LOI value of 27.6%. The mechanical properties of the electrical insulation board meet the requirements of TCVN 9569:2013: un-notched impact strength value is 11.9 kJ/m2, modulus of elasticity in tension is 319 Mpa.

Scientific papers in referred journals (list):

a. Scientific papers published in SCIE journals

[1] Quang Vinh Tran*, Thi Nhiem Nguyen, Thi Hai Doan, Tuyet Anh Dang Thi, Ha Thanh Nguyen, Mai Ha Hoang, Pham Thi Lan Huong, Van Tuyen Nguyen*. Preparation of flame retardant polycarbonate-acrylonitrile butadiene styrene composite using graphene nanoplatelets and potassium perfluorobutane sulfonate additives. ChemistrySelect 2023, 8, e202300594. doi.org/10.1002/slct.202300594.

[2] Cong Trinh Duc, Linh Chi Nguyen, Phuc Ban Van, Ha Thanh Nguyen, Tuyet Anh Dang Thi, Giang Le-Nhat-Thuy, Quynh Giang Nguyen Thi, Phuong Hoang Thi, Tuan Anh Nguyen, Quang Vinh Tran, Hung Tran Quang, Mai Ha Hoang, Tuyen Nguyen Van*. Synthesis of new DOPO derivatives and investigation of their synergistic effect with APP–PEI on the flame retardancy of epoxy composite. RSC Advances 2024, 14, 5264-5275. doi.org/ 10.1039/d4ra00051j.

[3] Nhung Hac Thi, Toan Van Hoang, Truong Cong Doanh, Ho Thi Oanh, Doan Tien Dat, Ha Tran Nguyen, Giang Le-Nhat-Thuy, Quang Vinh Tran, Mai Ha Hoang*, Tuyen Van Nguyen*. Two-step preparation of phosphorus-containing organoclay and its effect on fire-resistant and mechanical properties of the flame-retardant polyethylene composite. Journal of Applied Polymer Science 2024, e55758. doi.org/10.1002/app.55758.

b. Scientific papers published in national journals

[1] Nguyễn Thị Hạnh, Hắc Thị Nhung, Lê Nhật Thuỳ Giang, Hoàng Mai Hà*, Nguyễn Văn Tuyến*. Nghiên cứu tổng hợp nano kẽm borate và đánh giá khả năng chống cháy của tổ hợp nano kẽm borate/phosphor đỏ/graphite giãn nở trên nền nhựa HDPE. Tạp chí Khoa học & Công nghệ Việt Nam – B, 2024, 66, 1B, 56-61. Doi.org: 10.31276/VJST.66(1).56-61.

[2] Trịnh Đức Công, Nguyễn Linh Chi, Nguyễn Hà Thanh, Đặng Thị Tuyết Anh, Bàn Văn Phúc, Hoàng Mai Hà, Trần Quang Vinh, Lê Nhật Thùy Giang, Nguyễn Thị Quỳnh Giang, Nguyễn Văn Tuyến*. Nghiên cứu tổng hợp một số dẫn xuất DOPO ứng dụng chế tạo compozit chống cháy trên nền epoxy. VNU Journal of Science: Natural Sciences and Technology, 2024, 40, 1, 105-115. doi.org/10.25073/2588-1140/vnunst.5605.

[3] Nguyễn Thị Thu Phương, Đoàn Thị Bích Hòa, Ngô Thị Lan, Nguyễn Hà Thanh, Đỗ Thái Anh, Lê Nhật Thùy Giang, Nguyễn Văn Tuyến, Trịnh Thu Hà*. Phân tích chất chống cháy cơ phosphate trong vải bọc nội thất và đánh giá rủi ro tới sức khỏe con người. Tạp chí Khoa học và công nghệ, Đại học Công nghiệp Hà Nội, 2023, 59, 6C, 128-132. 

Patents (list):

[1] Patent name: Derivatives of DOPO and epoxy-based flame retardant composites comprising such derivatives. Application number 1-2023-07845. Decision on accepting valid application No. 3341/QĐ-SHTT.IP dated January 12, 2024.

Technological products (stored  at Institute of Chemistry):

- 24FO fiber optic splice closures: 140 pieces

- Electrical insulation boards: 200 pieces

 Other products (if applicable):

[1] Master Ha Ngoc Linh has successfully defended his thesis and received a master's degree in analytical chemistry. The degree with registration number THS. 00664 was issued by President of Thai Nguyen University of Science on September 11, 2023, recorded in certificate book DTZ/THS/2023/0240. The thesis title is “Analysis of the chemical structure of some flame retardant DOPO compounds using modern analytical methods”.