Synchronously improved toughness and dielectric properties of cyanate ester resins via modification with biobased poly(N-phenylmaleimide-co-limonene),Journal of Polymer Science

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Synchronously improved toughness and dielectric properties of cyanate ester resins via modification with biobased poly(N-phenylmaleimide-co-limonene)
Journal of Polymer Science ( IF 3.9 ) Pub Date : 2024-01-03 , DOI: 10.1002/pol.20230813
Quanbing Shen ₁ , Yan Chen ₁ , Li Wang ₁ , Dong Chen ₁ , Yuhong Ma _{1,

2} , Wantai Yang _{1,

2,

3}

Affiliation

High-performance cyanate ester (CE) resins have attracted intensive interests due to low-k and heat resistant properties. However, the extreme high curing temperature and inherent brittleness severely limit their practical application. Herein, novel biobased poly(N-phenylmaleimide-co-limonene) (PML) microspheres were specially designed and synthesized by self-stabilized precipitation polymerization, which could simultaneously serve as effective curing agents and toughening modifiers for 2,2-bis(4-cyanatophenyl) propane (BADCy). The high density of unreacted endocyclic vinyl groups in PML could effectively react with BADCy, leading to lower curing temperature and good interfacial compatibility. Benefitting from both the weakly polarizable flexible chains and the highly crosslinked semi-interpenetrating network formed during the curing process, BADCy/PML resins exhibited highly enhanced toughness and reduced dielectric constant (ε). Specifically, the BADCy/PML resins showed minimum values of ε and dielectric loss of 2.61 and 0.0032 at 10⁶ Hz, much lower than BADCy resins (2.88, 0.0052). More importantly, a maximum impact strength of 15.6 kJ/m² was achieved at 10 wt% loading of PML, which was 86% higher than BADCy resin. In summary, this work developed a novel strategy to simultaneously improve toughness and dielectric properties of CE resins using bio-based PML copolymer, which have great potential in the fields of electronics and information technology.

中文翻译：

通过生物基聚（N-苯基马来酰亚胺-柠檬烯）改性同时提高氰酸酯树脂的韧性和介电性能

高性能氰酸酯（CE）树脂由于低介电常数和耐热特性而引起了人们的广泛关注。然而，极高的固化温度和固有的脆性严重限制了它们的实际应用。在此，通过自稳定沉淀聚合专门设计和合成了新型生物基聚（N-苯基马来酰亚胺-共聚-柠檬烯）（PML）微球，该微球可以同时作为2,2-双（4-氰基苯基）丙烷（BADCy）。 PML中未反应的环内乙烯基的高密度可以有效地与BADCy反应，从而导致较低的固化温度和良好的界面相容性。受益于弱极化柔性链和固化过程中形成的高度交联的半互穿网络，BADCy/PML树脂表现出高度增强的韧性和降低的介电常数（ε）。具体而言，BADCy/PML 树脂在 10 ⁶ Hz 时显示出 ε 和介电损耗的最小值，分别为 2.61 和 0.0032，远低于 BADCy 树脂（2.88、0.0052）。更重要的是， PML负载量为10 wt%时，最大冲击强度达到15.6 kJ/m ² ，比BADCy树脂高86%。总之，这项工作开发了一种利用生物基PML共聚物同时提高CE树脂韧性和介电性能的新策略，在电子和信息技术领域具有巨大的潜力。

更新日期：2024-01-03

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